Article
Engineering, Mechanical
Jiuzhou Huang, Wen Hua, Dengsong Li, Xiang Chen, Xutao You, Shiming Dong, Jianxiong Li
Summary: Fracture tests were conducted on cracked Brazilian disc specimens to study the compression-shear fracture properties of sandstone under confining pressure. The results show that the confining pressure environment contributes to the increase in the strength of the sandstone. The fracture toughness of sandstone specimens exhibits a linear correlation with the confining pressure.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Nanoscience & Nanotechnology
Dhrubjyoti Baruah, S. Arjun Sreedhar, Saurabh Kumar Gupta, Satyam Suwas, R. Narasimhan
Summary: This study investigates the effect of temperature on the mixed-mode fracture response of a rolled AZ31 Mg alloy. Experimental results show that the fracture toughness Jc enhances by a factor of about 3.5, irrespective of mode mixity over the temperature range studied. The change in fracture mechanism from brittle cracking to ductile void growth and coalescence is observed as the temperature increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Mechanics
Shima Najjar, Abolfazl Mohammadzadeh Moghaddam, Ali Sahaf
Summary: This study investigated the fracture properties of Cement Emulsified Asphalt Mortar (CEAM) in mixed mode I&II fractures, optimizing fracture energy through experiments and mixture design. Cement and asphalt were identified as key factors affecting fracture energy and optimal mix design, with an increase in asphalt emulsion-to-cement ratio leading to decreased maximum carried force.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Wen Liu, Zhi Li, Zheng Li
Summary: This study conducted mixed-mode I/II fracture tests on two types of glued laminated bamboo boards, and found that the thin-layer bidirectional-arranged glued laminated bamboo boards have better fracture toughness and higher resistance to tensile/shear loading compared to the thick-layer unidirectional-arranged laminated bamboo lumber.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Mahmoud Alneasan, Abdel Kareem Alzo'ubi
Summary: This study aims to investigate the effect of temperature on rock fracture behavior. The results show that as the temperature increases, the behavior of clay-rich rocks changes from ductile to brittle, leading to a significant increase in fracture toughness and crack propagation speed. Additionally, the fracture resistance under mixed-mode loading also significantly improves.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Chenxi Zhang, Diyuan Li, Changsong Wang, Jinyin Ma, Aohui Zhou, Peng Xiao
Summary: This study is of great significance for practical activities in underground works. It investigates the shear fracture behavior under elevated confining pressure and reveals the influence of confining pressure on rock. It also analyzes the effect of confining pressure on the morphological characteristics of shear fracture surfaces.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Geological
Peiwang Cao, Tao Zhou, Jianbo Zhu
Summary: This study investigates the rate dependent behavior of mixed mode I/II fracture toughness in rock. Split Hopkinson pressure bar tests were performed on cracked sandstone specimens with different loading angles and strain rates. The results show that the peak load and peak strain increase with increasing strain rates while the influence of loading angle is almost negligible. Dynamic mode I and mode II stress intensity factors as well as effective fracture toughness increase rapidly with increasing strain rate before reaching a plateau. The findings of this study contribute to a better understanding of the rate effect of mixed mode I/II fracture and its micromechanism.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Mechanical
Dan Ioan Stoia, Emanoil Linul, Liviu Marsavina
Summary: This study investigates the mixed-mode fracture properties of laser sintered polyamide through experimental data and theoretical predictions. The results reveal discrepancies between theoretical approaches and experimental data, attributed to the interlayer fracture phenomenon.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Attasit Wiangkham, Atthaphon Ariyarit, Prasert Aengchuan
Summary: Artificial intelligence is increasingly used in materials testing for tasks such as new material design and predicting materials properties. In this particular study, artificial neural networks and adaptive neuro-fuzzy inference systems were used to predict fracture toughness of PMMA. The models showed high accuracy in predicting fracture toughness under different conditions, although there were slight discrepancies when compared to experimental values.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2021)
Article
Mechanics
Jonathan Tapullima, Sang Hoon Song, Jin Hwe Kweon, Jin Ho Choi
Summary: The study developed a new stitching process for reinforcement in composite structures and proposed a mode II analysis to define cohesive parameters. Various stitching patterns were tested with two types of dry carbon fiber yarns as reinforcement.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Geological
Wei Wang, Yixin Zhao, Teng Teng, Cun Zhang, Zhenhua Jiao
Summary: Bedding planes significantly influence the effective dynamic fracture toughness and crack propagation characteristics of coal, with decreasing DFT and crack propagation velocity as the bedding-plane angles increase. The crack initiation direction is affected by bedding planes, and the crack propagation path is jointly determined by the direction of maximum principal stress and bedding planes. In pure mode I, crack propagation velocities increase with the increase of bedding-plane angles, while in mixed-mode I-II, the largest velocity occurs at a bedding-plane angle of 45 degrees, with loading velocities peaking at this angle before decreasing rapidly.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Construction & Building Technology
Wen Liu, Kangning Li, Shilang Xu
Summary: This study investigates the use of bamboo biochar as an admixture in mortar to improve compressive strength and crack-resistance ability. The biochar meets the requirements for a Class N - pozzolan and has a pozzolanic reaction ability. The biochar mortar shows higher compressive strength and improved fracture toughness compared to the control mortar without biochar.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Mechanical
Reyhane Ebrahimi, Mehdi Hosseini, Alireza Taleb Beydokhti
Summary: This study investigated the impact of low-temperature heating-cooling cycles on the mode I and mode II fracture toughness of travertine, a widely used rock in modern building facades. The research found that the fracture toughness increased after a heating-cooling cycle but then decreased with an increasing number of cycles, consistent with changes in mechanical properties and SEM images.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Burak Yenigun, Muhammad Salman Chaudhry, Elli Gkouti, Aleksander Czekanski
Summary: This study investigates the influence of temperature and loading rate on the interlaminar fracture behavior of CNT-CFRP. The results show that the fracture toughness of CNT-CFRP increases with increasing amount of CNT, but decreases at higher CNT amounts. The fracture toughness also increases with the loading rate in both Mode I and Mode II. As for temperature, Mode I fracture toughness increases with temperature while Mode II fracture toughness increases up to room temperature and then decreases.
Article
Engineering, Mechanical
Siyab Houshmandi Khanghahi, Pouria Rasi Irdmousa, Sajad Rezaee, Seyed Javid Zakavi, Yousef Majd Shokorlou
Summary: This study investigates the fracture toughness of Gilosonite modified hot mix asphalt (HMA) mixtures. The tests were conducted at different temperatures and loading modes. The results show that the fracture toughness of HMA mixtures increases with decreasing temperature, and Gilsonite has different effects on fracture toughness at different temperatures. At -18 degrees C, Gilsonite has a negative influence on fracture toughness, while at 25 degrees C, it considerably improves fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
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)