Dent Depth Research Articles

An Experimental Study of the Cyclic Compression after Impact Behavior of CFRP Composites

The behavior of impact damaged composite laminates under cyclic load is crucial to achieve a damage tolerant design of composite structures. A sufficient residual strength has to be ensured throughout the entire structural service life. In this study, a set of 27 impacted coupon specimens is subjected to quasi-static and cyclic compression load. After long intervals without detectable damage growth, the specimens fail through the sudden lateral propagation of delamination and fiber kink bands within few load cycles. Ultrasonic inspections were used to reveal the damage size after certain cycle intervals. Through continuous dent depth measurements during the cyclic tests, the evolution of the dent visibility was monitored. These measurements revealed a relaxation of the indentation of up to 90% before ultimate failure occurs. Due to the distinct relaxation and the short growth interval before ultimate failure, this study confirms the no-growth design approach as the preferred method to account for the damage tolerance of stiffened, compression-loaded composite laminates.

Prediction of low‐velocity impact dent for composite laminates based on an anisotropic elastoplastic damage model

AbstractIn this paper, a three‐dimensional finite element (FE) model based on an anisotropic elastoplastic damage model is established to simulate the impact dent of composite laminates subjected to low velocity impact (LVI) by implementing a user‐defined subroutine VUMAT in Abaqus/Explicit. To validate the FE model, numerical results are compared with the experimental data in terms of impact dent depth, contact force‐time response, and projected delamination shape. The simulation shows that considering tension‐compression asymmetry in the elastoplastic constitutive relation has a significant influence on the prediction of dent depth. Besides, it is found that before the knee point, the formation of the impact dent is mainly related to matrix plasticity and damage; while after the knee point, the significant increase of dent depth is caused by fiber breakage on the impact side. The increase of bending stiffness for thicker laminates can decrease the overall deflection, which leads to less fiber breakage and less visible dent.

Ultimate strain capacity assessment of local buckling of pipelines with kinked dents subjected to bending loads

A dent is a typical defect found in oil and gas pipelines and poses a significant threat to their safety and integrity. In this study, the buckling behavior and limit strain capacity of pipelines with kinked dents under bending moment loads were investigated. First, four-point bending tests of full-scale pipelines with kinked dents were conducted in a laboratory, and the critical buckling load and strain response of the pipelines during buckling failure were tested. The test results revealed that the existence of kinked dents, specifically those with large depths, could weaken the bending resistance of the pipelines. During the buckling process of the pipeline, a considerable compressive strain was generated at the bottom center of the dent, which was considerably higher than the strain value at the corresponding position of the intact pipeline. However, the strain at both axial sides of the dent gradually changed from compressive strain at the initial bending stage to tensile strain after buckling failure. Then, nonlinear finite element (FE) models of buckling failure for pipelines with kinked dents under bending moment loads were developed, and the reliability of the FE models was verified through comparison with the test results. In addition, a parametric sensitivity study was conducted to determine the effect of parameters, such as dent depth, dent angle, diameter-to-thickness ratio of the pipe, and yield ratio of the pipe steel, on the compressive strain capacity of the pipeline. Finally, based on a large number of FE simulation results, a model for predicting the buckling compressive strain capacity of pipelines with kinked dents was developed, which can be used for evaluating buckling instability failure of pipelines with kinked dents subjected to bending moment loads.

Crashworthiness index of honeycomb sandwich structures under low-speed oblique impact

It is expected to quantitatively determine the crashworthiness of honeycomb sandwich structures in engineering. However, it is challenging due to diverse cell features, hybrid component materials, as well as varied types of impact load. In this study, two dimensionless indexes (i.e., horizontal dent offset displacement per unit depth ϕ and the ratio of horizontal to vertical energy absorption η) are proposed for sandwich structures based on the mechanical response characteristics (deformation and energy absorption) of sandwich structures under low-speed oblique impact. Unlike conventional crashworthiness indexes such as dent depth, specific energy absorption, damage area, etc., the proposed indexes take into account the influence of impact angle (θ) on the mechanical behavior of sandwich structures. Multiple sets of simulation of honeycomb sandwich structures, including conventional hexagonal honeycombs, honeycomb-filled structures and negative Poisson's ratio structures, obliquely impacted (θ varies from 15° ~ 75°) by a rigid body are performed by using the finite element method, whereby the crashworthiness index values of all the sandwich structures are obtained. The index values (ϕ and η) become smaller as the crashworthiness is enhanced (where the wall thickness of the sandwich structure is thickened from 0.02 ~ 0.1 mm). It manifests that the proposed indexes can capture the crashworthiness of sandwich structures under low-speed oblique impact reasonably well. In addition, the proposed indexes can more clearly distinguish the crashworthiness of sandwich structures of different configurations than conventional indexes. The index values (ϕ and η) show that the oblique crashworthiness of the negative Poisson's ratio structure, hexagonal honeycomb, and honeycomb-filled structure becomes stronger in order.

Strain response analysis of API 5L X80 pipelines with a constrained dent subjected to internal pressure

Constrained dents normally cause serious plastification on the pipe under internal pressure due to the restraint of the indenter. Therefore, in this work, the strain response of the API 5 L X80 (referred to as X80 in the remainder part) steel pipeline containing a constrained dent was investigated. Firstly, the formation process of the constrained dented pipeline was numerically simulated by establishing a 3D finite element (FE) model. The model was then verified against the test results of other researchers. The validated model was employed to investigate the equivalent plastic strain distributions of the constrained dent created during the pipe construction and pipe operation stages. Finally, an extensive parametric study was conducted to examine the effects of the internal pressure, dent depth, diameter-to-thickness ratio, indenter size and shape on the strain response of the constrained dented pipe in detail. The results show that the maximum equivalent strain of shallow dents locates at the pipe inner wall at the dent center. As the dent depth increases, the maximum strain position deviates from the dent center and moves outwards along the pipe circumferential direction. Compared with the constrained dent formed during the pipe construction period, the maximum equivalent strain of the in-service constrained dented pipelines is larger under the identical dent depth. The maximum strain increases significantly as increasing the dent depth and internal pressure. It is noted that the wall thickness has a greater influence on the equivalent plastic strain distributions of the constrained dented pipe than that of the pipe diameter. The equivalent plastic strain caused by a small indenter is more serious than the large one due to the high strain concentration. It is noteworthy that circumferential dent (dent length is less than dent width) can be considered as the most severe form of dent defects on the pipe in comparison to the axial dent (dent length is greater than dent width) and dome dent (dent length is approximately equal to dent width).

Effect of location of crack in dent on burst pressure of pipeline with combined dent and crack defects

Burst pressure of pipelines with longitudinal cracks located at the centre of rectangular dents varies with defect size and recent reports indicate that it could be very high for shallow cracks inside shallow dents and for cracks inside restrained dents. However, it is not clear whether cracks located in the flank of dents would have the same impact on burst pressure of pipelines with dent-crack defects. In addition, studies show that the location of maximum strain in circular dents shifts away from the centre towards the flank when dented pipes are pressurised, but the implication on the propagation of longitudinal cracks located in various parts of a dent has not yet been widely investigated. In this paper, models of pipelines with longitudinal cracks inside rectangular dents were created using the Finite Element Methods software Abaqus to analyse crack propagation and predict the associated burst pressure. The in-built Extended Finite Element procedure in Abaqus was used to model crack propagation through the pipe. The models were calibrated and validated using previously published results of burst tests and tests of material properties. The effect of longitudinal cracks in both the flank and centre of the dents on the burst pressure was analysed by varying the crack length, the crack depth, the dent depth, the internal pressure during dent formation and the dent constraint condition. The results show that longitudinal cracks in the flank of rectangular dents are more severe for pipeline integrity than cracks located in the centre of dents. Crack depth and crack location inside the dents are the most influential parameters when assessing dent-crack defects in pipelines. Their effects on burst pressure are magnified by crack length, dent depth and denting pressure.

An Assessment on a Subsea Pipeline Subject to a Diagonal Trawl Impact

In oil and gas offshore areas, flowlines in fishing waters are at risk of trawl gear impacts. In this regard, DNV-RP-F111 recommends a beam and spring-mass (BSM) model to assess the overtrawlability of pipelines. The BSM model is commonly employed to assess perpendicular trawl impacts on pipelines. However, in the case of a subsea pipeline under a non-perpendicular trawl impact, the BSM model does not incorporate the full diagonal load; the tangential component of the impact load is disregarded. Furthermore, the BSM model does not account for the progression of damage in a pipe (e.g., the plastic damage in a pipe that is imposed by a non-perpendicular trawl impact and is translated along the pipe during the impact). In this regard, a recent study showed that damage progression could decrease the structural resistance of a pipeline. Therefore, as the BSM model does not consider the damage progression effect, it could underestimate the resulting dent depth in a pipe. The present study uses an experimental investigation to examine the damage progression effect in a cylindrical specimen. Furthermore, using a hybrid shell-beam finite element model, an enhanced version of the BSM model, a scenario of a pipe subject to a diagonal impact is investigated. The experimental results show that the dent depth in a 5-inch pipe under a perpendicular 150 kN load could increase by 52%, where the imposed damage is translated for 300 mm along the pipe. In addition, the results obtained from the finite element analyses show that the dent depth in 5-inch and 14-inch pipelines is 20% higher under a full diagonal trawl impact with 30° angle from the pipe normal, compared to applying only the normal component of the diagonal impact. In conclusion, the resulting dent size in a pipe under a diagonal trawl impact is dependent on both normal and tangential components of the impact. Furthermore, the hybrid shell-beam model could be a suitable alternative to the BSM model for scenarios where a pipe is subject to a diagonal trawl impact.

Environmental effects on the strength and impact damage resistance of alumina based oxide/oxide ceramic matrix composites

In this study the effects of high temperature and moisture on the impact damage resistance and mechanical strength of Nextel 610/alumina silicate ceramic matrix composites were experimentally evaluated. Composite laminates were exposed to either a 1050°C isothermal furnace-based environment for 30 consecutive days at 6 h a day, or 95% relative humidity environment for 13 consecutive days at 67°C. Low velocity impact, tensile and short beam strength tests were performed on both ambient and environmentally conditioned laminates and damage was characterized using a combination of non-destructive and destructive techniques. High temperature and humidity environmental exposure adversely affected the impact resistance of the composite laminates. For all the environments, planar internal damage area was greater than the back side dent area, which in turn was greater than the impactor side dent area. Evidence of environmental embrittlement through a stiffer tensile response was noted for the high temperature exposed laminates while the short beam strength tests showed greater propensity for interlaminar shear failure in the moisture exposed laminates. Destructive evaluations exposed larger, more pronounced delaminations in the environmentally conditioned laminates in comparison to the ambient ones. External damage metrics of the impactor side dent depth and area directly influenced the post-impact tensile strength of the laminates while no such trend between internal damage area and residual strength could be ascertained.

Study on strain response of X80 pipeline steel during weld dent deformation

Mechanical damage is one of the main factors affecting the service safety and service life of pipeline steel. The weld will cause cracking failure due to different strain response with different microstructure during deformation. In order to study the response characteristics and mechanism of the weld during deformation, the strain evolution process of the X80 pipeline steel in the weld zone is studied by finite element analysis (FEA) and experimental prefabrication of pipeline dent. The strain hardening model of the weld zone is established, and the dislocation configuration in different regions is discussed. The results show that the maximum strain gradually transfers from the weld to the heat affected zone (HAZ) when the depth of the dent is greater than 3% outer diameter, and the crack is finally generated at this stress concentration zone. The experiment verifies this phenomenon and shows that the established model can effectively evaluate the strain distribution and variation process of the weld zone with dent. It is believed that the microstructure of the weld is mainly fine ferrite with good strength and toughness; the microstructure of the HAZ is mainly bainitic ferrite with M/A islands distributed, which will hinder the movement of dislocations in ferrite under the external load, resulting in dislocation accumulation and stress concentration. As the depth of the dent increases, the density of dislocation at the grain boundary of the weld and the HAZ increases, and the dislocation slips continuously. The typical dislocation cell substructure appears in the HAZ, which reduces the uniform plastic deformation capacity and deformation capacity. Based on the simulation and experiment, it is proposed that the in-service pipeline should be repaired or replaced when the weld dent depth is larger than 3% outer diameter.

Combining eddy current, thermography and laser scanning to characterize low-velocity impact damage in aerospace composite sandwich panels

Aerospace sandwich panels subject to low-velocity impacts can develop damage in both the face sheet and the core that may compromise structural integrity. The standard repair manual for each aircraft specifies allowable damage limits that consider surface dents and the presence of disbonds or delaminations. A strategy for identifying the types of impact damage according to the standard repair manual using a series of non-destructive inspection techniques is presented for honeycomb sandwich panels with composite facesheets and metallic core. Eddy current is first used to identify impact sites, followed by thermography to detect disbonds or delaminations and laser scanning to measure the size of surface dents. Images of damage sites in honeycomb sandwich panels from low-velocity impacts created using a drop tower show that when used together, these inspection methods are able to detect and distinguish between three different damage configurations; core crush, surface dents, and adhesive disbonds or face sheet ply delaminations. While these three methods are commonly used non-destructive evaluation techniques, this paper focuses on their combined use in identifying different types of impact damage in aerospace sandwich panels in-situ according to the requirements of the standard repair manual. The combined methods are shown to address requirements of dent depth, dent area, and the identification of disbonds or delaminations in a more rapid, repeatable and robust manner than is currently employed.

Research on Damage Assessment of Buried Standard and Carbon‐Fibre‐Reinforced Polymer Petroleum Pipeline Subjected to Shallow Buried Blast Loading in Soil

Buried petroleum pipelines may encounter threats from blast loading due to terrorist attacks, accidental explosions, and artificial blasting during in‐progress construction. Carbon‐fibre‐reinforced polymer (CFRP) is often used for the repair and reinforcement of buried petroleum pipelines. It is meaningful and necessary to distinguish the different responses and establish an effective damage assessment method for standard petroleum pipelines and CFRP‐supported petroleum pipelines buried in soil under blast loading. In this study, under fixed end constraints, experimental analysis and numerical simulations were combined to assess the damage of a standard petroleum pipeline and a CFRP petroleum pipeline buried in soil under blast loading. The results showed that, for a scaled distance of 0.19 m/kg1/3, plastic deformation occurred on the surfaces of the two pipelines facing the explosive. The antiexplosion performance of the CFRP pipeline was better than that of the standard pipeline, and the CFRP sheets had a positive effect on the protection of the buried petroleum pipeline during the buried blast loading. Furthermore, based on pressure‐impulse damage theory and with consideration of the feasibility under real circumstances, two pressure‐impulse damage evaluation curves for standard and CFRP pipelines facing explosive loads were established separately based on a new critical ratio of the dent depth and length. Finally, based on the two pressure‐impulse damage evaluation curves and the new critical ratio, two pressure‐impulse damage criteria for these two buried petroleum pipelines were defined. Moreover, with the two pressure‐impulse damage evaluation curves, mathematical formulae for the two different buried petroleum pipelines were established to generate pressure‐impulse diagrams. With the established formulae, the damage to the standard buried pipeline and the CFRP pipeline could be evaluated effectively. Damage to other similar standard pipelines or CFRP pipelines buried in soil with different design parameters due to shallow buried blast loading could also be evaluated using this method.

Full Scale Dent Rebound Testing of X65 Steel Linepipe

Dents in buried pipelines can be formed due to a number of causes: third party machinery strikes, rock strikes during backfilling, pipe resting on rock, and amongst others. Dents in pipelines would not only affect short and/or long-term integrity, but would also have a potential impact on the pass capacity of in-line inspection and cleaning tools when the size of the dent is large enough. Rebound for an originally constrained dent can decrease the dent depth and improve the pass capacity of in-line inspection and cleaning tools. In order to estimate the rebound capacity of dents especially in spiral weld pipelines, a full-scale dent rebound testing program of X65 steel pipeline was designed and performed. The full scale testing was conducted on the parent material and the spiral welds. Hemispherical and pyramidal indenters were used to generate dents to different depths. Strains around the denting area during formation of the dent and changes in depths due to rebounding after removing indenter were measured. Following each rebound test, the dent profile was portrayed with a 3D laser scanner and the maximum equivalent strain was then calculated. With the information obtained from the above measurements, detailed analyses were performed and a numerical model was developed. In this paper, the approach used for the study is described first. The results and findings are then presented. The effectiveness of the developed numerical model for dent integrity management is demonstrated.

Damage Accumulation Model of a Dented Pipeline Subject to Water Hammer Waves

During service, pipelines are likely to have mechanical damage, such as dents that can contribute to local stress concentration and alter the proper functioning of the structure. A dent may cause significant structural damage, especially if the pipeline is subject to water hammer waves. In this article, the investigation of pipes subjected to water hammer waves due to the event of a sudden change in valve status or pump failure is carried out. A numerical damage accumulation model that takes into account the load interaction effect is developed and validated in order to assess the harmfulness of the dent defect. This model uses the pressure peaks induced by the water hammer phenomenon as input. Based on a fatigue life estimation model, taking into account the mean stress effect, the damage is calculated for each loading level. A non-linear interpolation analysis is performed on the results obtained from a finite element model in order to determine the stress concentration factor for any dent depth value, which is used to estimate the fatigue life of the damaged structure. A model is used to take the effect of dent re-rounding into consideration. Then the developed damage accumulation model is used for a parametric analysis. The parameters considered are the dent type (spherical, rectangular longitudinal and rectangular transverse), the dent configuration (constrained and unconstrained), the dent depth, and the fluid inside the pipe. This study will allow the most damaging indentation defect to be concluded, as well as the factors that could make the defect more harmful.

Numerical Investigation of the Damage Mechanism of Offshore Pipeline Impacted by the Lump-Shaped Falling Object

AbstractDamage mechanism analysis of the exposed offshore pipeline impacted by lump-shaped falling objects plays a significant role in offshore pipeline design, inspection, maintenance, and protection. A series of three-dimensional (3D) coupling models are established and simulated to investigate mechanical behaviors and responses of exposed offshore pipelines impacted by lump-shaped falling objects. The effects of both offshore pipeline parameters and lump-shaped falling object parameters were discussed under the joint action of internal pressure and external seawater pressure. The results demonstrate that seabed soil could absorb partial impact energy and act as a cushion. Indentation on the pipeline top and stress concentrations on the pipeline bottom starts to appear when the impact velocity is larger than 10 m/s and 14 m/s, respectively. The critical impact energy before pipeline failure is around 9733.339 J. A variation in contact area has a noticeable influence on the dent depth, but a slight influence on the global deformation. An increase in pressure difference mitigates the impact damage. The depression rate increases with the rise of the radius-thickness ratio, and the most severe plastic deformation occurs when the radius-thickness ratio is 40. Besides, the eccentric distance is an essential factor influencing the damage mechanism of the offshore pipeline.

Erosion Mechanism and Sensitivity Parameter Analysis of an innovative shaped Curved Pipeline

In the process of natural gas transportation, it is unavoidable for particles to collide with the wall, which will cause erosion of curved pipeline. Reasonable curved pipeline structure can effectively avoid the erosion failure. In this paper, an innovative shaped curved pipeline formed by extrusion of cylindrical indenter is presented. The erosion mechanism and sensitivity parameter analysis of the innovative shaped curved pipeline is studied by numerical simulation and compared with that of ordinary elbow. In addition, the effects of extrusion parameters and particle parameters on erosion of innovative shaped curved pipeline were also studied. The results show that the dent can effectively reduce the maximum erosion rate of elbow. With the increase of dent depth, the maximum erosion rate of elbow is decreasing. With the increase of indenter diameter, the ability to reduce the maximum erosion rate decreases. Under the harsh conditions of large particle diameter and high particle velocity, the dent has a better ability to reduce the maximum erosion wear rate, and the maximum erosion rate can be reduced by 26.8%.

Strain ratcheting failure of dented steel submarine pipes under combined internal pressure and asymmetric inelastic cycling

This paper presents the results of an experimental study in which for the first time the progressive inelastic deformation of high strength steel pressurized pipes with plain and gouged dents was analyzed. The effect of some key loading and geometrical parameters such as initial pre-strain (εmon), dent depth ratio (δ/D) and the presence of the gouge was studied. Local dents with a hemispherical shape and gouges with different dimensions were introduced on the surface of the specimens. Specimens with plain or gouged dents were first internally pressurized, axially compressed to an initial pre-strain then subjected to cyclic nonlinear stressing.The mechanical defects were found to drastically degrade the inelastic cyclic response of the pressurized steel pipes. The presence of a dent, even with small amounts of initial pre-strains, made the pressurized pipes vulnerable to ratcheting failure. Furthermore, the ratcheting responses of the gouged dented specimens significantly differed from those for the corresponding specimens with plain dents. In fact, the combination of a dent and gouge was the severest form of the defect and demonstrated the lowest number of cycles before failure. The degradation effects of gouge were strongly dependent upon the gouge geometry, dent depth and initial pre-strain level.

An Assessment on the Overtrawlability of Small Pipe Sizes Using a Hybrid Shell-Beam Model: an Alternative to the DNV-RP-F111 Model

Fishing activity in offshore areas associated with oil and gas development presents a risk to the structural integrity of subsea pipelines from trawl gear interactions. In this regard, DNV-RP-F111 is the industry recommended practice and proposes a beam and spring-mass (BSM) model as well as an analytical method to assess the overtrawlability of pipelines. However, the recommended practice is only applicable for pipelines with an outer diameter of more than 10-inch. Accordingly, the present paper proposes an alternative model (the hybrid shell-beam model) to extend the applicability of the BSM model for small pipe sizes. Furthermore, the BSM, analytical, and hybrid models are examined and compared for a case of 5-inch pipe diameter. Accordingly, for the 5-inch pipe, the resulting dent depth predicted by both the BSM and the hybrid model is very close; however, the BSM model is relatively non-conservative and slightly underestimates the resulting dent depth on the pipe by 6.5%, compared to the hybrid model. Furthermore, using the analytical model leads to a very conservative dent depth on the pipe. In conclusion, the hybrid model is a suitable alternative to the BSM model for small pipe sizes.

Burst pressure of thin-walled pipes with dent and gouge defects

Mechanical interference is the main cause of the failure of thin-walled pipelines in some countries. Gouges and dents are two common types of external interference that threaten the structural integrity of thin-walled pipes. This paper presents an experimental and numerical investigation of the failure pressure and strain history of thin-walled pipes with dent and gouge defects. First, four full-scale burst tests were conducted. Then, a 3D nonlinear finite element model was established, and its accuracy and reliability were validated using the experimental data. On the basis of the experimental and numerical results, the failure pressure of the thin-walled pipes with dent and gouge defects was studied in detail. During the burst process, the variation in axial strain is small, whereas the circumferential strain changes significantly. Test results show that failure location occurred at the flank of dent. Pipe deformation is more prominent for small defects. A parametric study suggests that the failure pressure increases with decreasing dent depth, pipe diameter-to-wall-thickness ratio, and gouge depth and length. The gouge size has the strongest effect on the failure pressure of thin-walled pipes with dent and gouge defects.

Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Mechanical damage in form of dents, cracks, gouges, and scratches are common in pipelines. Sometimes, these damages form in proximity of each other and act as one defect in the pipe wall. The combined defects have been found to be more injurious than individual defects. One of the combined defects in pipeline comprises of a crack in a dent, also known as dent-crack defect. This paper discusses the development of finite element models using extended finite element criterion (XFEM) in Abaqus to predict burst pressure of specimens of API X70 pipeline with restrained and unrestrained concentric dent-crack defects. The models are calibrated and validated using results of full-scale burst tests. The effects of crack length, crack depth, dent depth, and denting pressure on burst pressure are investigated. The results show that restrained dent-crack defects with shallow cracks (depth less than 50% wall thickness) inside dents do not affect pipeline operations at maximum allowable operating pressure if crack lengths are less than 200 mm. Releasing restrained dent-cracks when the pressure is at maximum allowable operating pressure can cause propagation of deep cracks (depth of 50% wall thickness or more) longer than 60 mm. However, only very long cracks (200 mm and higher) propagate to burst the pipe. Cracks of depth less than 20% of wall thickness inside dents formed at zero pressure are not propagated by the maximum allowable operating pressure. Dent-crack defects having dents of depth less than 2% outside diameter of pipe behave as plain cracks if the dents are formed at zero denting pressure but are more injurious than plain cracks if the dents are formed in pressurized pipes.

Modulation of impact energy dissipation in biomimetic helicoidal composites

Biologically composites offer inspiration for the design of next generation structural materials due to their hierarchical microstructure that allows for, low density, and combination of high stiffness and toughness, currently unmatched by engineering technologies. Here, we investigate biomimetic composite materials that feature the laminated helicoidal architecture of fibers characteristic of the arthropod cuticle, specific to the mantis shrimp, but utilize either glass or Kevlar fibers, with epoxy or urethane matrix materials, to examine their role in impact energy dissipation. Drop weight impact test revealed epoxy-matrix composites exhibited the highest peak load on impact and showed larger degrees of external damage such as delamination and fiber breakage as compared to the urethane-based composites. Moreover, the helicoidal panels, showed a significant reduction in dent depth and better residual compressive strength as compared to the quasi-isotropic design. These findings provide useful insight into the variation of reinforcement and matrix materials for the helicoidal architecture and how it affects the delocalization of damage and improves residual strength.