Plastic Analysis Research Articles

Cause Analysis of Low Tensile Plasticity in Normal Direction for Hot‐Rolled Thick Plate of HSLA Steel

To investigate the cause for the low tensile plasticity in normal direction of high‐strength low‐alloy steel thick plate, tensile fracture observation, inclusion statistic, and microstructure observation of thick plate and solidification structure observation of continuous casting slab are carried out. The experimental results reveal that many MnS inclusions are only distributed on the platform of the tensile fracture and they only appear in the center of thick plate together with martensite and severe macrosegregation of elements C and Mn. It is concluded that the aggregated large‐sized MnS inclusions are the direct cause for reducing the tensile plasticity. Stress concentration on a single MnS inclusion during tensile testing can occur and cause a limited brittle fracture area. Aggregation of MnS inclusions creates a large brittle fracture area, which significantly reduces the tensile plasticity. The root cause of the aggregation of MnS inclusions is the well‐developed columnar crystals of continuous casting slab. The well‐developed columnar crystals push high concentration of solutes into the residual liquid‐phase zone in the center of continuous casting slab and create severe central macrosegregation which eventually lead to the appearance of aggregated large‐sized MnS inclusions with martensite in the center of thick plate.

Trans-scale elastic–plastic damage analysis of 3D tubular braided composites with void defects

Three-dimensional (3D) tubular braided composites exhibit irreversible plastic deformation and nonlinear behavior due to the void defects and plastic effects of the matrix. Therefore, this paper establishes an elastic–plastic damage constitutive model of 3D tubular braided composites with defects, which is coupled with plastic effects and damage accumulation. Firstly, 3D tubular braided composite models with defects are established by sequential trans-scale analysis method to transfer the mechanical properties of the component materials. Then, according to the brittleness of the fiber or yarn and the plasticity of the matrix, the elastic and elastic–plastic damage model of the fiber and the matrix are established, respectively. On this basis, an interface element is established to characterize the mechanical properties of the interface with the tractor-separation constitutive model. Finally, the finite element results of the axial compression properties of 3D tubular braided composites coupled with the porosity and plasticity of the matrix, the longitudinal shear nonlinearity of the yarn and the bilinear constitutive relationship of the interface are in good agreement with the experimental results.

Complementary research on the Al–Cu nanostructured composite processed by ARB: finite element, crystal plasticity, intermetallic, and failure analysis

A unique Al–Cu composite was manufactured using the accumulative roll bonding (ARB) process. For characterization purposes, a variety of methods was conducted on the resulting composite. Also, the shear band formation which is a prevalent phenomenon in the ARBed materials was analyzed using the finite element method (FEM). For experimental analysis, the crystallographic texture was evaluated for the material by the X-ray diffraction method (XRD). A well-developed rolling (β-fiber) texture was dominated on the Al side, however, recrystallization led to the occurrence of other component mainly around <001> orientation on the Cu side. Upon annealing, the formation of different intermetallic compounds (IMCs) was observed and evaluated using scanning electron microscopy (SEM). An unexpected AlCu4 was detected between the layers as the prominent IMC after the annealing process. Furthermore, the shear punch test was employed for the material's mechanical characterization. It was observed that the strength of the composite material was higher than that of primary metals i.e., Al and Cu. Finally, failure analysis revealed a ductile fracture with separated layers at earlier cycles and a brittle fracture at higher ARB cycles.

Efficient Method for Calculating Slope Failure Risk Based on Element Failure Probability

The finite element method (FEM) and the limit equilibrium method (LEM) are commonly used for calculating slope failure risk. However, the FEM needs to carry out post-processing to estimate slope sliding surface, while the LEM requires assumption of the shape and location of the sliding surface in advance. In this paper, an element failure risk method (EFR) for calculating soil slope failure risk is proposed based on element failure probability (EFP) acquired by plastic limit analysis. The proposed method does not require any assumptions about failure modes. Firstly, the non-common-node triangle element is used to discrete the slope then the random field is generated based on the Cholesky decomposition midpoint method. According to the reliability stochastic programming model and solution strategy, the external overload coefficient, bulk overload coefficient, slope stability coefficient and velocity field of the slope under each random field are obtained, according to which the failure of the element is judged and the failure risk of the slope is calculated. In order to verify the correctness of the proposed method, two classical slopes are systematically analyzed. The research shows that compared with the traditional slope failure risk analysis method, the greatest advantage of the proposed method is that it can capture all failure modes of the slope and greatly simplify the calculation of the slope failure consequences of each failure mode. An efficient upper bound method (UBM) parallel program is prepared, which greatly improves the calculation efficiency.

Previous successes and untapped potential of pyrolysis-GC/MS for the analysis of plastic pollution.

There is growing concern from scientists, policy makers, and the public about the contamination of natural and indoor environments with plastics, particularly micro/nanoplastics. Typically, characterizing microplastics in environmental samples requires extensive sample processing to isolate particles, followed by spectroscopic methodologies to identify particle polymer composition. Spectroscopic techniques are limited in their ability to provide polymer mass or advanced chemical composition (e.g., chemical additive content), which are important for toxicological assessments. To achieve mass fraction quantification and chemical characterization of plastics in environmental samples, many researchers have turned to thermoanalytical spectrometric approaches, particularly pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Sample preparation for Py-GC/MS may be approached similarly to techniques needed for spectroscopic approaches (e.g., isolate particles on a filter), employ pressurized solvent extraction, or use ultrafiltration techniques to concentrate nanoplastics. Great strides have been made in using calibration curves to quantify plastics in complex matrices. However, the approaches to the pyrolysis thermal program, as well as calibrant and sample preparation, are inconsistent, requiring refinement and harmonization. This review provides a critical synthesis of previous Py-GC/MS work and highlights opportunities for novel and improved Py-GC/MS analysis of plastics in the future.

Qualitative and quantitative studies of plasticizers in extra virgin olive oil by surface-enhanced Raman spectroscopy combined with chemometrics

Plasticizers are widely used as significant adjuvants in the plastics processing industry and have received widespread attention from the international community because of their reproductive toxicity. This study used a combination of surface-enhanced Raman spectroscopy (SERS) technology and chemometrics to conduct qualitative and quantitative analyses of plasticizers in extra virgin olive oil (EVOO). Among three established classification models, namely, partial least squares discriminant analysis (PLS-DA), k-nearest neighbours (KNN), and support vector machine (SVM), SVM was found to be the best classification model, with a correct classification rate (CCR) of 100 %. For the plasticizer concentration prediction model established by partial least squares (PLS), the absolute coefficient Rp2 was higher than 0.97, the root mean square error of prediction (RMSEP) was less than 3.632, and the ratio of performance to deviation (RPD) values were all greater than 5. Furthermore, the proposed method was validated by a standard gas chromatography-mass spectrometry (GC-MS) method using t-test with no significant difference. These results indicate that SERS combined with chemometrics can achieve the identification and quantification of plasticizers in EVOO and has application value for the analysis of plasticizers in edible oils.

On the thermodynamic consistency of the Drucker–Prager Cap model: Modification of the plastic potential and analysis of unloading

The Drucker–Prager Cap (DPC) model is widely used to simulate powder compaction, especially in the pharmaceutical field. However, it has long been recognized that the model may predict an excessive dilation during unloading, most notably for small values of cohesion and/or friction angle. In this article, it is shown that this phenomenon is related to an inherent inconsistency between the yield surface and the commonly used plastic potential. As a result, thermodynamically inconsistent results may be obtained for some parameter values. A modified plastic potential is proposed that guarantees thermodynamic consistency. Uniaxial unloading of a homogeneous tablet in a die with constant cross section and negligible friction is considered so that the elastoplastic equations admit exact closed-form analytical solutions. Hence, exact expressions for the dependence of the axial and radial pressure on tablet height during unloading are obtained. These can be used to analyse experimental unloading data.

Development of a reversible top-hat forming approach for reducing flange wrinkling in flexible roll forming

Flexible roll forming (FRF) addresses the need for flexible manufacturing and light-weighting in electric vehicle production, but its widespread implementation is prevented by severe wrinkling in the flange. Wrinkling in sheet metal forming depends on the tool support and material deformation. In FRF the tool effects on wrinkling are complex, given that the sheet undergoes unsupported deformation when it enters and exits the forming roll and there is no fundamental understanding of material deformation in the critical forming regions where wrinkling occurs. This prevents an effective tool and process design. This work develops a new model to analyse the stability of the flange by combining plastic bifurcation analysis with thin-shell assumptions. The model defines a stress ratio parameter that can be used to determine when in the process, deformation becomes unstable considering the tool support conditions and material deformation. Based on this a new approach for wrinkling reduction is developed that includes the forming and bending back of a top-hat shape to provide additional flange stiffness when wrinkling is likely to initiate. The top-hat shape is optimised using a series of linear perturbation ‘buckle’ analyses to provide the highest possible stiffness increase in the flange. This is followed by experimental manufacturing trials to test and prove the new concept for wrinkling reduction and to validate the model. It is shown that the new top-hat forming approach can eliminate wrinkling in the flange even when flexible roll forming Ultra High Strength Steels. The analytical model results suggest that this is due to the stiffening effect of the top-hat and the reduction of the effective flange length which decreases the stress ratio. The new model in combination with the new forming approach to eliminate flange wrinkling represents a vital step towards a more effective process and tool design that will enable the widespread application of FRF in automotive manufacturing.

Evaluation of the adaptive properties of potato varieties (Solanum tuberosum L.) according to the main economic and valuable characteristics

Purpose. To carry out an analysis of the ecological plasticity and stability of the characteristics of productivity, starch content, dry matter and to determine the parameters of ecological adaptability of potato varieties based on the characteristic “yield” in the soil-climatic zones of the Forest-Steppe and Polissia. Methods. The following methods were used in the research: laboratory, computational and statistical; to draw conclusions – analysis and synthesis. Results. The results of the analysis of potato varieties grown in different soil and climatic zones of Ukraine in terms of yield, starch and dry matter content are given. Promising varieties for selection and practical use with high indicators of adaptability, stability and plasticity were identified. It was found that the highest productivity results were obtained for the variety ‘RANOMI’ in the Forest-Steppe and Polissia zones – 34.6; 28.2 t/ha and high adaptability potential – 1.28; 1.27. The varieties ‘RANOMI’, ‘Cherie’ performed best in the Forest-Steppe zone with yields of 34.6 and 31.4 t/ha, in Polissia conditions – the varieties ‘RANOMI’, ‘PARADISO’ – 28.2 and 27.4 t/ha. The varieties with high plasticity were distinguished by starch and dry matter content (‘7 FOUR 7’, ‘PARADISO’, ‘FONTANE’, ‘RANOMI’, ‘LAUDINE’), productivity (‘7 FOUR 7’, ‘Rodriga’, ‘ALOUETTE’, ‘PARADISO’, ‘LAUDINE’). The varieties ‘Mysteriia’, ‘7 FOUR 7’, ‘LAUDINE’, ‘FONTANE’ and ‘LAUDINE’ proved to be very stable in terms of productivity and the varieties ‘Mysteriia’, ‘7 FOUR 7’, ‘Rodriga’, ‘PARADISO’, ‘RANOMI’ in terms of dry matter and starch content. The varieties with the highest productivity were ‘Rodriga’, ‘PARADISO’, and for dry matter and starch content – ‘FONTANE’, ‘LAUDINE’. Conclusions. In different soil and climatic zones, highly plastic varieties were selected according to yield index – ‘7 FOUR 7’, ‘Rodriga’, ‘ALOUETTE’, ‘PARADISO’, ‘LAUDINE’, according to starch and dry matter content – varieties ‘7 FOR 7’, ‘PARADISO’, ‘FONTANE’, ‘RANOMI’, ‘LAUDINE’. It was found that on average for 2019–2020 the highest productivity and high adaptive potential in the Forest-Steppe and Polissia zones had the variety ‘RANOMI’ – 34.6; 28.2 t/ha, respectively, CA – 1.28; 1.27. In the Forest-Steppe zone it is worth mentioning the varieties ‘Cherie’, ‘Rodriga’ with average CA index 1.15; 1.12 and productivity – 31.4; 30.62 t/ha, in the Polissia zone – ‘PARADISO’, ‘Rodriga’ with CA value – 1.20; 1.11 and productivity – 27.4; 25.5 t/ha.

Elastic–plastic bifurcation analysis of cylindrical shells with axisymmetric variable thickness

This study focuses on the elastic–plastic bifurcation analysis of axial compressed thin-walled cylindrical shells with variable thickness. The general asymptotic formula of the elastic–plastic critical buckling load, which is a function of the Coefficient of the Thickness Variation (CTV) and the buckling load of shells with constant thickness, is derived based on the hybrid perturbation-weighted residual method. The general formula can be reduced to the classical elastic buckling solution in Koiter (1994) when considering the elastic case with the first-order term. Furthermore, a finite element bifurcation analysis procedure is also presented by adopting the incremental J2 deformation theory of plasticity through a custom user-defined subroutine appended to the nonlinear finite element software ABAQUS. The robustness of this numerical scheme and the theoretical formula is confirmed by the decent agreement with the available experimental results in the literature. In the end, the influence of the thickness variation parameter and D/t on the elastic–plastic buckling load of shells with varying thickness is also discussed.

Tensile behaviour of transverse reinforcement with different connection methods in single steel-plate concrete composite structures

Transverse reinforcement is key to the single steel-plate concrete composite (SSC) structure when subjected to out-of-plane shear and impact load. This research focuses on the tensile behaviour of two connection methods between transverse reinforcement and steel plate in SSC structure, namely the tie bar interlocked with the J-hook connector (TBIJC) and the tie bar overlapped with the headed stud (TBOHS), which are much more convenient in construction compared to direct welding connection. Pull-out tests are carried out on 10 groups of specimens with different detail parameters to verify their reliable performance. Various types of failure modes and corresponding experimental phenomena are observed and recorded. The interfacial slip between the tie bar and concrete was measured to reflect the load–deflection characteristics. Parametric studies are carried out on the tensile performance considering connector shape and dimensions, end-anchor form of the tie bar and concrete strength. Plastic limit analysis is performed based on twin shear strength criterion for concrete, and an analytical model is developed to predict the ultimate tensile resistance. The accuracy of the proposed model is validated against the test results. Finally, based on the test results, design suggestions are proposed for the tie bar connection details considering both mechanical performance and construction efficiency.

Simplified calculation model for offshore wind tower founded on monopile member

The objective of the study, concerning the soil-structure interaction of monopile foundations of wind towers consituted by steel tube with hollow cross-sections, was to determine the structural response of wind tower considering the interaction with the foundation. The study was based on elastic and plastic analyses of monopile foundation. The moment-rotation curves of the soil-foundation complex were determined, to be used in verification of the ultimate and operating limit states. The influence of foundation characteristics and type of soil was considered in the calculus of first frequency and critical length. Finally, an experimental validation of the proposed model was made with the data available from the literature in terms of both first frequency and moment rotation response.

A comparative analysis of continuum plasticity, viscoplasticity and phase-field models for earthquake sequence modeling

This paper discusses continuum models for simulating earthquake sequences on faults governed by rate-and-state dependent friction. Through detailed numerical analysis of a conventional strike-slip fault, new observations regarding the use of various continuum earthquake models are presented. We update a recently proposed plasticity-based model using a consistently linearized formulation, show its agreement with discrete fault models for fault thicknesses of hundreds of meters, and demonstrate mesh objectivity for slip-related variables. To obtain a fully regularized fault width description with an internal length scale, we study the performance and mesh convergence of a plasticity-based model complemented by a Kelvin viscosity term and the phase-field approach to cohesive fracture. The Kelvin viscoplasticity-based model can introduce an internal length scale and a mesh-objective response. However, on grid sizes down to meters, this only holds for very high Kelvin viscosities that inhibit seismic slip rates, which renders this approach impractical for simulating earthquake sequences. On the other hand, our phase-field implementation for earthquake sequences provides a numerically robust framework that agrees with a discrete reference solution, is mesh objective, and reaches seismic slip rates. The model, unsurprisingly, requires highly refined grids around the fault zones to reproduce results close to a discrete model. Following this line, the effect of an internal length scale parameter on the phase-field predictions and mesh convergence are discussed.

Shock-induced plasticity and resultant defect analysis in a vacuum kinetic sprayed silver film

High velocity particle impact generates a shock wave that penetrates the material, resulting in severe plasticity and damage. Finite element method simulation demonstrates that Ag particle momentarily undergoes severe deformation with a high strain rate because of stress fluctuation in the material during the shock wave passage. High-resolution transmission electron microscopy analysis reveals that the lattice was severely distorted, flow-like bent with many geometrically necessary dislocations and stacking faults, twinned at the nanoscale, and collapsed into amorphous state.

Crystal plasticity analysis of fatigue-creep behavior at cooling holes in single crystal Nickel based gas turbine blade components

We build a crystal plasticity finite element framework to investigate slip localisation and fatigue-creep behaviour at the cooling holes of single crystal Nickel (Ni) based components under cyclic thermomechanical loading. The total slip rate is decomposed into a thermally activated dislocation glide rate which dominates at moderate/low temperatures (T) and/or high stresses, and a climb rate which dominates at high temperatures and increases as inelastic strain accumulates. This formulation captures the monotonic and long-term creep response of Ni alloys in the wide range 20 <T < 1100 °C and indicates that room temperature plasticity during unloading increases the high temperature creep rate during loading (creep dwell), eventually increasing the total slip accumulation per cycle; the effect depends on the way the inelastic strain accumulates upon successive slip reversals. Elastic material anisotropy is shown to modify drastically the stress concentration around holes such that slip tends to localise at locations where the max principal stress, tangent to the hole surface, aligns with stiff crystallographic directions. This highlights the importance of plastic and creep anisotropy and creates new avenues for optimising hole shape to minimise slip activity. Our study brings to light key material-component relationships that concern the wider material science, high temperature and fatigue communities.

Plastic pollution in the deep-sea Giant red shrimp, Aristaeomorpha foliacea, in the Eastern Ionian Sea; an alarm point on stock and human health safety

Plastic litter, including microplastics, is an ever-growing threat adversely affecting a variety of marine organisms; however, their known effects on marine organisms are still lacking. Aristaeomorpha foliacea is a valuable commercial deep-sea species in the Mediterranean Sea. Hence, due to its importance to human consumption, the investigation of plastic impact on these animals is vitally necessary. In this study the occurrence of ingested plastics has been studied in the giant red shrimp for the first time in the eastern Ionian Sea, as well as any possible differences regarding the plastic ingestion per sex, size, year and its relation to shrimp's health condition. A total of 621 individuals were collected from the Essential Habitat of this species in the eastern Ionian Sea. Plastics were contained in the stomachs of 14.65 % of the examined individuals, with an average of 2.97 ± 0.3 items per stomach. The occurrence of plastics was higher in males than in females. The ingested plastics detected were exclusively fibers of different sizes, colors, and shapes (single form or tangled balls). Plastic items size ranged from 0.75 to 110.59 mm. Significant differences in the occurrence of plastic in the stomachs of A. foliacea were found among years, stations and sex, whereas no considerable effect on shrimp's health condition factors was found. The chemical analysis of plastics showed that 83.82 % of fibers were polyester (PET). Among the shrimps with ingested plastics, the immature individuals were predominant (85.18 %). The results of this study aspire to increase the knowledge on plastics ingestion in the Mediterranean, and highlight the various factors that may be involved in this process. This study demonstrates the obvious threats of plastics in commonly edible shrimps and emphasizes the role of this decapod at the trophic chain by transferring plastics to humans.

Biomethane Potential in Anaerobic Biodegradation of Commercial Bioplastic Materials

Bioplastics have emerged as a promising alternative to conventional plastics, marketed as environmentally friendly and sustainable materials. They provide a variety of methods for efficient waste management contributing to the goals of the circular economy. At their end-of-life stage, bioplastics can generate added value through aerobic and anaerobic biological treatments (composting or anaerobic digestion). In this study, biomethane potential (BMP) tests were carried out under mesophilic conditions on eight different catering biodegradable plastics available in the market and certified as being biodegradable under industrial composting conditions. Chemical analysis of the biodegradable plastics included elemental analysis, Fourier-transform infrared spectroscopy, and inductively coupled plasma–optical emission spectrometry. Key differences were observed in total solids (TS) and volatile solids (VS) contents between the studied biopolymer products. TS values ranged between 85.00 ± 0.26% (Product 8) and 99.16 ± 0.23% (Product 4), whereas VS content ranged between 64.57 ± 0.25 %wm (Product 6) and 99.14 ± 0.17 %wm (Product 4). Elemental analysis (elements C, H, N, S, and O) was used to estimate the theoretical methane production (ThBMP) of each product. The highest ThBMP (538.6 ± 8.7 NmL/gVS) was observed in Product 4 correlated with the highest C and H contents, while the lowest ThBMP (431.8 ± 6.1 NmL/gVS) was observed in Product 2. Significant differences were recorded between BMP values according to the chemical composition of the polymers. The average of BMP values ranged between 50.4 ± 2.1 NmL/gVS and 437.5 ± 1.0 NmL/gVS. Despite being characterized by the same composition (cellulose/cellulose derivatives and calcium carbonate), Products 2, 3, and 6 revealed significant differences in terms of TS, VS, ThBMP, and BMP. Furthermore, a significant statistical relationship (p &lt; 0.001) was found between time (days) and BMP values of the eight products (R2 = 0.899–0.964) during the initial phase. The study confirmed that cellulose-based materials can convert efficiently under mesophilic conditions into methane, at a relatively short retention time; hence, they can be regarded as a promising material for co-digestion with feedstock in industrial anaerobic biogas plants. In contrast, biodegradation of polylactic acids (PLA) does not occur under mesophilic conditions, and hence, pre-treatment of the polymers is recommended. Moreover, PLA-containing products are highly affected by the presence of other components (e.g., polybutylene adipate terephthalate and cellulose/cellulose derivatives).

The Funeral Rite of the Russians of the Omsk Irtysh Region on a Boundary of the Epochs (1870s – 1920s) and Pottery as an Element of Its Structure

Purpose. The main elements of the structure of the funeral rite of the late 19th – early 20th centuries are analyzed based on the materials of the necropolis Yevgashino IV. That necropolis date to 1870–1920 by archaeology materials. The purpose of the study is to identify the main elements of the structure of the Russian funeral rite in the Omsk Irtysh region.Results. The place and features of the burials, the funerary clothing were analyzed in the course of the study. A systematic analysis of the collection of funerary pottery was also carried out. The collection of funerary pottery includes 79 archaeologically intact vessels. Various types of funeral pottery were determined by the method of V. F. Gening. There is also an analysis of the cult copper plastics, such as pectoral crosses, copper diptych. The collection of crosses obtained on the site reflects the process of transition from the “Old Believers” forms of cult casting to stamped products of generally low quality which is an important chronological marker.Conclusion. The results of the research will allow make a chronological scale of Russian funeral rite in the second half of the 19th – early 20th centuries from the time of the arrival of Russians in the region to the present.

Analysis on displacement‐based seismic design method of recycled aggregate concrete‐filled square steel tube frame structures

AbstractRecycled aggregate concrete‐filled square steel tube (S‐RACFST) frame has the characteristics of high bearing capacity, good ductility, and superior seismic performance. To propose a displacement‐based seismic design of S‐RACFST frame, the validity of the design method was verified by a detailed calculation example. Based on the performance requirements, this design method divided the structural performance into five levels: normal use, temporary use, use after strengthening, life safety, and collapse prevention, and suggested specific steps for the displacement‐based seismic design of S‐RACFST frame using the inter‐story displacement angle limit value as the quantitative indicator. The 10‐story S‐RACFST frame was used as an analytical example for static elastic–plastic analysis. The pushover lateral displacement curves of the frame structure at each performance level were obtained and compared with the displacement‐based seismic design curves. The results show that the displacement‐based seismic design method of S‐RACFST frame structures can fulfill the performance level requirements such as “temporary use,” “normal use,” and “collapse prevention,” and the displacement‐based seismic design method is one of the effective ways to realize the performance design of S‐RACFST frame structures.

Isogeometric analysis based investigation on material filling of coin cavities

The coining technology produces a wide variety of commemorative coins with exquisite patterns. However, it often encounters defects such as insufficient filling, flash lines, light bands, and so on. Process engineers usually perform multiple tryouts to avoid the above-mentioned problems in actual production. This is not only time-consuming and laborious but also ineffective. The virtual tryout of the finite element method (FEM) could assist engineers to avoid the defects in the coining process with a great improvement in product quality. In order to exactly describe complex patterns of commemorative coins, a large number of elements are employed in the classical FEM. Even then, the three dimensional elements, which come in early contact with the reliefs of the punch/die, undergo large deformation and become distorted. Errors of contact judgment between the tools and the workpiece in the FEM occur during the simulation process. Taking into account the advantage of Non-Uniform Rational B-Spline (NURBS) basis functions when accurately describing complex boundaries or surfaces, isogeometric analysis (IGA) is developed for studying the material filling of coin cavities. Six numerical examples involving elastic and plastic analyses with/without contact issues are considered by the presented IGA frameworks and show good performance of the present method in simulating the cavity filling compared with ABAQUS. In addition, numerical findings also indicate that the proposed method exhibits excellent contact detection and strong anti-mesh distortion in large deformation of the coining process. These encouraging observations motivate us to explore the NURBS description of complicated reliefs of coins and the corresponding IGA framework for the coining process.