Results 31 to 40 of about 4,014,681 (349)

Effect of Constraint and Crack Contact Closure on Fatigue Crack Mechanical Behavior of Specimen under Negative Loading Ratio by Finite Element Method

Metals, 2022
Mechanical behaviors at fatigue crack tips of cracked specimens under negative loading ratios are studied in detail by the finite element method in this paper.
Xinting Miao, Haisheng Hong, Xinyi Hong, Jian Peng, Fengfeng Bie   +4 more
doaj   +1 more source

Discontinuous fibrous Bouligand architecture enabling formidable fracture resistance with crack orientation insensitivity

Proceedings of the National Academy of Sciences of the United States of America, 2020
Significance Inspired by the survival war between the “spear” of mantis shrimps with Bouligand-type microstructures and the “shield” of abalone with nacreous staggered architectures, we design an architecture, a combination of Bouligand and nacreous ...
Kaijin Wu, Zhaoqiang Song, Shuaishuai Zhang, Y. Ni, S. Cai, X. Gong, Linghui He, Shuhong Yu   +7 more
semanticscholar   +1 more source

Mode Localization of a Cracked Blade-Disks [PDF]

Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education, 1998
In this paper, the effect of blade crack on the mode localization of a rotating blade-disk is studied. Pretwisted taper beams are used to simulate blades of a blade-disk. The crack on the blade can be regarded as a local disorder of this periodically coupled blades system.
J. H. Kuang, B. W. Huang
openaire   +1 more source

Fatigue life prediction of z-fibre pinned composite laminate under mode I loading [PDF]

, 2019
A hybrid method is presented combining linear elastic fracture mechanics with nonlinear damage mechanics that can predict the fatigue crack growth rate in z-fibre pinned composites under mode I loading.
Ayre, David, Lemanski, Stuart, Tang, Suchao, Zhang, Xiang   +3 more
core   +2 more sources

Crack path selection at the interface of wrought and wire+arc additive manufactured Ti–6Al–4V [PDF]

, 2016
Crack propagation deviation tendency in specimens containing an interface between wrought alloy substrate and Wire + Arc Additive Manufacture (WAAM) built Ti–6Al–4V is investigated from the viewpoints of microstructure, residual stress and bi-material ...
Addison, Antonysamy, Antonysamy, ASTM, Baufeld, Baufeld, Brandl, Brandl, Colegrove, Dahlin, Dattoma, Ding, Edwards, Edwards, Edwards, Evans, Fan, Frazier, Hills, Irwin, Kelly, Leuders, Lorant, Martina, Mok, Nègre, Paradowska, Peters, Pippan, Prime, Prime, Rangaswamy, Schroeder, Taminger, Van Hooreweder, Wang, Wang, Zhang, Zhang, Zhu   +39 more
core   +3 more sources

Cracking Mode Analysis of Crack Initiation in Rocks under Uniaxial Compression

Advance in Civil Engineering, 2019
Crack initiation is related to the behavior of the preexisting microcracks within a rock specimen, which suggests the specimen starts to fail. The determination of crack initiation stress is important for identifying the elastic stage and related ...
Y. Lou, Guangqing Zhang, Xiaoxiao Wang
semanticscholar   +1 more source

Some Studies on Verifying the Applicability of Free Vibration-based Modes Shapes Method to Rectangular Shaped Cracks in a Cantilever Beam

U.Porto Journal of Engineering, 2022
Cracks weaken structures. When the crack size increases in service, the structure becomes weaker than its earlier condition. Lastly, the structure may break down due to a small crack.
vikas khalkar, S. G. Kumbhar, P. Hariharasakhtisudhan, A. A. M. Moshi, S. D. Jadhav, N. Kumbhar, P. Oak, P. S. Joshi   +7 more
doaj   +1 more source

Dynamics and Instabilities of Planar Tensile Cracks in Heterogeneous Media

, 1997
The dynamics of tensile crack fronts restricted to advance in a plane are studied. In an ideal linear elastic medium, a propagating mode along the crack front with a velocity slightly less than the Rayleigh wave velocity, is found to exist.
B. Cotterell, B. Lawn, D. Ertaş, Daniel S. Fisher, E. S. C. Ching, G. Perrin, H. Bergkvist, J. Fineberg, J. Hodgdon, J. Morrissey, J. R. Willis, J. Schmittbuhl, L. B. Freund, M. Kardar, M. Marder, Onuttom Narayan, P. Daguier, Sharad Ramanathan   +17 more
core   +1 more source

Study on the dynamic propagation and numerical simulation of mode Ⅰ and mixed mode Ⅰ-Ⅱ cracks in PMMA specimens with unilateral semicircular holes

矿业科学学报, 2020
A new approach is provided to study the growth problems of mode Ⅰ and mode Ⅰ-Ⅱ mixed cracks, Split Hopkinson Pressure Bar(SHPB) is used to impact the PMMA USH(Unilateral semicircular hole) specimen containing precast crack.Results of mode Ⅰ cracks and ...
Li Chengxiao, Zhang Yuantong, An Chen
doaj   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source