摘要
采用万能试验机和霍普金森压杆(SHPB)系统,对火灾爆炸下921A钢高温力学性能及动态力学性能进行研究。基于试验数据,分别拟合Johnson-Cook本构模型、Cowper-Symonds本构模型,修正Cowper-Symonds模型应变硬化项,并通过试验验证了有效性。参考Johnson-Cook本构模型温度项耦合方法,建立综合考虑温度软化效应和应变率强化效应的921A钢本构模型。
The high temperature mechanical properties and dynamic mechanical properties of 921 A steel under fire and explosion are studied by using universal testing machine and Split Hopkinson Pressure Bar(SHPB) system. Based on the test data, the Johnson-Cook constitutive model and the Cowper-Symonds constitutive model are fitted, and the strain hardening term of the Cowper-Symonds model is modified. Their validity is verified by tests. Referring to the method of coupling of temperature term in Johnson-Cook constitutive model, a 921 A steel constitutive model considering the temperature softening effect and strain rate strengthening effect is established.
作者
徐磊
卢永锦
XU Lei;LU YongJin(Shanghai Marine Equipment Research Institute, Shanghai 200031, China)
出处
《船舶工程》
CSCD
北大核心
2019年第1期69-73,共5页
Ship Engineering
关键词
921A钢
火灾爆炸
力学性能
本构关系
steel 921 A
fire and explosion
mechanical properties
constitutive relation
