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Theoretical model of FTOFD method The physical basis of FTOFD method is that when the proper ultrasonic waves pass a crack, diffraction waves propagating to all directions will be generated at tips...Trans. Nonferrous Met. Soc. China 22(2012) 2679-2684 In-situ quantitative monitoring of fatigue crack using fastest time of flight diffraction method DU Chao-liang1, 2, WANG Yi-shou2, 3, GAO......
Crack detection using integrated signals from dynamic responses of girder bridgesWANG Zuo-cai(王佐才), REN Wei-xin(任伟新)(Department of Civil Engineering, Hefei University of Technology, Hefei 230009... girder bridges with multiple cracks of various depths were analyzed. Sensitivity analysis was conducted on various effects of crack depth, moving window width, noise level, bridge discretization......
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恒位移下BaTiO3单晶在空气中亚临界裂纹扩展与畴变赵显武1,褚武扬2,乔利杰2(1.北京市北京大学力学与空天技术系2.北京科技大学 腐蚀与防护中心)摘 要:用正交偏振光显微镜,通过原位观察研究了恒位移下BaTiO3单晶贯穿裂纹快速扩展与畴变的关系,以及在室温空气中(湿度为35%RH)亚临界裂纹扩展和畴变的关系.结果显示,加载开始时首先出现畴变,且其体积分数随载荷升高而增大;当载荷达到临界值时,裂纹快速形核,扩展并止裂,在空气中保持恒位移,畴变能慢慢发生,即空气中水吸附能促进畴变,当畴变发展到临界条件时就引起裂......
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Elastic-plastic analytical solution for centric crack loaded by two pairs of point shear forces in finite plate ZHOU Xiao-ping(周小平)1, LING Tong-hua(凌同华)2 1. School of Civil Engineering...: The near crack line analysis method was used to investigate a centric crack loaded by two pairs of point shear forces in a finite plate, and the analytical solution was obtained. The solution......
Test of subcritical crack growth and fracture toughness under water-rock interaction in three types of rocksHAO Rui-qing(郝瑞卿), LI Jiang-teng(李江腾), CAO Ping(曹平), LIU Bo(刘博), LIAO Jun(廖峻) (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)Abstract:The subcritical crack growth and fracture toughness in peridotite, lherzolite and amphibolite were......
Effect of stress ratio on fatigue crack growth of Ti40 alloy WU Huan(吴欢)1, 2, ZHAO Yong-qing(赵永庆)1, ZENG Wei-dong(曾卫东)2 1. Titanium Research Center, Northwest Institute for Non-ferrous Metal...; Abstract: The effect of stress ratio on fatigue crack growth (FCG) behavior of Ti40 alloy was analyzed. A unified approach, developed by VASUDEVAN and SADANANDA was used......
J. Cent. South Univ. Technol. (2008) 15(s1): 453-456 DOI: 10.1007/s11771-008-398-8 Effect of holes on in-plane shear (Mode Ⅱ) crack sub-critical propagation of rock XIE Hai-feng(谢海峰), RAO Qiu...) test and newly designed electrically conductive adhesive method were used to measure shear crack sub-critical propagation time and rate of sandstone specimen. Different cubic specimens......