DH-36钢的塑性流动统一本构关系研究  

STUDY OF PLASTIC FLOW UNIFIED CONSTITUTIVE RELATION FOR STEEL DH-36

作　　者：孟卫华[1] 郭伟国[1] 苏静[1] 张晓琼[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《力学学报》2011年第5期958-962,共5页Chinese Journal of Theoretical and Applied Mechanics

基　　金：国家自然科学基金(10872169);爆炸科学与技术国家重点实验室基金(KFJJ11-11Y);国防973项目(61311602)资助项目~~

摘　　要：通过对DH-36钢动态应变时效的规律和试验数据进行系统分析,发展和建立了描写第3种动态应变时效的本构模型.然后基于热激活物理概念本构模型和塑性流动应力组合原理,加入对第3种动态应变时效的描述,获得了统一本构模型.该模型不仅可以描写第3种动态应变时效,还可以预测DH-36钢在温度77K～1000K,应变率0.001s^(-1)～3000 s^(-1)范围内的塑性流动应力,通过比较发现统一本构模型预测结果与试验结果吻合很好.Through systematically analysing the dynamic strain aging behaviour and the testing data of structural steel DH-36, the constitutive model of the third-type dynamic strain aging has been developed. Then based on thermal-activated physical concept constitutive model and the combinatorial principle of plastic flow stress, a unified constitutive model is finally obtained with the description for the third-type dynamic strain aging. This model not only can describe the third-type dynamic strain aging phenomenon, but also the mechanical behaviour of DH-36 steel in a wide range of temperatures （77-1 000 K） and strain rates （0.001-3 000 s^-l）. There is a good agreement between theoretical predictions and experimental results.

关 键 词：本构模型 DH-36钢 动态应变时效 塑性流动 温度 应变率 

分 类 号：TG142.7[一般工业技术—材料科学与工程]