摘要
本文给出了钢、铅和钢-铅层合体在高应变率下力学性能的实验结果,并提出了一种方法。根据这一方法,钢-铅层合体的本构关系可利用钢和铅的本构关系推导出,该方法的正确性已为文中给出的实验结果证实。
The steel-lead vesseels are extensively used in nuclear power industry. To avoid any catastrophe, it is of importance to know the mechanical behaviour of steel-lead laminate under various conditions, including impulsive loading. Furthermore, it is interesting to know whether the stress-strain relation of steel-lead laminate can he deduced directly from the stress-strain relations of steel and lead, respectively.In this paper, the experimental results for steel.lead and steel-lead laminate are presented. The high strain rate tests were preformed on a computerized Split Hopkinson Pressure Bar (SHPB). According to the experimental results, the visco-plastic behavior of steel and lead may he described by a logrithmic law and a Stater's equation, respectively.Because of the fact that the yield strain of lead is less than that of steel, the deformation of steel-lead laminated specimen in the axial compression should include four stages. The first three .deformation stages are much shorter so that the last deformation stage is mainly taken into consideration. Its stress-strain relation is σ2=(σp+ασs)/(1+α)where σp σand σ are axial stresses of lead, steel and steel-lead laminate respectively, and a is the ratio of cross section area of steel to that of lead. The calculated results are in good agreement with the experimental results. Then it can be seen that according to the model suggested in present paper, the axial visco-plastic stress-strain relation of steel-lead laminate can be deduced from the corresponding stress-strain relations of steel and lead. KEY WORDS stress-strain relation, impulsive loading, steel-lead laminate.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
1989年第1期1-10,共10页
Explosion and Shock Waves
