Article
Engineering, Mechanical
Mahdi Fakoor, Zahra Khaji
Summary: Theoretical predictions using conventional fracture criteria are inconsistent with experimental data mainly due to the inaccurate prediction of the crack initiation angle and the neglect of the T-stress term. In this study, a comprehensive investigation on the fracture assessment of orthotropic materials is carried out based on various criteria that consider the mixed-mode loading conditions and the influence of the T-stress term on the crack initiation angle. The results indicate that the T-stress term has a significant impact on the crack initiation angle and fracture assessment of orthotropic materials.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Qingcheng Wang, Liyun Yang, Yuh J. Chao, Renshu Yang
Summary: This paper investigates the hooked or butterfly-shaped phenomenon commonly observed in rock excavation and mining projects using an effective model. The study analyzes the propensity of forming the hook pattern combination with dynamic fracture criterion, and examines the crack deflection angles and propagation paths under variable model parameters. The results show that crack velocities lead to gradual increase in crack deflection angles regardless of plane states, Poisson's ratios, or model heights. Model height has a significant effect on crack deflection, with lower model heights resulting in larger deflection angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Nawres J. Al-Ramahi, Roberts Joffe, Janis Varna
Summary: An alternative method based on maximum hoop stress analysis is demonstrated for predicting crack propagation direction in the adhesive layer of bonded stiff materials, avoiding the need for extensive computational resources. Validation is done using fracture mechanics approach, followed by a parametric study on factors influencing crack propagation.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Mechanical
Xin Lv
Summary: In classical fracture mechanics theory, it is believed that crack surface is open under tension and closed under compression. However, under small angle uniaxial tension, the stress field at crack tip is small because the crack surface may also be closed. This paper considers both the far-field stress and the possible stress acting on the crack surface, and derives the stress field at crack tip. The crack initiation angles of open or closed cracks under uniaxial tension or compression are studied based on the generalized maximum tangential stress criterion.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
W. J. Yuan, Y. J. Xie, H. Yuan
Summary: The present investigation reveals that six energy-based driving forces act on the six subintervals around a crack tip under mixed Mode-I/II loading, controlling fracture configurations including complex crack branching. An efficient method for identifying the driving forces and determining the number of subintervals is proposed. Experimental findings are consistent with the theoretical predictions, providing valuable insights into crack branching under mixed Mode-I/II loading.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
J. Chen, Y. W. Wang, R. Y. Zheng, X. F. Li
Summary: The couple-stress elasticity theory is used to analyze an anti-plane shear crack at the interface between two dissimilar elastic materials. The deviatoric couple stress tensor, governing equation, and boundary conditions are derived. The singularity index is determined using the eigenfunction expansion method, and then the Fourier transform is employed to convert the crack problem to a hypersingular integral equation. The resulting equation is numerically solved using the Chebyshev series method to evaluate various factors and reveal the influence of different parameters.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Yuezhi Zhou, Hongyan Liu
Summary: In geotechnical engineering, the compression-shear fracture mechanism of fissured rock with blunt crack tip and fissured water is complex. Therefore, a comprehensive study on the stress distribution at the crack tip and the initiation criterion for open cracks under hydrostatic and confining pressure has been conducted. The stress intensity factor KI under compression has been studied and a revised maximum tangential stress (MTS) criterion has been proposed. The effect of curvature radius ρ and half-length a on KI and the initiation angle θ has been discussed. Additionally, a model for open cracks filled with fissured water under biaxial compression has been examined.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Fengjin Zhu, Hongyan Liu, Leihua Yao, Gang Mei
Summary: The study presents a new Maximum Tangential Strain criterion to predict crack initiation under compression, analyzes the factors affecting K-II and the effects of T-stress on tangential strain at the crack tip. Consistent results are observed between experimental measurements and proposed models.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Mechanics
Yao-Min Li, Bin Zhang
Summary: Crack branching in graphene under complex stresses is investigated using molecular dynamics simulations and boundary-layer models. By considering the anisotropic fracture toughness of hexagonal graphene, a Wulff-like curve is plotted based on the maximum energy release rate (MERR) criterion, showing the direction of crack kinking is consistent with that of the weak fracture toughness along the zigzag edge. The angle of crack kinking prefers 0 degrees /30 degrees /60 degrees, contrary to the angle predicted by the maximum circumferential stress criterion. The T-stress along the crack front, obtained through the over-deterministic method, can indicate the possibility of kink formation, especially for zigzag cracks. This study incorporates the Wulff-like curve and MERR criterion to accurately predict nanocrack paths in graphene.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Li-Zhu Jin, Chang-Yu Zhou, Chen-Yang Yu, Qi Pei, Le Chang, Xiao-Hua He
Summary: Through theoretical analysis and experimental study, crack initiation characteristics of HT200 and PMMA under compression were investigated, demonstrating that considering T-stress components in the modified fracture criterion is more consistent with experiments and crack initiation angle is related to material properties.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2022)
Article
Chemistry, Physical
Shuai Hou, Zhihai Cai, Youli Zhu, Qizhi Zhao, Yong Chen, Han Gao, Hongbo Wang, Jing Li
Summary: A modified J-integral calculation method is used to evaluate the impact of shot peening on crack propagation in structures. The results show that shot peening is beneficial for suppressing fatigue crack propagation, but can accelerate crack propagation when crack depth exceeds the depth of the compressive stress layer. Increasing shot velocity is more effective in retarding fatigue crack propagation.
Article
Mechanics
Zhen Shen, Hongjun Yu, Licheng Guo, Liulei Hao, Shuai Zhu, Kai Huang
Summary: A modified 3D G-criterion is proposed for crack under mixed mode I-III loadings, which considers the influence of T-stress and differentiates the volumetric and distortional ERRs. The criterion is validated by comparing predicted and experimental results, and the effects of ERR ratio, Poisson ratio, and T-stress on tilt angle, twist angle, and critical SIF are discussed. The results showed that the tilt angle is nonzero only when a certain threshold of T-stress is reached, and the twist angle increases and then decreases with increasing T-stress. Moreover, an increase in Poisson ratio leads to an increase in the twist angle and a slight decrease in critical SIF.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Z. Yan, W. J. Feng, Ch Zhang
Summary: This paper investigates the interfacial crack growth in piezoelectric-piezomagnetic bi-layered composite structures using the extended finite element method. The study modifies and extends the mechanical energy release rate criterion for PE-PM composites, taking into consideration the relation between fracture toughness and poling direction. The effects of geometries, electro-magneto-mechanical coupling loadings, and fracture toughness on interfacial crack growth are emphatically studied.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Cungen Wang, Shuhong Wang
Summary: This study modified the generalized maximum tangential stress criterion by considering parallel and perpendicular nonsingular stresses, successfully simulating open and closed crack propagation and modeling. The simulation results were in good agreement with experimental data.
ENGINEERING FRACTURE MECHANICS
(2022)
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
Materials Science, Multidisciplinary
M. M. Mirsayar
MATERIALS & DESIGN
(2015)
Article
Mechanics
M. M. Mirsayar, F. Berto, M. R. M. Aliha, P. Park
ENGINEERING FRACTURE MECHANICS
(2016)
Article
Engineering, Biomedical
M. M. Mirsayar, P. Park
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2016)
Article
Engineering, Mechanical
M. M. Mirsayar, P. Park
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2016)
Article
Engineering, Civil
M. M. Mirsayar, Kaijian Huang, Dan G. Zollinger
TRANSPORTATION RESEARCH RECORD
(2016)
Article
Mechanics
M. M. Mirsayar
ENGINEERING FRACTURE MECHANICS
(2017)
Article
Mechanics
M. M. Mirsayar, V. A. Joneidi, R. V. V. Petrescu, F. I. T. Petrescu, F. Berto
ENGINEERING FRACTURE MECHANICS
(2017)
Article
Engineering, Mechanical
M. M. Mirsayar, A. Razmi, F. Berto
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2018)
Article
Engineering, Mechanical
M. M. Mirsayar
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2018)
Article
Materials Science, Multidisciplinary
M. M. Mirsayar
MATERIALS & DESIGN
(2014)
Article
Materials Science, Multidisciplinary
Ali Reza Torabi, Behnam Shahbazian, Mirmilad Mirsayar, Sergio Cicero
Summary: The determination of ductile failure behavior in engineering components weakened by cracks and notches relies heavily on estimating the plastic zone size, particularly the effective plastic zone size. This study proposed a methodology for determining the PZS around blunt V-notches subjected to mixed mode loading and plane-stress conditions. Elastic-plastic finite element analyses were conducted to verify the proposed methodology.
Article
Chemistry, Multidisciplinary
Mohammad Reza Mohammad Aliha, Hadi Ghesmati Kucheki, Mirmilad Mirsayar
Summary: A novel test configuration called adhesive short bend beam specimen was utilized to study the cracking behavior of adhesive bounded joints in this research. The results showed that the specimen is a good candidate for investigating the mixed mode I/II fracture behavior of adhesive bounded joints due to its sensitivity to different adhesive and adherent types.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
A. Razmi, M. M. Mirsayar
CONSTRUCTION AND BUILDING MATERIALS
(2017)
Article
Materials Science, Multidisciplinary
A. T. Samaei, M. R. M. Aliha, M. M. Mirsayar
MATERIALS PHYSICS AND MECHANICS
(2015)
