爆炸与冲击2024，Vol.44Issue(1)：86-105,20.DOI:10.11883/bzycj-2022-0531
ZL114A铝合金本构关系与失效准则参数的确定
Determination of constitutive relation and fracture criterion parameters for ZL114A aluminum alloy
摘要
Abstract
In order to study the containment properties of aero-engine casing made of ZL114A(ZAlSi7Mg1A)aluminum alloy under the impact of blade fragments at different temperatures,the material models describing the large deformation and failure behavior of ZL114A aluminum alloy under a large range of temperatures were established.Firstly,quasi-static tensile tests at various temperatures and dynamic compression tests were conducted in the universal testing machine and the split Hopkinson pressure bar(SHPB),respectively.Based on the force-displacement data obtained in tensile tests,the finite element code and optimization algorithm were used to reversely identify the material hardening parameters at temperatures of 25-375℃.In this process,the accuracy of two hardening laws,Ludwik and Hockett/Sherby,describing the plastic flow behavior of ZL114A aluminum alloy under large deformation were compared.Subsequently,combined with the dynamic behavior relation of ZL114A aluminum alloy at strain rates of 1310-5 964 s-1,a modified empirical constitutive model incorporating plastic strain,temperature,and strain rate was established,based on the Hockett/Sherby hardening law and Cowper-Symonds model.Further,the tests of notch tension,notch compression and shear were carried out,and the parallel finite element models were numerically calculated.The limitation of failure parameters related to failure criterion by the theoretical formula was analyzed,and the failure parameters are obtained by combining experiment and finite element method.Johnson-Cook failure criterion in branch form was used to describe the relationship between failure strain and stress triaxiality of ZL114A aluminum alloy.Considering the influence of temperature and strain rate,the failure criterion describing the failure behavior of ZL114A aluminum alloy was obtained.Finally,the validity of the fracture criterion and its parameters were verified by the ZL114A aluminum alloy flat plate penetration tests and the numerical simulations at various temperatures.The results show ZL114A aluminum alloy has obvious characteristics of strain hardening,temperature softening,and high strain rate strengthening.The Hockett/Sherby hardening law with stress saturation characteristics more accurately describes the stress flow behavior of ZL114A aluminum alloy than that of Ludwik under large deformation.The modified constitutive relation effectively describes the stress flow behavior of ZL114A aluminum alloy to a certain degree under large strain,wide temperature,and high strain rate.At the same time,the fracture criterion in branch form has good applicability to predict the impact failure behavior of flat plates at different temperatures.关键词
ZL114A铝合金/本构关系/反求/失效准则/侵彻Key words
ZL114A aluminum alloy/constitutive relation/reserve identification/fracture criterion/penetration分类
数理科学引用本文复制引用
谭毅,杨书仪,孙要兵,郭小军..ZL114A铝合金本构关系与失效准则参数的确定[J].爆炸与冲击,2024,44(1):86-105,20.基金项目
湖南省自然科学基金面上项目(2020JJ4026) （2020JJ4026）
湖南省研究生科研创新项目(CX20210997) （CX20210997）
