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首页> 外文期刊>Optics and Lasers in Engineering >A method of the direct measurement of the true stress-strain curve over a large strain range using multi-camera digital image correlation
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A method of the direct measurement of the true stress-strain curve over a large strain range using multi-camera digital image correlation

机译：使用多相机数字图像相关性直接测量大应变范围内真实应力-应变曲线的方法

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摘要

A quick method to directly determine the true stress-strain curve over a large strain range is proposed. The true stress-strain curve includes the post-necking strain, is directly measured via a special multi-camera digital image correlation (DIC) system. A tension test with the standard dog-bone shape specimens is used in the system. The cross-section area of the specimen throughout the test is measured by the DIC, as well as the entire field true strain. The true stress is calculated based on the measured cross-section area and the load. A dual-phase steel with a minimum 780 MPa tensile strength (DP780), as a typical advanced high-strength steel (AHSS), is used in the test to demonstrate the method and to validate the result. The true stress-strain curve including the post-necking data of DP780 is presented. The test result is validated with the theoretical calculation as well as the experimental method. Furthermore, the measured true stress-strain curve is approximated by the power law equation to identify the material constants. The methodology, experimental test, and the evaluated result are described in detail.
机译：提出了一种直接确定大应变范围内真实应力-应变曲线的快速方法。真正的应力-应变曲线包括颈缩后应变，可通过特殊的多相机数字图像关联（DIC）系统直接测量。系统中使用标准狗骨头形样本进行拉伸测试。通过DIC测量整个测试过程中样品的横截面积以及整个场的真实应变。真实应力是根据测得的横截面面积和载荷计算的。在测试中使用具有最低780 MPa拉伸强度（DP780）的双相钢作为典型的高级高强度钢（AHSS），以说明该方法并验证结果。给出了包括DP780的颈缩后数据的真实应力-应变曲线。通过理论计算和实验方法验证了测试结果。此外，通过幂定律方程近似测得的真实应力-应变曲线以识别材料常数。详细介绍了方法，实验测试和评估结果。

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