Article
Mechanics
Farhad Teimouri, Mohammad Heidari-Rarani, Farhad Haji Aboutalebi
Summary: In this study, VCCT and XFEM are combined to simulate fatigue delamination growth, comparing force and displacement control methods for accuracy. Challenges and advantages of VCCT and XFEM-VCCT approaches are discussed, with XFEM-VCCT showing high accuracy and low computational time.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Pawan Sharma, Harlal Singh Mali, Anurag Dixit
Summary: In this research, a Mode-I interlaminar fracture modeling of a double cantilever beam (DCB) composite laminate was conducted using various fracture modeling techniques such as virtual crack closure technique (VCCT), cohesive zone modeling (CZM), and extended finite element method (XFEM). The comparison of the results with experimental data showed that the three-dimensional XFEM-CZM technique had excellent accuracy and moderate mesh dependency in predicting crack behavior.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2023)
Article
Nuclear Science & Technology
Zihao Yu, Jun Zhang, Jie Shen, Hongniao Chen
Summary: Numerical simulations were conducted on nuclear graphite fracture performance using XFEM, CZM and VCCT in ABAQUS. The study showed that the peak load P-c is sensitive to mesh size, with VCCT being the most sensitive method. By validating the finite element model with experimental results, appropriate parameters for fracture simulation were proposed, leading to successful analysis of crack length.
NUCLEAR MATERIALS AND ENERGY
(2021)
Article
Chemistry, Physical
Jakub Rzeczkowski, Sylwester Samborski
Summary: This paper presents experimental and numerical research on the delamination process in carbon/epoxy composite laminates with different fiber orientation angles in stacking sequence exhibiting bending-twisting elastic couplings. The results reveal that extensive fiber bridging phenomenon significantly affects the propagation values of strain energy release rate and numerically obtained load-displacement curves during the delamination process. Despite this, the numerical outcomes using the virtual crack closure technique are in agreement with experimental data in the initial stage of delamination, demonstrating the effectiveness of this technique. The greatest mode I fracture toughness value of 0.56 N/mm was obtained for the BT45 laminate.
Article
Mechanics
F. Teimouri, M. Heidari-Rarani, F. Haji Aboutalebi
Summary: In this study, the fatigue damage models by Turon et al. and Kawashita-Hallett are extended with a trilinear cohesive law to simulate mode I fatigue delamination in composites with large-scale fiber bridging. The trilinear CZMs are found to be more accurate than bilinear CZMs in predicting fatigue delamination with fiber bridging effects, as validated by finite element analyses and experimental data comparisons. Additionally, a parametric study was conducted to investigate the sensitivity of the extended models to fitting parameters and quasi-static CZM parameters.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Vikash Kumar, Hukum Chand Dewangan, Nitin Sharma, Subrata Kumar Panda
Summary: This research predicts the influences of combined damage and thermomechanical loading on the modal values and strain energy release rate of the curved shell panel using computational and experimental methods.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Claudia Barile, Caterina Casavola, Giovanni Pappalettera, Vimalathithan Paramsamy Kannan
Summary: In this research, acoustic emission results from carbon fibre reinforced plastic laminates were analysed using k-means++ algorithm for clustering descriptors, with a method introduced for predicting crack length. The study also validated experimental results using analytical and finite element models.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2021)
Article
Engineering, Civil
Michal Smolnicki, Szymon Duda, Pawel Zielonka, Pawel Stabla, Grzegorz Lesiuk, Cristiane Caroline Campos Lopes
Summary: In this paper, the fracture properties of pultruded GFRP bars are investigated using the double cantilever beam test (DCB) under mode I loading. Due to the presence of the R-curve effect, a nonstandard approach is introduced to determine fracture properties. A mixed experimental-numerical approach is proposed, with numerical simulations carried out in Simulia Abaqus and Python scripting used to generate models and obtain R-curve for the material. The agreement between the numerical model and experimental results allows its use in analyzing more complex structures. Introducing acoustic emission analysis as an auxiliary technique, the delamination observed in both the numerical model and experiment correlates with registered acoustic emission events. The proposed method can be applied to prepare material models for other composite materials displaying the R-curve effect.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Mechanics
Angela Russo, Aniello Riccio, Andrea Sellitto
Summary: Interlaminar damage evolution is a key interest in composite materials research. A robust numerical finite element procedure for simulating fatigue driven delamination growth was proposed in this study, showing load step and element size insensitivity in nonlinear incremental analyses. The method was validated at coupon level and applied to a composite stiffened panel, demonstrating accuracy and potential for realistic fatigue test cases.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Marine
Ranfeng Wei, Kechun Shen, Guang Pan
Summary: This paper investigates the delamination damage and the effect of buckling behavior on delamination propagation of a composite cylindrical shell subjected to hydrostatic pressure. The numerical model of the composite shell with initial delamination and geometric imperfection is elaborated using the finite element method. The impact of initial delamination shape, depth, and ply orientation on ultimate pressure and delamination propagation path is studied through a parametric analysis. The results show that buckling behavior promotes delamination propagation and the axial initial delamination length has a significant influence on the ultimate buckling pressure of the shell.
Article
Engineering, Mechanical
S. Sai Kumar, N. Muthu
Summary: In this study, a modified element-free Galerkin (EFG) method combining Heaviside enrichment and diffraction method is used to analyze crack propagation problems. The cohesive zone model (CZM) with an exponential traction separation law (TSL) is employed, and the generalized displacement control method (GDCM) is adopted to solve nonlinearity during damage evolution. The proposed methodology is validated through various test cases and shows good agreement with experimental/reference results.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Article
Mechanics
Weiling Liu, Puhui Chen
Summary: This paper focuses on the importance of fiber bridging in composite materials and its impact on fracture toughness. An efficient method is provided to identify the fiber bridging phenomenon, and its feasibility is validated experimentally.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Amit Patel, Eiichi Sato, Naohiro Shichijo, Ichiro Hirata, Takeshi Takagi
Summary: This research work focuses on simulating different fracture modes in the high-stress concentrated region of SiC/SiC CMC components at the macroscopic scale, considering the increasing cost and time of experimental tests. XFEM and CZM are used to predict mode-I and mode-II fracture behavior, respectively. The results show that the first crack initiation and propagation are dependent on XFEM damage criteria, and delamination occurs at the damage-front CE layers. The simulated force-displacement relationships match well with experimental results, indicating that XFEM with CZM methodology can be a reliable method for predicting fracture behavior in complex-shaped SiC/SiC CMC components in the near future.
COMPOSITES PART C: OPEN ACCESS
(2022)
Article
Engineering, Civil
Mehdi Ganjiani, Majid Safarabadi, Nabi Mehri-Khansari, Hossein Oruji
Summary: This study examines the effect of mode II delamination and corresponding interlaminar crack propagation in multilayered glass/polyester composites during the drilling process, using numerical and experimental approaches. Results show that more than 95% of crack propagation can be attributed to mode II.
FRONTIERS OF STRUCTURAL AND CIVIL ENGINEERING
(2021)
Article
Engineering, Mechanical
Vikash Kumar, Hukum Chand Dewangan, Nitin Sharma, Subrata Kumar Panda
Summary: This research numerically studied the influences of combined damage on a layered structure using a finite element technique. The influences of delamination and/or crack on the modal responses and strain energy release rate were considered. The accuracy of the model was proven by comparing the results with previously published data, and the validity of the model was certified through comparisons with experimental eigenvalues. The effects of delamination and/or crack on composite shell structures were assessed by altering the input variables.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Majid Emadi, Hamid Beheshti, Mohammad Heidari-Rarani
Summary: The study highlights the importance of lightweight and energy-absorbing materials in occupant safety during accidents, with numerical simulation and multi-objective optimization showing that composite tubes perform better in peak load and energy absorption compared to aluminum tubes. It is also found that annealing treatment can significantly reduce the objective functions in ductile aluminum alloys.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2021)
Article
Materials Science, Composites
M. Heidari-Rarani, N. Ezati, P. Sadeghi, M. R. Badrossamay
Summary: Fused deposition modeling (FDM) is a common method for additive manufacturing of polymers, which is capable of producing complex parts quickly. This study examines the effect of three important process parameters - infill density, printing speed, and layer thickness - on the tensile properties of polylactic acid (PLA) specimens. The optimal parameters for maximum mechanical properties, minimum weight, and minimum printing time are determined using the Taguchi design of experiment method. The accuracy of the Taguchi method in predicting the mechanical properties of FDM-3D printed specimens is also assessed.
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
(2022)
Article
Mechanics
Ahmad Reza Ghasemi, Mohammad Heidari-Rarani, Bijan Heidari-Sheibani, Ali Tabatabaeian
Summary: A new closed-form solution for transverse free vibration analysis of laminated composite beams with arbitrary number of concentrated masses is developed. The governing equations are solved semianalytically, frequency equation and mode shapes are extracted for two different boundary conditions. The study investigates the effects of mass, as well as location and number of concentrated masses on the free vibration response of the beam.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Mechanics
Kobye Bodjona, Sean Fielding, Mohammad Heidari-Rarani, Larry Lessard
Summary: The compliance of the adhesive layer has an impact on the strength of single-lap hybrid bonded-bolted joints. For joints with low compliance adhesive, adding a fastener does not provide benefits, while for joints with high compliance adhesive, adding a fastener significantly delays the initial failure. A proposed mechanism, supported by a numerical model, explains the observed behavior.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
F. Teimouri, M. Heidari-Rarani, F. Haji Aboutalebi
Summary: In this study, the fatigue damage models by Turon et al. and Kawashita-Hallett are extended with a trilinear cohesive law to simulate mode I fatigue delamination in composites with large-scale fiber bridging. The trilinear CZMs are found to be more accurate than bilinear CZMs in predicting fatigue delamination with fiber bridging effects, as validated by finite element analyses and experimental data comparisons. Additionally, a parametric study was conducted to investigate the sensitivity of the extended models to fitting parameters and quasi-static CZM parameters.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Farhad Teimouri, Mohammad Heidari-Rarani, Farhad Haji Aboutalebi
Summary: In this study, VCCT and XFEM are combined to simulate fatigue delamination growth, comparing force and displacement control methods for accuracy. Challenges and advantages of VCCT and XFEM-VCCT approaches are discussed, with XFEM-VCCT showing high accuracy and low computational time.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Mohammad Hossein Zamani, Mohammad Heidari-Rarani, Keivan Torabi
Summary: A novel angle graded auxetic honeycomb (AGAH) core with varying cell angles and constant wall thickness along the gradation has been designed. New analytical relations were proposed to predict the equivalent elastic properties of the core, which enhances specific stiffness and natural frequencies of sandwich structures. Analytical and finite element analyses were conducted to assess the core performance and investigate its impact on the vibration response of sandwich panels.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Engineering, Mechanical
Mohsen Ahmadi Jebeli, Mohammad Heidari-Rarani
Summary: The study focused on the simulation and research of the two main challenges in the design of type IV composite pressure vessels, demonstrating a good correlation between numerical simulations and experimental results.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Mechanical
Vahid Pourriahi, Mohammad Heidari-Rarani, Amir Torabpour Isfahani
Summary: The study presents analytical formulations for predicting the equivalent elastic properties of hexagonal aluminum honeycomb including all geometric parameters. Experimental results show good agreement between high-fidelity and low-fidelity models. The influence of various geometric parameters on the natural frequencies of sandwich beams is also investigated.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
Jianxia Wang, Tianliang Qin, Narasimha Rao Mekala, Yujun Li, Mohammad Heidari-Rarani, Kai-Uwe Schroeder
Summary: A three-dimensional progressive damage model for composite bolted joints under tensile loading was developed and validated. The model considered significant damage phenomena and showed high accuracy in predicting inflection load, failure load, load-displacement response, and failure modes. The study revealed that matrix cracking is the dominant failure mode in these joints.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Saeid Karimi, Farhad Haji Aboutalebi, Mohammad Heidari-Rarani
Summary: The present study aims to evaluate and improve the remeshing-free fatigue crack growth simulation and life estimation through the development of two algorithms, FEM-VCCT and XFEMPN-VCCT, in Abaqus. A new adaptive VCCT algorithm is introduced to enhance the accuracy of FCG simulation and life estimation.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Engineering, Chemical
Ali Sadeghi, Rasoul Mahshid, Mohammad Heidari-Rarani, Larry Lessard
Summary: This study investigates the influence of various parameters on the strength and failure mode of bonded composite-to-composite single-lap joints. The results show that the fiber angle has a significant effect on the shear and peel stresses in the adhesive layer. Experimental and numerical findings demonstrate that the failure of composite joints is greatly influenced by shear stress.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Materials Science, Composites
Mohammad Danesh, Hamid Beheshti, Mohammad Heidari-Rarani
Summary: The main challenge in the design of radar-absorbing composite structures is the variety of parameters affecting the absorbing performance. This study investigates the impact of different parameters, including reinforcing materials, geometric parameters, and manufacturing methods, on the radar-absorbing feature of composite structures.
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
(2023)
Article
Materials Science, Multidisciplinary
Ramin Jahadi, Hamid Beheshti, Mohammad Heidari-Rarani
Summary: This study proposes a novel micromechanics-based damage model to analyze the damage evolution of a two-component microencapsulated-based self-healing polymer composite. By implementing cohesive elements with a bilinear traction-separation law, the progressive damage of the epoxy matrix, PMMA shell, and capsule-matrix interfaces is investigated. The effects of interface bonding strength, fracture energy, and PMMA microcapsules volume fraction on the load-carrying capacity of the composite are studied. The results show that increasing interfacial strength and fracture energy leads to improved tensile strength, while a higher volume fraction of PMMA microcapsules decreases the load-carrying capacity.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Ramin Jahadi, Hamid Beheshti, Mohammad Heidari-Rarani, Amir H. Navarchian
Summary: This study investigated the effect of agitation speed on the morphology and particle size of epoxy/PMMA microcapsules, showing that the average diameter increased with higher mixing rates. The chemical structure of epoxy and hardener PMMA capsules was analyzed, and the reinforcing role of microcapsules in polymer composite materials was explored. The experimental results demonstrated a slight increase in tensile strength of the self-healing polymer composite with 1 wt.% PMMA microcapsules prepared at 1000 rpm, followed by a decrease with higher concentrations and larger sizes of PMMA microcapsules.
SMART STRUCTURES AND SYSTEMS
(2021)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
