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

作　　者：谭毅 杨书仪[1] 孙要兵 郭小军 TAN Yi;YANG Shuyi;SUN Yaobing;GUO Xiaojun(School of Mechanical Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;School of Power&Energy,Northwestern Polytechnical University,Xi’an 710129,Shaanxi,China;AECC South Industry Corporation Limited,Zhuzhou 412002,Hunan,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,Hunan,China)

机构地区：[1]湖南科技大学机电工程学院,湖南湘潭411201 [2]西北工业大学动力与能源学院,陕西西安710129 [3]中国航发南方工业有限公司,湖南株洲412002 [4]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《爆炸与冲击》2024年第1期86-105,共20页Explosion and Shock Waves

基　　金：湖南省自然科学基金面上项目(2020JJ4026);湖南省研究生科研创新项目(CX20210997)。

摘　　要：针对航空发动机机匣材料ZL114A铝合金,构建描述该材料在较大温度范围下大变形及失效行为的材料模型。通过万能试验机及分离式霍普金森压杆试验装置测试ZL114A铝合金在常温准静态、高温和高应变率下的力学性能,分析温度和应变率对材料流动应力的影响。采用有限元程序和优化算法反求25~375℃内材料的硬化参数,结合高应变率(1310~5964 s^(-1))下材料的动态行为关系,构建包含塑性应变、温度及应变率的经验型本构模型。开展缺口拉伸、缺口压缩等试验并建立相对应的有限元模型,获取材料在不同应力三轴度下的失效应变,标定分段形式的Johnson-Cook(J-C)失效准则参数。通过不同温度下的平板侵彻试验和数值模拟验证失效准则及其参数的有效性。结果表明,ZL114A铝合金具有明显的应变硬化、温度软化及高应变率强化特性;具有应力饱和特征的Hockett-Sherby(HS)硬化模型较为准确地描述材料大变形下的力学行为;构建的材料本构关系可以描述ZL114A铝合金在大应变、宽温度、高应变率下的力学行为;分段形式的失效准则具有预测不同温度下材料失效行为的能力。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 1310-5964 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 result

关 键 词：ZL114A铝合金 本构关系 反求 失效准则 侵彻 

分 类 号：O344.3[理学—固体力学] TG146.21[理学—力学]