获取材料应力应变关系的锥形压入新方法

发布时间：2018-07-07 15:13

本文选题：压入设备 + 应力应变关系　；参考：《中国测试》2016年04期

【摘要】：采用自主研发的便携式压入设备,对材料平滑表面进行单调压入试验获得载荷—深度曲线,进而获得材料的单轴应力应变关系曲线。在等向强化、各向同性、单调加载条件下,基于能量原理和有限元分析提出应用双锥无卸载的压入载荷—深度曲线预测具有Hollomon律的材料应力应变关系半解析新公式。在有限元验证方面,根据不同材料的Hollomon律应力应变作为有限元本构关系条件获得的载荷—深度分析结果与压入载荷—深度关系吻合较好。在试验方面,通过压入载荷—深度曲线得到加载曲率,然后利用半解析新公式得到的材料单轴应力应变关系与单轴拉伸试验结果进行比较,结果表明新方法获取的材料应力应变关系和单轴拉伸试验结果有较好的一致性。
[Abstract]:The load-depth curve was obtained by monotonic indentation test on the smooth surface of the material, and the uniaxial stress-strain curve of the material was obtained by using the portable indentation equipment developed by ourselves. Under isotropic, isotropic and monotone loading conditions, a new semi-analytical formula for predicting the stress-strain relationship of materials with Hollomon law is presented based on energy principle and finite element analysis. In the aspect of finite element verification, the results of load-depth analysis obtained by using Hollomon law stress and strain of different materials as the constitutive relation of finite element are in good agreement with that of indentation load-depth relationship. In the aspect of test, the loading curvature is obtained by pressing the load-depth curve, and then the uniaxial stress-strain relationship obtained by using the new semi-analytical formula is compared with the results of uniaxial tensile test. The results show that the stress-strain relationship obtained by the new method is in good agreement with the results of uniaxial tensile test.
【作者单位】：西南交通大学力学与工程学院应用力学与结构安全四川省重点实验室;
【基金】：国家自然科学基金(11472228)
【分类号】：O344.1

【相似文献】