摘要
为研究1,3,5?三氨基?2,4,6?三硝基苯(TATB)基高聚物粘结炸药(PBX)中张开型裂纹在准静态载荷下的失效与破坏行为,设计了含预制裂纹的半圆盘弯曲试验,应用数字图像相关方法和90000 fps的高速摄影技术分别研究了实验中裂纹的起裂及扩展行为。结果表明,试样沿预制裂纹方向发生脆性劈裂破坏,应变分析显示裂纹尖端有显著的拉伸应变集中区域。在裂纹扩展路径上仅裂纹尖端区域的应变演化有显著的时间效应,且演化过程有一个显著的拐点,约0.85 p_(max)载荷,裂纹尖端的应变集中效应在拐点后才开始显现并快速扩展。裂纹扩展过程中有显著的塑性迟滞现象。裂纹尖端的应变分布和演化特性的分析表明,TATB基PBX在裂纹尖端局部发生了塑性变形,且塑性变形对裂纹的起裂与扩展行为有明显影响。
To study the failure and damage behavior of opening mode crack in 1,3,5-triamino-2,4,6-trinitrobenzene(TATB)-based polymer bonded explosive(PBX)under quasi-static loading,a semi-circular bending(SCB)specimen with pre-fabricated crack was designed.The initiation and propagation behavior of cracks in the experiments were studied by digital image correlation method and high speed photography technology of 90000 fps,respectively.Results show that the brittle fracture of sample occurs along the pre-fabricated crack direction,and the strain analysis shows that there is a significant tensile strain concentration region.On the crack propagation path,only the strain evolution of crack tip region has a significant time effect,and the evolution process has a significant inflection point at loading of about 0.85 pmax.The strain concentration effect at the crack tip begins to appear and expand rapidly after the inflection point.There is a significant plastic delaying phenomenon during the crack propagation process.The analyses of strain distribution and evolution characteristics at the crack tip indicate that plastic deformation of TATB-based PBX takes place locally at the crack tip,and the plastic deformation has an obvious influence on the initiation and propagation behavior of the crack.
作者
刘晨
蓝林钢
陈华
唐明峰
甘海啸
李明
LIU Chen;LAN Lin-gang;CHEN Hua;TANG Ming-feng;GAN Hai-xiao;LI Ming(Institute of Chemical Materials,CAEP,Mianyang 621999,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2019年第3期190-195,I0002,共7页
Chinese Journal of Energetic Materials
基金
国家自然科学基金NSAF联合重点项目(U1330202)
国家自然科学基金(11702262
11572294)
科技部重大仪器专项(2013YQ03062907)
