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
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, 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
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
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
Polymer Science
Pawel Zielonka, Szymon Duda, Grzegorz Lesiuk, Wojciech Blazejewski, Magdalena Wisniewska, Joanna Warycha, Pawel Stabla, Michal Smolnicki, Bartosz Babiarczuk
Summary: This study investigates the influence of mixed-mode behavior on the fracture toughness of epoxy resin. The results show that the addition of inorganic fillers significantly reduces the fracture toughness in mode I and mode II. Furthermore, the crack initiation angle has a reasonable correlation with theoretical predictions for higher values of the KI/KII factor.
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
Attasit Wiangkham, Atthaphon Ariyarit, Anantaya Timtong, Prasert Aengchuan
Summary: Artificial intelligence is used to predict fracture toughness in engineering problems, specifically in the field of fracture mechanics. By reducing the use of actual testing data and incorporating fracture criterion data, the concept of multi-fidelity modeling is proposed to improve the efficiency of artificial intelligence models.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Mechanics
Wei Liu, Yulong Li, Zhiqian Zhang, Liyun Yang, Yi Luo, Zhongwen Yue
Summary: This study investigates the mixed-mode I+II fracture characteristics of V-notched rock specimens under impact loads, considering the effects of loading rate, notch angle, and loading angle. Experimental and numerical analysis results show that loading rate has a significant positive effect on the fracture toughness value, but has a negative effect on the crack initiation angle.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Composites
Yu Gong, Libin Zhao, Jianyu Zhang, Ning Hu, Chuanzeng Zhang
Summary: This paper examines the effects of complex failure mechanisms on the flexural modulus of multidirectional laminates and proposes an improved data reduction method to accurately characterize fracture toughness and develop standard test procedures for mixed-mode delamination.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Sreekumaran Sreenath, Kaliyaperumal Saravana Raja Mohan, Gunasekaran Murali
Summary: This study investigates the effect of GGBS on the fracture toughness of RPCs under different fracture modes, and finds that incorporating GGBS and fibers can significantly improve the fracture toughness of RPCs.
Article
Engineering, Mechanical
Zhiqiang Gan, Wen Hua, Jiuzhou Huang, Lin Huang, Xin Pan, Shiming Dong
Summary: The study investigated the impact of temperature and chemical corrosion on the mixed mode fracture characteristics of sandstone. The results showed that Keff had different degrees of decline in various solutions and temperatures, with physicochemical reactions being direct causes of weakening properties.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
K. V. Vaishakh, R. Narasimhan
Summary: Crystal plasticity based finite element simulations were performed to study the mixed-mode notch tip fields of a basal-textured Mg alloy under plane strain conditions. The results showed that the notch orientation profoundly affected the distribution of equivalent plastic strain and hydrostatic stress, highlighting the importance of plastic anisotropy of Mg alloys.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
Shuling Gao, Lin Qi, Yanping Zhu, Wenchang Wang
Summary: In the study of fracture properties of ECC, it was found that the initial fracture toughness remained stable when the notch depth ratios were between 0.3 and 0.8. However, KunIC, GI, and GI-II exhibited variations within different ranges as a/h increased.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Attasit Wiangkham, Prasert Aengchuan, Rattanaporn Kasemsri, Auraluck Pichitkul, Suradet Tantrairatn, Atthaphon Ariyarit
Summary: Artificial intelligence plays a significant role in solving complex problems, including fracture mechanics. By combining experimental data with fracture criteria data, an artificial intelligence model was created, resulting in more accurate predictions compared to using only experimental data.
Article
Engineering, Mechanical
Attasit Wiangkham, Atthaphon Ariyarit, Prasert Aengchuan
Summary: This study created a model using artificial intelligence methods to predict the fracture toughness of sugarcane leaf composite materials. The Artificial Neural Network, Generalized Regression Neural Network, and Gaussian Process Regression models all showed good performance in predicting fracture toughness. Despite some decline in performance with changing predictive factors, the models remained within an acceptable range.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Energy & Fuels
Prasert Aengchuan, Attasit Wiangkham, Niti Klinkaew, Kampanart Theinnoi, Ekarong Sukjit
Summary: In this study, the performance of an ethanol-diesel blend was improved by adding neat castor oil. A model based on the generalized regression neural network was created to predict the influence of castor oil on the characteristics of the blend. Experimental results showed that the addition of 10% castor oil improved the fuel properties of the blend and kept them within the specified limits. However, it also resulted in lower thermal efficiency and changes in emissions.
Article
Energy & Fuels
Chalita Kaewbuddee, Somkiat Maithomklang, Prasert Aengchuan, Attasit Wiangkham, Niti Klinkaew, Atthaphon Ariyarit, Ekarong Sukjit
Summary: The study aims to investigate and compare the effects of blending waste plastic oil with n-butanol on diesel engines and exhaust gas emissions. The experimental results showed that the addition of n-butanol to waste plastic oil reduced engine efficiency and increased hydrocarbon and carbon monoxide emissions. An optimization process using a general regression neural network (GRNN) was conducted to find the suitable ratio of n-butanol blends, taking engine load and blend ratio as input factors and engine performance and emissions as output factors. The results showed high predictive performances of the optimization model. Rating: 8/10
Article
Chemistry, Physical
Attasit Wiangkham, Prasert Aengchuan, Rattanaporn Kasemsri, Auraluck Pichitkul, Suradet Tantrairatn, Atthaphon Ariyarit
Summary: Artificial intelligence plays a significant role in solving complex problems, including fracture mechanics. By combining experimental data with fracture criteria data, an artificial intelligence model was created, resulting in more accurate predictions compared to using only experimental data.
Article
Engineering, Mechanical
Attasit Wiangkham, Atthaphon Ariyarit, Anantaya Timtong, Prasert Aengchuan
Summary: Artificial intelligence is used to predict fracture toughness in engineering problems, specifically in the field of fracture mechanics. By reducing the use of actual testing data and incorporating fracture criterion data, the concept of multi-fidelity modeling is proposed to improve the efficiency of artificial intelligence models.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Education & Educational Research
Attasit Wiangkham, Rattawut Vongvit
Summary: The rapid development of metaverse technology opens up numerous opportunities for social interaction, collaboration, communication, and knowledge-sharing. However, issues regarding approval, accessibility, privacy, and user behavior must be resolved for widespread adoption. This study used an extended Unified Theory of Acceptance and Use of Technology model to investigate the factors driving metaverse technology adoption in engineering education and found that cyber security, performance expectancy, social influence, and hedonic motivation significantly impact behavior intention to use metaverse technology for learning.
EDUCATION AND INFORMATION TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Attasit Wiangkham, Niti Klinkaew, Prasert Aengchuan, Pansa Liplap, Atthaphon Ariyarit, Ekarong Sukjit
Summary: This study investigates the impact of adding diethyl ether (DEE) to pyrolysis oil derived from mixed plastic waste on engine performance, combustion characteristics, and emissions. The addition of DEE resulted in decreased fuel properties and NOx emissions, while engine performance declined at low engine loads but improved at high engine loads with increasing DEE concentration. The NSGA-II algorithm with GRNNs model accurately predicted the optimal DEE percentage for maximizing engine efficiency and minimizing emissions.
Article
Materials Science, Multidisciplinary
Nutchanan Petcharat, Attasit Wiangkham, Auraluck Pichitkul, Suradet Tantrairatn, Prasert Aengchuan, Sujin Bureerat, Suwatjanee Banpap, Piyanat Khunthongplatprasert, Atthaphon Ariyarit
Summary: Composite materials play a crucial role in modern engineering, reducing weight while maintaining structural strength. 3D printing allows for the fabrication of complex composite parts with customizable mechanical properties. To improve efficiency and reduce experimental waste, this study proposes an optimization-based technique to determine the optimal 3D printing material proportions.
MATERIALS TODAY COMMUNICATIONS
(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)