摘要
建立了弹-靶冲切模型,通过数值模拟获得了应力瞬态卸荷条件下靶板能量的变化过程;提出了考虑时间效应的能量释放速率指标,建立了以能量释放速率为核心的能量破坏准则,揭示了应力瞬态卸荷条件下靶板的破坏机理;同时,分析了靶板损伤程度与卸荷速率的关系.研究表明:在高速冲切诱发的应力瞬态卸载条件下,靶板中的能量呈现出动态波动的特征,应变能先减小后增大最后趋于稳定,动态变化过程中产生动力峰值.能量快速释放是导致靶板破坏的重要机理之一,在40MPa的应力水平下,能量瞬态释放可使靶板损伤区范围增大4.8%~11.9%.
Projectile-target punching model was set up to get the changes of energy through numerical simulation under transient unloading conditions.By considering the time effect of energy release,the index of energy release velocity was proposed,the energy failure criterion was established based on energy release velocity,and the failure mechanism of target plate under transient stress unloading was revealed.Meanwhile,the relationship between target damage scope and unloading rate was analyzed.Research shows that under the condition of stress transient unloading induced by high-speed punching,the energy in the target plate fluctuates dynamically,and the strain energy can be reduced first,then increases and finally tends to be stable,and the dynamic peak is generated during the changing process.High-speed release of energy in the punching process is one of the important mechanisms that cause the failure of the target.Under the stress level of 40 MPa,the energy transient release can increase the damage range of the plate by 4.8%~11.9%.
作者
严鹏
董凯
宁金华
刘军
YAN Peng;DONG Kai;NING Jinhua;LIU Jun(State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan 430072, China;Yalong River Hydropower Development Co. Ltd., Chengdu 610051, China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第7期8-12,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家十三五重点专项课题资助项目(2016YFC0401802)
国家自然科学基金资助项目(51779192)
国家自然科学基金雅砻江联合基金资助项目(U1765109)
关键词
受压靶板
能量释放速率
能量破坏准则
应力瞬态卸荷
动态波动
pressure plate
energy release velocity
energy failure criterion
stress transient unloading
dynamic fluctuation
