Fracture Envelope Research Articles

Artificial neural network enhanced plasticity modeling and ductile fracture characterization of grade-1 commercial pure titanium

This study primarily aims to develop a robust modeling approach to capture the complex material behavior of CP-Ti, appeared by high anisotropy, differential hardening due to anisotropy evolution, and flow behavior sensitive to strain rate and temperature, using artificial neural networks (ANNs). Plasticity is characterized by uniaxial tension and in-plane biaxial tension tests at temperatures of 0 °C and 20 °C with strain rates of 0.001 /s and 0.01 /s, and the results are used to calibrate the non-quadratic anisotropic Yld2000–3d yield function with respect to the plastic work. In order to predict the intricate plastic deformation with the temperature and strain rate effects, two distinct ANN models are developed; one to capture the strain hardening behavior and the other to predict the anisotropic parameters in the chosen yield function. The developed ANN models predict an unseen dataset well, which is intermediate testing conditions at a temperature of 10 °C and strain rate of 0.005 /s. The ANN models, being computationally stable and adhering to conventional constitutive equations, are implemented into a user material subroutine for the ductile fracture characterization of CP-Ti sheet using the hybrid experimental-numerical analysis. The favorable agreement between experimental data and numerical predictions, particularly using the ANN models with evolving anisotropic material parameters for the Yld2000–3d yield function, underscores the significance of the differential hardening effect on the ductile fracture behavior and highlights the capabilities of ANN models to capture the complex plastic behavior of CP-Ti. The key parameters including stress triaxiality, Lode angle parameter, and equivalent plastic strain at the fracture location are extracted from the simulations, enabling the calibration of ductile fracture models, namely Johnson-Cook, Hosford-Coulomb, and Lou-2014, and construction of fracture envelopes.

Effect of high temperature on the mixed mode I-II fracture characteristics of hot-dry rock

To investigate the variation law of rock fracture characteristics with temperature in hot-dry reservoirs, the pure mode I, pure mode II and mixed mode I-II loading experiments were carried out on sandstone and granite at room temperature and after high-temperature (100 °C, 300 °C, 500 °C and 700 °C) treatment by using the central cracked Brazilian disk (CCBD) specimen. The changes of parameters such as failure load, fracture toughness and fracture envelope with temperature were discussed, and the changes of rock mineral composition and fracture surface morphology were analyzed by X-ray diffractometer (XRD) and scanning electron microscope (SEM), respectively. The results showed that the influence of temperature on the fracture characteristics of sandstone and granite presents different evolution laws.With the increase of temperature, the failure modes of sandstone and granite all change from brittle failure to ductile failure, but the critical temperature of the transition is different. Granite shows obvious ductile failure characteristics at 500 °C, while sandstone shows slight ductile failure characteristics at 500 °C.The failure load and fracture toughness of sandstone increase first and then decrease with the increase of temperature, which indicates that within a certain range, the temperature has a toughening effect on sandstone, and can improve its failure resistance. However, the failure load and fracture toughness of granite always decrease with the increase of temperature, which indicates that the temperature only has a deteriorating effect on granite. In the range of 100 °C to 500 °C, the temperature enhances (sandstone) or weakens (granite) the mode I fracture toughness of rocks more than it enhances or weakens the mode II fracture toughness. However, when the temperature is 700 °C, the temperature weakens the mode II fracture toughness more than the mode I fracture toughness. The area enclosed by the fracture envelope of sandstone first increases and then decreases with the increase of temperature, while the area enclosed by the fracture envelope of granite decreases with the increase of temperature. As the temperature increases, the tortuosity of the crack paths in sandstone and granite increases, the cross-section morphology becomes rougher, and the internal fissures and fragmentation increase.

Dual-actuator mixed-mode bending tests on structural adhesive joints

In this article, a novel mixed-mode bending (MMB) test setup is presented and used to investigate the fracture behavior of the structural adhesive SikaPower®-498. The novelty lies in the implementation of two actuators that can be controlled independently of each other. This opens up investigation possibilities that go beyond those of the MMB standard configuration. For example, a varying mode-mixity can be prescribed during testing, allowing identification of an entire fracture envelope from a single experiment. Additionally, an optical fiber strain measurement (OFS) system is used to determine the curvatures of the substrates, allowing for a detection of the actual crack tip position and an analysis of the loading conditions behind the crack tip. The presented work focuses on the experimental calibration of the compliance change during crack growth, on tests performed at constant (external) mode-mixity using a mode partitioning approach based on the J-integral, as well as on tests carried out under varying mode-mixity. Additional aspects of the test setup such as stable crack growth regime or differences between the results of different evaluation methods are discussed. Finally, the obtained fracture envelopes are compared with references from literature, including for the first time a comparison between mixed-modes I+II and I+III.

Anisotropic ductile fracture of a stainless steel under biaxial loading: Experiments and predictions

The anisotropic ductile fracture behavior of a stainless steel is investigated using a combination of experiments and analysis. The material is SS-304L, an austenitic, low-carbon stainless steel, received in the form of tubes of 2.38 mm dia. and 0.15 mm thickness. The tubes are inflated under volume control in a custom apparatus. At the same time, the axial force on the tubes is kept proportional to the pressure induced by the inflation. This leads to quasi-proportional stress paths in the meridional-hoop engineering stress space. A total of 15 discrete paths are successfully tested. Stereo-type Digital Image Correlation is used to measure the strains. In every case, the tubes develop a series of instabilities before bursting. The failure is oriented along the meridional or the hoop direction of the tube, depending on which stress is greater. A mild plastic anisotropy is detected in these experiments. Hence these results are then used for calibrating the anisotropic yield criterion Yld2004-3D. This is introduced in a finite element model of the experiments, which includes a thickness imperfection designed to capture the two failure orientations observed in the experiments. The numerical model using the Yld2004-3D criterion reproduces the experiments well, e.g., it captures the experimental stress-strain and induced strain paths better than von Mises. It is then used to probe the conditions at the onset of fracture (hybrid method). It is found that most paths lead to essentially proportional loading during deformation. A significant anisotropy in the fracture behavior is detected, with the meridional-stress-dominated paths being able to develop much higher strains than the hoop-dominated ones. These results are then captured by the DF2016 ductile fracture criterion, modified to use the anisotropic yield criterion Yld91. The proposed criterion is flexible enough to represent the fracture anisotropy very well, without being unnecessarily complex. The fracture forming limit curve (i.e., the fracture envelope in strain space) predicted by the DF2016/Yld91 model is also found to be very close to the experiments. The results and findings of this work help establish a framework to reliably design components and processes when significant fracture anisotropy is expected.

Thermal treatment effects on rock fracture behaviour under three loading modes: A comparative analysis of granite and mudstone

Temperature and thermal damage have a major impact on the behaviour of fractures in the earth’s crust. For deep earth engineering such as underground coal gasification, geothermal energy extraction, and nuclear waste repositories, developing fracture criteria governing the propagation of fractures under thermal effect is crucial. As a result, the ability of stress, energy, and strain-based fracture criteria to predict rock fracture behavior both before and after thermal treatment is assessed in this paper considering two rock types; granite, and mudstone, which are very different from one another in terms of their mineralogical composition and mechanical properties. The overall findings showed that the energy-based criterion was more effective in predicting fracture parameters both before and after thermal treatment than the stress and strain-based criteria. Specifically, after thermal treatment at 500 °C for the granite, and at any temperature for the mudstone, the strain-based criterion was no longer valid. It was found that the temperature and loading mode have a significant impact on the granite’s transition from brittle to ductile, where this transition can occur at an approximated temperature of 460 °C. Meanwhile, an increase in brittleness with rising temperature was noted in mudstone. Moreover, the Fracture Process Zone (FPZ) size was predicted by the energy-based criterion to be greater than that predicted by stress and strain-based criteria. It was found that the FPZ size is proportional to the brittleness degree of the two rock types, which is considerably impacted by thermal treatment. In addition, this study discusses several critical areas in rock fracture mechanics in the presence of thermal effects including fracture envelopes under mixed mode loading I/II, fracture stress, and initial crack extension angle. All of these are of high importance in assessing the safety and stability of rock structures in the presence of thermal effects.

On the mixed mode fracture of DLP manufactured SCB specimens

The scope of this study is to investigate the mixed mode fracture of components manufactured from photo-polymerized resin using the Digital Light Processing (DLP) additive manufacturing technology.The mixed mode tests were performed on Semi Circular Bend (SCB) specimens loaded under symmetric Mode I, asymmetric mixed mode and mode II loading, respectively. The specimens manufactured via DLP have a crack introduced during the manufacturing process. Tests were performed at room temperature using a universal testing machine with three point bending grips at a constant loading speed. Four tests were carried on for each supports position.The experimental results expressed as KII/KIC versus KI/KIC are plotted by adopting four fracture criteria, namely the Maximum Tensile Stress (MTS), the Strain Energy Density (SED), the Maximum Energy Release Rate (Gmax), and the Equivalent Stress Intensity Factor (ESIF). Most of the experimental results fall in the range of fracture envelope curves.

Experimental analysis on the mixed-mode fracture behavior of structural adhesives

The wide use of adhesive joints supposes that accurate strength predictions methods exist for design. Cohesive zone models (CZM) consist of the most accepted method, although the fracture toughness (GC) of the adhesive in the different loading modes should be firstly characterized, and the mixed-mode behavior or fracture envelope known. This work experimentally evaluates the cracked-lap shear (CLS) test for mixed-mode GC assessment of two epoxy adhesives. Different theoretical reduction methods were evaluated. The work consisted of testing CLS specimens with the different adhesives, and carrying out the respective data processing. Results showed that the model of Brussat et al. led to offset results compared to the other methods.

Using cohesive zone models with digital image correlation to obtain a mixed mode I/II fracture envelope of a tough epoxy

This work describes a method in which the digital image correlation (DIC) method and finite element analysis (FEA) were used to create a quasi-static mixed-mode fracture envelope for bonded joints consisting of 2024-T3 Al adherends and a tough structural epoxy adhesive. Symmetric and asymmetric versions of double cantilever beam, single-leg bend, and end-notched flexure tests are used to populate the mixed-mode fracture envelope with results at several mode mixities. Experiments are conducted in a universal testing machine while recording images for subsequent DIC analysis. Finite element analysis is used to implement cohesive zone models (CZMs) of the adhesive fracture and to account for plastic deformation of adherends. Mode I and mode II traction separation laws (TSLs) are determined from a property identification method with a Benzeggagh–Kenane mixed-mode coupling law used to model mixed-mode behavior. FEA results are shown to provide a good agreement to both the crosshead displacement and DIC data. The methods in this paper serve as a potential framework for future calibration of mixed-mode fracture envelopes for joints bonded with very tough adhesives that complicate assessment with traditional data analysis methods.

Fracture properties evaluation of structural adhesives using the dual actuator test frame and digital image correlation technique

ABSTRACT This paper implements a dual actuator testing protocol to evaluate the fracture behavior of a toughened epoxy adhesive under mode I and mixed mode I+II loading conditions. Digital image correlation is used to monitor crack propagation and assess adherend and adhesive deformations. A good repeatability between the test results is observed for both failure modes (I and I+II). The constitutive law is obtained by evaluating the J-integral while measuring the crack tip opening displacement. Different mixed mode test strategies are developed in this work. First, an actuator load control protocol is implemented so as to propagate the crack under constant mixed mode I+II ratio and evaluate the fracture envelope of the studied adhesive, which turns out to be adequately described by the Gong-Benzeggagh failure criterion. A second strategy is proposed with a variable mixed mode ratio during the experiment for faster investigation. Using this technique, stable fracture energy values are recorded along the crack propagation path, thus leading to very fast and accurate results.

Fracture toughness of colored slurry seal at low temperatures and different loading Modes: Comparative study with warm and hot mix asphalt materials

Sustainable pavement, including colored slurry seal, was treated by crack growth under different traffic loads and temperatures. The current research examined colored slurry seals’ fracture toughness at various temperatures under mixed modes I/II and I/III. Three-point bend fixtures were used to prepare edge-notched disk bend (ENDB) disk specimens with edge cracks along one side of the specimens. Then, different temperatures and complete range mode mixity, including I/II and I/III, were used to determine fracture toughness data as well as the critical stress-intensity factor. Results indicated that the samples’ fracture resistance initially declined followed by an increment by an increment in the shear load in I/II mixed mode. From pure mode I to III, colored mixture resistances decreased with crack growth by raising mode III fraction at the crack tip. Moreover, lower temperatures led to better fracture performance between mixtures, especially at −20 °C. Mixtures’ fracture performance was positively influenced by temperature reduction due to bitumen strength characteristics. Comparison of fracture envelopes of cold mix asphalts (CMAs) in I/II and I/III mode mixities with other types of asphalt concrete, such as warm and hot mix asphalt (WMA and HMA), showed higher susceptibility of CMA mixture to cracking failure mode, making it noticeably weaker than WMA and HMA mixtures.

Mixed-mode fracture study of Mode-I + III and II + III loading conditions in AA7085 using a new fixture

This study experimentally examines the onset of fast fracture and crack deflection in AA 7085 for both mode-I + III and mode-II + III fracture modes. A new loading device has been developed by modifying the Richards loading device to induce out-of-plane mode in addition to mode-I and mode-II loading. The specimens assembled with the loading device were loaded using a uniaxial testing machine. Specimen level boundary conditions were derived to determine the fracture parameters at the onset of fracture using XFEM. The deflection angle of the crack and the fracture envelope were compared against standard criteria to predict failure.

On the mixed mode I/II translaminar fracture of plain-weave carbon, E-glass and Kevlar reinforced laminated composites

The main aim of this study is to investigate the influence of long fiber types on the translaminar fracture behvior of epoxy-based composites subjected to pure mode I, mixed mode I/II and pure mode II using a combined experimental study and finite element (FE) analysis. Compact tension shear (CTS) test configuration was used to determine the critical strain energy release rate (CSERR) of the laminated composites reinforced with three types of high-performance fibers: Carbon, E-glass and Kevlar fiber. We believe that this is the first published report on the full combination of mode I, mixed mode I/II and mode II translaminar fracture toughness of laminated composites reinforced by three types of fiber. The translaminar fracture envelopes of the tested materials were illustrated. The results revealed that the translaminar CSERR of the composite systems is strongly dependent on the reinforcement type and the loading condition. The mode I translaminar CSERR of E-glass, Carbon and Kevlar fiber reinforced composites are equal to 16.87, 13.52, and 18.29 kJ/m2, respectively. Besides, under mode II loading condition, the translaminar CSERR of the laminated composites reinforced by E-glass, Carbon and Kevlar is obtained as 15.21, 7.82, and 8.45 kJ/m2, respectively. Fractographic analysis manifested that fiber pull-out clustering, fiber splitting, fiber breakage and matrix cracking are the main energy dissipating mechanisms happened on the fracture surface of the laminated composites.

The impact of sterilization, body environment condition and raster orientation on tensile-shear cracking of sub-sized 3D printed specimens

Use of 3D printed parts in biomedical applications has received attention recently. The applied loads, manufacturing pre-processing factors or in vivo conditions may affect the reliability and integrity of such implants. To obtain deeper understand regarding the cracking resistance and microstructure of extrusion-based 3D printed acrylonitrile butadiene styrene (ABS) material a number of sub-sized and short bend beam samples are manufactured. The influence of raster orientation, Gamma radiation sterilization, body environment (saline 0.9% at temperature of 37 °C) and combined Sterilized process & body environment was studied on the mixed-mode I + II fracture toughness and strain energy release rate values. It was observed that exposing the 3D printed ABS material to Gamma-radiation process can increase noticeably the mixed mode fracture resistance compared to the control sample. Printing pattern with raster orientation of ±45° provided a higher mixed-mode fracture envelope compared to pattern of 0/90° for all investigated environments. The microstructure study of SEM pictures obtained from the investigated samples showed dominantly ductile type fracture with some evidences such as formation of dimples and ridge markings. The depth and number of ridge markings and dimples were increased by moving towards mode II (shear mode loading) and for the samples exposed to body environment.

Loading rate effects on mixed-mode I/II fracture envelope of epoxy resins with nonlinear behavior

The tangential stress contour (TSC) method in combination with the equivalent material concept (EMC) was used to predict the fracture load, fracture initiation angle, and fracture resistance of an epoxy resin with nonlinear and ductile behavior. In this analysis, both the loading rate and mode mixing effects were taken into account to obtain the fracture envelopes of the tested resin. Based on the considered approach, only a tensile test performed on dogbone specimens and a pure Mode I fracture toughness test using semi-circular bend (SCB) samples are required to predict the ultimate load and crack initiation angle of the resin at different mode mixities. According to this technique, the non-linear ductile behavior of the tested epoxy is simulated by a virtual brittle linear response, which greatly simplifies the problem. The predicted fracture envelope was validated by experimental results. A very good agreement between the prediction and the experimental data was obtained.

Weibull multiscale interlaminar fracture analysis of low-weight percentage CNT composites

Delamination due to interlaminar fracture has limited the application of composite materials in highly integrity-sensitive structural systems. The novelty of this experimental and statistical investigation is twofold: (i) the effects of the size of multi-wall carbon nanotube (MWCNT) bundles and their interphase with the surrounding matrix on the multimodal fracture toughness and crack propagation regime; (ii) the effectiveness of single lamina vs. multiple laminas on fracture toughness in carbon fiber nanocomposites. The Atomic Force Microscopy Peak Force Quantitative Nanomechanics Mapping (AFM PFQNM) technique was utilized to characterize the CNT bundle size and interphase. Weibull analysis of a myriad of 480 CNT bundle sizes and interphases confirmed a high scatter in the data with more occurrences at the larger size. Two different nanocomposite laminates were considered: (i) laminates with 1wt% CNT in all laminas (FCNT); (ii) laminates with 1wt% CNT in the middle layer in front of the pre-crack (CNT). The average size of the CNT bundles and the interphase thickness were 549.7 nm and 22.9 nm in the CNT laminates and 480.1 nm and 22.2 nm in the FCNT laminates. The ratio of interphase thickness to CNT bundle size was higher in FCNT than in CNT, confirming a better stiffening effect due to the nano reinforcement of FCNT laminates. Weibull moduli of mode I initiation and propagation and mode II initiation for laminates with CNT in all laminas, FCNT, are higher than reference and CNT laminates, confirming a higher crack energy consistency. The Mode I initiation and propagation and mode II initiation fracture energies of CNT and FCNT were (15% and 10%), (38% and 44%), and (1.7% and 9.6%) higher than those without CNT. Mixing 1wt% CNT with all laminas expanded the mixed-mode I-II fracture envelope function by 21%. Unlike FCNT laminates, CNT laminates do not considerably improve the mixed-mode I-II fracture toughness. Crack deflection and a more arduous crack path due to the rigid CNT bundles increased the crack energy and delayed the crack propagation.

Mixed-mode I/II fracture performances of glued laminated bamboo in the in-plane longitudinal direction

Considering that glued laminated bamboo components usually fail because of the longitudinal cracks under combined tensile/shear loading, mixed-mode I/II fracture tests were conducted on two kinds of glued laminated bamboo boards in the in-plane longitudinal direction by Arcan test method: laminated bamboo lumber (LBL) with thick-layer unidirectional-arranged bamboo strips and glued laminated bamboo (glubam) with thin-layer bidirectional-arranged bamboo strips. on the basis of Wu criterion for mixed mode fracture of wood, the mixed-mode I/II fracture envelops of LBL and glubam are constructed by curve fittings on the calculated fracture toughness components and the pure mode-I and mode-II fracture toughness. The results show that the small quantity of transverse bamboo fibers change the fracture mode in the in-plane longitudinal direction from short and quick matrix-dominated brittle failure of LBL specimens into long and slow fiber and matrix-dominated quasi-ductile failure of glubam specimens. In response to the in-plane longitudinal crack, only 1:4 of transverse fibers to longitudinal fibers can provide about 6 times of the pure mode-I fracture toughness, 1.4 times of the pure mode-II fracture toughness and more than 6.5 times of the area within the mixed-mode I/II fracture envelope.

Mixed-mode dynamic fracture parameters for soda-lime glass

Dynamic mixed-mode fracture of soda-lime glass (SLG) was experimentally investigated using a full-field optical method - Digital Gradient Sensing (DGS) - in conjunction with ultrahigh-speed photography. Single edge-notched specimens were subjected to reverse impact loading using a modified Hopkinson pressure bar. The specimens were eccentrically loaded at different offset distances relative to the initial notch to achieve a wide range of mode-mixities, from mode-I to nearly mode-II condition, at initiation. Two time-resolved orthogonal angular deflection fields of light rays proportional to the respective full-field stress gradients were optically measured during experiments on different geometries. Mode-I and -II stress intensity factor histories spanning pre- and post-initiation behaviors were evaluated via over-deterministic least-squares error minimization of optically measured full-field data. By considering the critical stress intensity factors at different crack initiation modes, a fracture envelope for SLG encompassing various mode-mixities was developed for the first time for SLG and compared with predictions from prevailing approaches. An empirical fit of data seems to capture the overall trend whereas the prevailing methods do not. Measured crack kink angles are compared with the popular MTS and SED fracture criteria; both predict the kink angles reasonably well. Unlike brittle polymers, the critical effective stress intensity factors for SLG are independent of mode-mixity over a large range of values but show a decreasing trend as mode-II conditions become dominant and an extrapolated critical mode-II stress intensity factor of 0.37 MPa√m, approx. one-half of its mode-I counterpart, is seen.

Mixed-mode fracture of compacted tailing soils. I: Fracture toughness

Mine tailings are man-made soils and leftovers from the mineral processing that share the similar geotechnical properties with natural soils. In areas with abundant mineral reserves and developed mining industries, tailings could be utilized as an alternative of natural soils for subgrade materials of pavement and adobes for building and construction constructions. The tailing soils are also the based materials for tailing dams. The compacted tailing soils might thus be subject to combined opening or shearing deformations that were unexplored in the current academic society. In this paper, a test configuration called asymmetric semi-circular bending (ASCB) was adopted to investigate the mixed I/II mode fracture properties of the compacted tailing soils. First, the load–displacement relationships of the SCB specimens for different notch depths and span ratios were presented. The mode I and II fracture toughness components were then calculated by referring to the theoretical solutions derived from classical fracture mechanics. The fracture envelope from mode I and II fracture toughness components were presented. Meanwhile, the mixity parameter was introduced to evaluate the mode mixity of the ASCB specimens. Finally, the crack initiation angles of the SCB specimens were measured through experimental tests and compared to the theoretical results obtained from generalized maximum tangential stress criterion (GMTS). Results show that the mode I fracture toughness component of the compacted tailing soils increased with the span ratio, while the mode II fracture toughness component increased with the decrease of span ratio. The mode mixity and crack initiation angles of the SCB specimens under mixed mode loading conditions increased with the decrease of span ratio.

Comprehensive investigation of rock fracture behaviour in clay-rich rocks under the effect of temperature: Experimental study under three loading modes (I, I/II, II)

Rock fracture behaviour is a crucial aspect in many geological and engineering projects and can be affected by different environmental factors such as temperature, especially in projects where the rocks are exposed to a change in temperature such as geothermal energy, oil and gas exploitation, nuclear waste areas, etc. Therefore, this research aims to investigate the effect of temperature on rock fracture behaviour under four loading modes; pure mode I, pure mode II, and two mixed-mode loadings I/II in SCB specimens of clay-rich rocks (mudstone). Thirty-six SCB specimens were prepared and tested under three temperatures (Ambient temperature (AT), 250 and 500 °C), and some important parameters such as fracture toughness, fracture envelope, crack propagation speed, and crack acceleration were measured and discussed as a function of temperature. The main results concluded that due to the gradual loss of water from the structure of high clay content in the mudstone during thermal treatment, the behavior of mudstone gradually changed from ductile to brittle behaviour, and as a result, fracture toughness and crack propagation speed increased significantly. In addition, our results showed that the area under the fracture envelope which represents fracture resistance to growth under mixed-mode loading increased by 1.86 and 2.68 orders in magnitude after thermal treatment at temperatures of 250 and 500 °C, respectively. Under the four loading mode mixities, fracture grows through three main stages, high acceleration (0–5 mm), high deceleration (5–10 mm), and low deceleration (10–15 mm) stages. Crack propagation speed and crack acceleration depend strongly on the mode mixity ratio (KII/KI) and it increased by changing the loading mode from pure mode I to mixed mode loading I/II and pure mode II.

Mixed-mode dynamic fracture behavior of a rubber toughened epoxy adhesive under stress wave loading

This work seeks to measure mixed-mode fracture parameters for a dynamically growing crack in a core shell rubber toughened epoxy adhesive (EPONTM 828 with PARALOID™ EXL-2691J particles). Digital image correlation technique coupled with ultrahigh-speed photography and a hybrid finite element-based post-processing approach are used to extract fracture parameters. The dynamic loading is accomplished by using a striker to induce stress waves in an incident bar in contact with a free-standing semi-circular specimen. A companion finite element analysis is performed for investigating suitable experimental parameters and configurations for implementing the approach and determining specific experimental parameters (crack length, crack angle, and impact velocity) necessary to achieve the desired experimental conditions (mode mixity at crack initiation and strain rate). The critical fracture parameters are used to generate mixed mode fracture envelope and fracture toughness-mode mixity relationship for the material. Further investigation is carried out to evaluate various fracture criteria for predicting initial crack kink angles. The measured dynamic fracture quantities are also compared with the quasi-static counterparts to assess strain rate-dependence of the adhesive. The results reveal a decrease in critical stress intensity factors of approximately 10 % and 30 % for the mode I and mode II states, respectively, with increasing strain rate. Post-initiation, the dynamic crack propagates at a near-constant mode I stress intensity factor of ∼1.4 MPa-√m. Under dynamic conditions, the critical, effective stress intensity factors are relatively constant with respect to mode mixity. This is in contrast to quasi-static results where the effective values increased with respect to mode mixity. Experimentally measured crack kink angles agree well with those predicted by the maximum energy release rate criteria and the maximum tangential stress criteria, particularly under mode I dominant conditions.