超高强度钢AF1410塑性流动特性及其本构关系  

PLASTIC FLOW CHARACTERISTICS AND CONSTITUTIVE RELATION FOR ULTRA HIGH STRENGTH STEEL AF1410

作　　者：苏静[1] 郭伟国[1] 曾志银 邵小军 

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国兵器工业第二○二研究所,咸阳710099

出　　处：《固体力学学报》2012年第3期265-272,共8页Chinese Journal of Solid Mechanics

基　　金：国防973项目(61311602);国家自然科学基金(10872169);北理工开放基金(KFJJ11-11Y)资助

摘　　要：在论文中,为揭示超高强度钢AF1410的塑性流动特性,并研究其塑性流动本构关系,利用CSS4410电子万能试验机和改进的Hopkinson拉、压杆技术,对AF1410钢在温度从100K到600K,应变率从0.001/s到2000/s,塑性应变超过20%的塑性流动特性进行了试验研究.结果表明,拉伸加载下AF1410钢屈服强度低于压缩屈服强度,且随应变率增加,拉、压屈服强度差值越来越大;该材料塑性流动应力对应变率敏感性低,而对温度较为敏感;随应变率的提高,该材料拉伸失效应变减小,但温度对失效应变无明显影响.最后基于位错运动学关系,借助试验数据,获得了AF1410钢的塑性流动物理概念本构模型,并通过与经典J-C模型的结果对比对该物理概念本构模型进行了评估分析,表明该物理概念本构模型在较宽温度和应变率范围能较好的预测AF1410钢的塑性流动应力.In this paper,to understand the plastic flow behaviors of ultra high strength steel AF1410 and establish its constitutive relations, uniaxial compression and tension tests are both performed using CSS4410 quasi-static testing machine and enhanced Hopkinson pressure and tension bar technique. True strains exceeding 20% are achieved in these tests, over the range of strain rates from 0. 001 /s to about 2000/s,and at initial temperatures from 100 K to 600 K. The results show that：the yield stress under tension loading is lower than under compress loading,and the difference between the compression and tension yield stresses becomes larger with increasing strain rate,the plastic flow stress of AF1410 steel is not very sensitive on strain rate,but relatively sensitive to temperature; the failure strain decreases with increasing strain rate, but is not markedly affected by temperature. Finally, based on the mechanism of dislocation motion,paralleled with a systematic experimental investigation, a physically-based constitutive model is obtained for AF1410 steel, and is evaluated via the classical J-C model. It shows that the plastic flow of AF1410 steel could be well predicted by the present constitutive model over a broader strain rates and temperature range.

关 键 词：AF1410 塑性流动 J-C模型 失效应变 本构关系 

分 类 号：TG142.4[一般工业技术—材料科学与工程]