Article
Mechanics
Rathin Maity, Akhilendra Singh, Surajit Kumar Paul
Summary: This study experimentally investigates 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 to induce out-of-plane mode in addition to mode-I and mode-II loading. The crack deflection angle and fracture envelope were compared against standard criteria to predict failure.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Monika Duda, Dariusz Rozumek, Michal Smolnicki, Anna Wybraniec
Summary: The article discusses the results of a study on fatigue fracture in mixed and I + II and I + III modes in heat treated steel 42CrMo4. It presents different mechanical properties resulting from various thermal treatments and demonstrates tests conducted on different sample types and load angles. The research aims to enhance understanding of fatigue crack development under mixed modes and provide valuable insights into the material's behavior under complex loads.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
Zhida Ren, Beizhi Li, Qingzhi Zhou
Summary: This study investigates the damage caused by rolling contact fatigue (RCF) and the propagation of fatigue cracks in bearings. Through experiments and statistical analysis, the three-dimensional geometry of RCF cracks was characterized and reconstructed. Finite element analysis and numerical studies were conducted to reveal the crack propagation behavior and mechanisms on the contact surface and subsurface.
Article
Materials Science, Multidisciplinary
Aurelien Doitrand, Dominique Leguillon, Gergely Molnar, Veronique Lazarus
Summary: We study the problem of crack front segmentation into facets under mixed mode I + III loading and show that facet nucleation is more likely to occur when considering both T-stress and mode-dependent fracture properties. We highlight that crack front segmentation is a material and loading dependent phenomenon, not solely determined by mode mixity threshold, but also influenced by T-stress magnitude and critical shear energy release rate.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Materials Science, Multidisciplinary
Monika Duda, Dariusz Rozumek, Grzegorz Lesiuk, Michal Smolnicki, Bartosz Babiarczuk, Joanna Warycha
Summary: This paper presents the results of an experimental investigation on fatigue crack development in heat-treated 42CrMo4 steel under mixed-mode I + II and I + III. The tests were conducted using compact tension shear specimens and rectangular cross-section specimens for mixed-mode I + III. The paper also discusses the fracture analysis results of fatigue crack path development.
INTERNATIONAL JOURNAL OF FRACTURE
(2022)
Article
Mechanics
L. Wang, Y. J. Xie, H. Yuan
Summary: The potential fracture configurations of a cracked solid under mixed Mode-I/III loading were investigated using a three-dimensional energy-based model, which effectively captured the physical process of energy release induced by multiple cracks initiation. Four integral subintervals for J(i)-integral around a crack tip were suggested to maximize the energy release rate, and the four concerned energy-based driving forces were identified. The results theoretically predicted various potential fracture configurations for cracked solids under the mixed Mode-I/III loading, and agreed well with experimental results.
ARCHIVE OF APPLIED MECHANICS
(2023)
Article
Engineering, Mechanical
Miao Xinting, Jiang Chenyang, Zhou Changyu, Peng Jian, Gao Guangfan
Summary: This paper investigates the effects of specimen type and thickness on fracture parameters for mixed mode cracks, showing the significant impact of coupling effect and mode I component on crack tip field and fracture behavior. It is suggested that a new mixity parameter considering the coupling effect is needed to describe mixed mode cracks accurately. Additionally, the paper emphasizes the influence of specimen type over thickness on constraint for mixed mode cracks.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Shiv Sahaya Shukla, K. S. R. K. Murthy, S. Sajith
Summary: In this work, mixed mode (I/III) fracture behavior was investigated using a new specimen and an out-of-plane loading fixture compatible with conventional uniaxial universal testing machines. The proposed specimen, a single edge cracked circular (SECC) specimen, can be used for metallic and non-metallic materials under static and fatigue loads. Finite element analyses and experimental fracture studies were conducted, showing good agreement with existing mixed mode (I/III) fracture criteria. The results indicate that the pure mode III fracture toughness is 1.46 times greater than that of mode I, attributed to an increase in the inelastic region around the crack tip. Fractured surface analysis revealed rougher surfaces with increasing mode III component. Preliminary fatigue crack growth studies on Al 7075-T6 using the SECC specimen were also presented, confirming the applicability of the proposed setup for studying mixed mode fracture behavior under static and fatigue loading.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Sina Ilyaei, Yousef Abubasir, Reza Sourki
Summary: This study investigated the effects of mixed-mode loading conditions on 3D printed porous scaffolds, revealing that design parameters and pore characteristics significantly impact mechanical strength.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Ali O. Ayhan, Oguzhan Demir
Summary: The study conducted experiments and numerical simulations on mixed mode I/II/III fatigue crack growth, evaluating a new 3-D fracture criterion for its applicability in 3-D mixed mode fatigue problems. The developed criterion showed better predictability for crack growth surface under highly mixed mode conditions, reducing deviation from experimental surface compared to other criteria.
COMPUTERS & STRUCTURES
(2021)
Article
Mechanics
A. Bahmani, F. Farahmand, M. R. Janbaz, A. H. Darbandi, H. Ghesmati-Kucheki, M. R. M. Aliha
Summary: This study compared two test specimens, ENDB and ENDC, for measuring mixed-mode I+III fracture toughness. The loading type significantly affected the fracture parameters, with ENDC exhibiting more stable mixed-mode fracture but sensitivity to crack inclination angle rotation. The optimal crack length for measuring mixed-mode I+III fracture toughness was found in the ENDB specimen, while pure mode III fracture toughness was greater in the ENDC specimen. Various parameters, including T-stress, influenced the differences in fracture toughness values measured via both specimens.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Mathias Lebihain, Jean-Baptiste Leblond, Laurent Ponson
Summary: In a previous study, the instability threshold for crack front fragmentation under mixed-mode I+III loading conditions was derived. Numerical simulations showed the significant role of specimen size on non-coplanar instability. The presence of non-singular stresses was found to affect crack front fragmentation, with positive non-singular stresses promoting the process and negative non-singular stresses hindering it.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Mechanics
Yue Sheng, Hongda Yang, Wentao Ma, Xiaoyu Jiang
Summary: This article describes a dislocation emission model applicable to body-centered cubic (BCC) crystals with micro-scale grain size and discusses the critical conditions of dislocation emission, the behavior of dislocations at crack tips, and the influence of grain boundaries on dislocation emission and distribution.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Civil
M. A. Hussien, M. Moawad, M. H. Seleem, H. E. M. Sallam, H. M. El-Emam
Summary: In this study, the fracture toughness of fiber-reinforced concrete was experimentally determined using matrix cracked specimens. A comparison was made with traditional through-thickness cracked specimens. The results showed that the matrix cracked specimens provided a more realistic estimation of fracture toughness and the effect of fiber length on toughness was marginal.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Mechanics
Shuancheng Wang, Bing Yang, Jian Li, Shuwei Zhou, Shoune Xiao
Summary: In this paper, a theoretical analytical solution of the Christopher-James-Patterson (CJP) model in mixed mode is presented, considering the influence of roughness-induced crack closure (RICC) on fatigue crack growth. A new effective stress intensity factor range (ΔKP-R) is proposed as the driving force for crack propagation. Experimental testing showed that both the 8% compliance offset criterion and the parabolic-line method were suitable for determining the crack-opening force. The solution includes plasticity-induced crack closure (PICC) and RICC effects, providing a more effective description of crack propagation behavior.
ENGINEERING FRACTURE MECHANICS
(2023)