摘要
脆性材料内部含有大量裂纹,当某一裂纹扩展时,其他裂纹会对扩展裂纹产生影响。为了研究冲击载荷下,脆性材料内两裂纹的相互影响、连通规律及裂纹尖端应力强度因子的变化规律,利用有机玻璃板制作了含非平行双裂纹的实验试件,利用落板冲击设备进行了中低速冲击实验,结合有限元分析软件ABAQUS计算出裂纹尖端应力强度因子,利用有限差分软件AUTODYN进行了动态数值模拟研究,并将其模拟结果与实验结果进行对比分析。实验及模拟结果表明:裂纹破坏形态与AUTODYN数值模拟破坏形态基本一致;试件的断裂形态随着两裂纹间距不同而不同;裂纹间的相互影响程度随着裂纹间间距增大而减小;裂纹尖端应力强度因子KⅠ随着裂纹间距的增大而减小,而KⅡ随着裂纹间距增大而增大。
A multitude of flaws always exists in brittle material and the influence will be exerted on by other flaws when one flaw is propagating.To investigate the propagation,coalition behavior and stress intensity factors of two cracks in brittle materials under impact loading,Polymethyl methacrylate(PMMA)was selected to manufacture the double cracked specimens.By using the medium-low speed impact system,impact experiments were conducted,and the crack tip SIFs were calculated by using finite element code ABAQUS.The finite difference code AUTODYN was used in the simulation crack propagation behavior,and the simulation results were compared with the test results.The results of experiment and simulation show that the simulation results generally agree with the experimental results in crack propagation paths;the crack propagation behavior varies with the change of the distance between the two cracks;the effect between the two cracks decreases with the increase of the distance between the two cracks;the stress intensity factors KⅠ decrease with the increase of the distance between the two cracks while KⅡ is the opposite.
作者
周琴
朱哲明
王雄
董玉清
周磊
ZHOU Qin;ZHU Zheming;WANG Xiong;DONG Yuqing;ZHOU Lei(Key Laboratory of Deep Underground and Science and Engineering,Ministry of Education,Sichuan University,Chengdu 610065,Sichuan,China;College of Architecture and Environment,Sichuan University,Chengdu 610065,Sichuan,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2019年第11期40-54,共15页
Explosion and Shock Waves
基金
国家自然科学基金（11672194
11702181）
四川省安全监督局安全生产科技项目（aj20170515161307）
四川省科技计划（18SYXHZ0094）
关键词
双裂纹
应力强度因子
有限元软件
裂纹扩展行为
double cracks
stress intensity factor
finite element code
crack propagation behavior
