摘要
为了研究反应材料在落锤加载下的反应性能,利用10kg落锤直接加载反应材料,获得了材料在落锤不同落高加载下的应力—时间曲线;将应力—时间曲线和高速摄影拍摄结果进行了对比,并分析计算了单位质量材料在发生反应时的吸收能量;基于材料的Johnson-Cook本构模型,使用有限元计算软件LS-DYNA计算了加载过程中的材料力学性能变化。结果表明,在无约束情况下使用10kg落锤加载,随着落锤下落高度的增加,应力随时间的变化越快,材料在1000μs时发生反应,对应的临界应力为281MPa,单位质量反应材料在发生反应时吸收的能量为40.9J/g,数值计算结果与实验结果能够吻合,进一步验证了材料Johnson-Cook本构模型的合理性。
To investigate the reactive properties of reactive material under the load of drop-weight,the stress-time curves of material under different drop height loading of drop-weight were obtained by directly loading reactive material with a 10kg drop-weight.The stress-time curves were compared with the results of high-speed photographs,and the absorption energy of the unit mass of material during the reaction was analyzed and calculated.Based on the Johnson-Cook constitutive model of materials,the changes of mechanical properties during loading were calculated by using finite element calculation software LS-DYNA.The results show that under unconstrained loading with 10 kg drop-weight,the stress changes rapidly with time with increasing the drop-weight height,the material reacts at 1000μs,the corresponding critical stress is 218MPa,and the energy absorbed by the unit mass of material during the reaction is 40.9J/g.The simulation results are in agreement with the experimental ones and further verify the rationality of the Johnson-Cook′s constitutive model of materials.
作者
陈鹏
屈可朋
陈荣
袁宝慧
CHEN Peng;QU Ke-peng;CHEN Rong;YUAN Bao-hui(Xi′an Modern Chemistry Research Institute,Xi′an 710065,China;National University of Defense Technology,Changsha 410073,China)
出处
《火炸药学报》
EI
CAS
CSCD
北大核心
2019年第2期197-201,206,I0006,共7页
Chinese Journal of Explosives & Propellants
基金
国家自然科学基金(No.11672328)
国家安全重大基础研究项目
关键词
固体力学
反应材料
落锤加载
反应性能
冲击引发反应材料
solid mechanics
reactive material
load of drop-weight
reactive properties
impact initialed reactive material
