GCr15轴承钢大变形弹塑性力学性能试验研究

Experimental Research on Elestoplastic Mechanical Properties of GCr15 Bearing Steel under Large Deformation

对GCr15轴承钢大变形弹塑性力学性能进行了试验研究,分析了应力三轴度和洛德角对GCr15轴承钢大变形弹塑性力学性能的影响。在研究中,对GCr15轴承钢进行拉伸、压缩、剪切压缩等不同应力状态下的力学性能试验。通过试验确认,GCr15轴承钢在拉伸和压缩状态下无颈缩现象,发生脆性断裂;在剪切压缩状态下发生韧性断裂,形成大变形。基于力学性能试验,修正Bai-Wierzbizki本构模型的各项参数,并应用有限元软件建立GCr15轴承钢剪切压缩三维模型,进行数值模拟验证。研究结果表明,同时包含应力三轴度和洛德角可以更好地预测GCr15轴承钢的剪切大变形。

The elastoplastic mechanical properties of the GCr15 bearing steel under large deformation were experimentally studied,and the effects of stress triaxiality and Lode angle on the elastoplastic mechanical properties of the GCr15 bearing steel under large deformation were analyzed.In the research,the mechanical properties of the GCr15 bearing steel under different stress states such as tension,compression,and shear compression were tested.It is confirmed through experiments that the GCr15 bearing steel has no necking phenomenon under tension and compression,and brittle fracture occurs.Ductile fracture occurs under shear compression,resulting in large deformation.Based on the mechanical testing,the parameters of the Bai Wierzbizki constitutive model were revised,and the finite element software was used to establish the 3D shear compression model of the GCr15 bearing steel for verification by numerical simulation.The research results show that when stress triaxiality and Lode angle are contained at the same time,the large shear deformation of the GCr15 bearing steel can be predicted in a better way.