Simultaneously measuring initiation toughness of pure mode Ⅰ and mode Ⅱ cracks subjected to impact loads

作     者：LANG Lin ZHU Zhe-ming ZHOU Chang-lin ZHOU Lei WANG Meng WANG Lu 郎林;朱哲明;周昌林;周磊;王蒙;王璐

作者机构：School of Architecture and Civil EngineeringXihua UniversityChengdu 610039China Key Laboratory of Deep Earth Science and Engineering(Sichuan University)Ministry of EducationChengdu 610065China Chengdu Surveying Geotechnical Research Institute Co.Ltd.of MCCChengdu 610023China 

出 版 物：《Journal of Central South University》 (中南大学学报（英文版）)

年 卷 期：2022年第29卷第11期

页      面：3720-3731页

核心收录：

学科分类：08[工学] 080104[工学-工程力学] 0815[工学-水利工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Projects(U19A2098,1210021843)supported by the National Natural Science Foundation of China Project(2021SCU12130)supported by Fundamental Research Funds for the Central Universities,China Project(2021YJ0511)supported by the Sichuan Science and Technology Program,China Projects(DESEYU202205,DESE202005)supported by the Open Fund of Key Laboratory of Deep Earth Science and Engineering,China 

主　　题：initiation toughness crack initiation time mode Ⅰ crack mode Ⅱ crack impact loads 

摘      要：In order to simultaneously measure the initiation toughness of pure mode Ⅰ and mode Ⅱ cracks in one specimen,a large-size double-cracked concave-convex plate(DCCP)specimen configuration was *** tests were implemented in the drop plate impact *** gauges were employed to measure impact loads and crack initiation *** corresponding numerical model was established by using the dynamic finite difference program AUTODYN,and the experimental-numerical method and ABAQUS code were utilized to obtain the initial fracture toughness of the *** experiments and numerical research,we concluded that the DCCP specimen is suitable for measuring the initial fracture toughness of pure mode Ⅰ and mode Ⅱ cracks at the same time;the dynamic initiation toughness increases with the increase of loading rate and the crack initiation time decreases with increasing loading rate;the initiation toughness of mode Ⅱ crack is 0.5 times that of mode Ⅰ crack when subjected to the same loading *** the pre-crack in the vicinity of the bottom of a sample,when its length increases from 20 to 100 mm,the dynamic initiation toughness of the pure mode Ⅰ crack gradually decreases,and the longer the lower crack length is,the easier the crack would initiate,but the dynamic initiation toughness of pure mode Ⅱ crack varies little.