摘要
惯性效应是造成SHPB试验中试件应力不均匀和多轴性的主要因素。对SHPB试验中的径向惯性效应进行了分析,发展了Dharan修正模型,考虑了径向应力的不均匀分布和试验加载过程中试件变形速度的变化,推导了新的径向惯性修正公式。计算分析表明,修正公式可有效减小测试应力应变曲线的振荡,消除波形中上升沿波头对屈服应力测试的影响。
Effect of inertia is one of the main sources that would cause the stress nonuniformity and triaxial stress state in specimen. A theoretical analysis on the stress status of specimen in the SHPB experiment with lateral inertia was derived, in which nonuniform distributing lateral stress in specimen and the variation of specimen deformation velocity in the loading process was considered. The calculation shows the correction can minimize the deviation of the determined stress-stain effectively and eliminate the influence of the waveform rising edge on the bend stress determination.
出处
《西南科技大学学报》
CAS
2008年第2期15-18,共4页
Journal of Southwest University of Science and Technology
基金
国家自然科学基金(10602048)
北京理工大学爆炸与冲击国家重点实验室开放基金(KFJJ06-4)
中国工程物理研究院科学技术基金(20060105)支持
关键词
SHPB
径向惯性
数值模拟
SHPB
Lateral inertia
Numerical simulation
