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《Journal of Vibration and Shock》 2015-04
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Dynamic fracture tests for a beam containing unilateral pre-existing cracks under impact loads

LI Qing;ZHANG Di;YANG Yang;HAO Jian-wei;XUE Yao-dong;WANG Qiang-xun;LI Jin-yu;School of Mechanics and Architecture Engineering,China University of Mining & Technology;  
By means of experimental method of dynamic caustics,the dynamic fracture behaviors,such as,stress intensity factor,extension track,and crack's extending velocity and acceleration of precast beams with a single crack and double cracks under impact loads were analyzed comparatively. The experiment results indicated that when the impact point is directly upon the main crack,the double-crack beam's cracking initiation time is the earliest with a extension track of the main crack slightly offsetting to the secondary crack in the late stage of cracking extension; the single-crack beam of I-type's cracking initiation time is secondary with a straight line extension track of the main crack; the cracking initiation time of the double-crack beam with two cracks offset to the impact point is the latest with obvious bending fracture; the more serious the bending fracture phenomenon during the process of crack extension,the smaller the maximum extending velocity; in the whole process from the hammer contacting the beams to specimens fracture,their stress intensity factors vary oscillatorily; the stress intensity factors of the secondary crack of the double-crack beam decrease dramatically in the middle stage of the main crack extending.
【Fund】: 国家自然科学基金资助项目(51374212 51134025)
【CateGory Index】: O346.1
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