Article
Engineering, Mechanical
F. Lamon, L. Maragoni, P. A. Carraro, M. Quaresimin
Summary: The influence of reinforcement architecture on the fatigue behavior of woven composites was evaluated by comparing laminates based on crack initiation, crack growth and crack density evolution. It was found that the fatigue behavior in terms of crack initiation could be predicted through local stresses in the matrix.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Mechanics
Deepesh Yadav, Balila Nagamani Jaya
Summary: This study investigates the effect of feature size, volume fraction, and sample size on the damage resistance of a specially designed brittle polymer. Holes with varying diameters and number of layers were created in samples of different sizes and tested under bending. Results showed that the fracture resistance increased with larger hole diameters and more layers, while sample size increase led to catastrophic failure and decreased damage resistance. These effects were explained through crack driving force calculations using finite element modeling.
ENGINEERING FRACTURE MECHANICS
(2023)
Review
Chemistry, Physical
Hong Hu, Chi Zhang, Yichun Ding, Fan Chen, Qiyao Huang, Zijian Zheng
Summary: This review critically examines the advanced structural engineering strategies used for developing strain-tolerant stretchable electronics, discussing well-known lateral designs such as island-bridge, wavy structures, fractals, and kirigami, while also shedding light on less-explored vertical strategies like strain isolation and the elastoplastic principle. The paper concludes by envisioning potential advancements in this rapidly evolving field.
Article
Materials Science, Multidisciplinary
Xu Zhao, Weihua Zhang, Hui Chen
Summary: A parameter, fractal dimension, was used to characterize fatigue damage caused by PSBs in the fusion zone of SUS301L-HT laser-arc hybrid welding joints. The fractal dimension first increased and then tended to be stable with different stress levels. PSBs at the inner wall of a notch were likely to provide natural nucleation sources for crack initiation, and short cracks merged to develop larger cracks.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Composites
Robert B. Zando, Ataollah Mesgarnejad, Chunzhou Pan, Sandra J. Shefelbine, Alain Karma, Randall M. Erb
Summary: Crack deflection is often used as evidence of substantial fracture toughness in composites, with recent advances in composite manufacturing allowing for the creation of detailed microstructures that can locally tune fracture toughness anisotropy. In this study, a herringbone pattern structure effectively traps propagating cracks along a spine to enhance fracture toughness, demonstrating the potential for improved material properties through structural design. The results suggest that controlling crack propagation direction can significantly boost overall material performance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Mechanics
Zhao Duan, Chenxi Dong, Xusheng Yan, Qiang Sun, Bin Li
Summary: This study investigates the fracture damage behavior of loess using three-point bending tests and explores the relationship between crack angles and mechanical strength, crack evolution, and acoustic emission signals. The results provide an in-depth understanding of the fracture damage mechanism of loess.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Computer Science, Information Systems
Ziqi Dong, Furong Tian, Hua Yang, Tao Sun, Wenchuan Zhang, Dan Ruan
Summary: Based on heterogeneous trajectories, our proposed framework matches face trajectories with corresponding mobile phone trajectories to achieve object tracking or trajectory prediction. Our solution consists of two stages: selecting phone trajectories for a given face trajectory and identifying which phone trajectory is an exact match. We use a Multi-Granularity SpatioTemporal Window Searching algorithm to select candidate mobile phones close to a given face, and then build an affinity function to score face-phone trajectory pairs and determine if they match. LightGBM achieves the best performance with 92.6% accuracy, 96.9% precision, 88.5% recall, and 92.5% F1. Our framework is applicable in most scenarios and may benefit downstream tasks.
Article
Engineering, Manufacturing
Rong Wang, Haitao Ye, Jianxiang Cheng, Honggeng Li, Pengfei Zhu, Bo Li, Rong Fan, Juzheng Chen, Yang Lu, Qi Ge
Summary: Ultrastrong and damage-tolerant ceramic architectures designed based on Schwarz Primitive structures and manufactured by DLP-based 3D printing are reported. The step effect of 3D printing plays a role in crack initiation and propagation, enhancing the structural strength and damage tolerance. After optimization, the printed ceramic architecture achieves high compressive strength and excellent damage tolerance.
ADDITIVE MANUFACTURING
(2023)
Article
Mechanics
Drazen Brescakovic, Otmar Kolednik
Summary: This paper investigates the use of voids and particles to enhance the failure stress and fracture toughness of brittle materials. It examines crack propagation near single elliptical voids and particles in an elastic matrix material. The study considers different loading conditions and varying Young's modulus ratios. The crack trajectories near the inhomogeneities are evaluated using the crack trajectory interpolation method. The results show that elongated voids and particles perpendicular to the crack plane are most effective for crack arrest.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Mechanics
R. Sachse, A. K. Pickett, P. Middendorf
Summary: In this paper, a systematic study was conducted on the effect of mechanical design features on fatigue crack growth in adhesive joints. A material model and methodology for fatigue crack growth analysis were presented. The results suggest that a combination of local reinforcement, through-thickness reinforcement, and compression preload are necessary for efficient crack growth arrest, while simply reducing peel stresses is not sufficient. Increasing the effective crack front length and introducing through-thickness stresses can significantly reduce local fatigue crack growth rates.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Qingquan Lai, Zixuan Chen, Yuntao Wei, Qi Lu, Yi Ma, Jianfeng Wang, Guohua Fan
Summary: Identifying the fracture resistance capabilities and gaining a deeper understanding of the controlling damage mechanisms are important to the development of press-hardened steels (PHS) for automotive applications. In this study, the fracture properties of a novel PHS alloyed with Cr and Si (CrSi-PHS) were assessed by using uniaxial tensile and double-edge notched tensile (DENT) tests. The results showed that CrSi-PHS presents a desirable compromise with strength and has a high fracture strain attributed to its high resistance to damage nucleation. Additionally, the fracture toughness parameters of CrSi-PHS are comparable to the multiphase AHSSs with lower strength levels.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Cheng Huang, Yin Yao, Bo Yang, Shaohua Chen
Summary: Recently-synthesized high-entropy alloys (HEAs) with face-centered cubic phases have shown excellent fracture toughness at room temperature and cryogenic temperatures. This study investigates the crack initiation and propagation in a model HEA CoCrFeMnNi using atomistic simulations and theoretical analysis. The results reveal hierarchical deformation mechanisms and shed light on the strain energy dissipation, which results in the outstanding fracture toughness of the HEA at both temperatures. Furthermore, the study compares the low-temperature toughening mechanism of the HEA with the low-temperature embrittlement mechanism of traditional metals.
Article
Engineering, Civil
William E. Guin, Jialai Wang
Summary: A hybrid analytical-numerical approach has been developed to determine the strain energy release rates (SERRs) in shear deformable functionally graded plates. The approach involves developing expressions for Mode I and Mode II SERRs, determining mode mixity using contour integral analysis, and using phase angle to numerically solve for a mode mixity parameter. The approach is then validated and used to investigate how SERRs and mode mixity vary across a wide range of stiffness gradations, crack lengths, and crack locations in a shear deformable functionally graded plate system.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
George Irven, Adam Whitehouse, Declan Carolan, Alexander Fergusson, John P. Dear
Summary: The methods of improving the toughness of the bond between a foam core and a carbon fibre face-sheet in a sandwich structure were investigated. It was found that introducing machined grooves in the foam and using core-shell rubber particles to toughen the face-sheets resulted in significant improvements in bond toughness. Additionally, using aramid fiber-reinforced foam as the core of the sandwich structure also contributed to enhancing the interface bond toughness and promoting R-curve behavior during crack propagation.
ENGINEERING FRACTURE MECHANICS
(2023)
Review
Mechanics
Junling Hou, Junnan Lv, Andreas Ricoeur, Yifeng Hu, Hong Zuo, Yiheng Chen, Qun Li
Summary: This paper reviews the historical investigation and state-of-the-art developments of the M-integral and its corresponding applications. It provides a comprehensive analysis of the origin, physical meanings, application in fracture mechanics, damage evolution, two-state M-integral, and experimental methods for measuring the M-integral. The article is particularly effective for failure analysis of multi-defected structures or advanced material systems.
ENGINEERING FRACTURE MECHANICS
(2022)
