提高非接触式位移/应变视频测量仪的拉伸试验精度

运用IMETRUM非接触式位移/应变视频测量仪在配备接触式引伸计的MTS810材料试验机上对Q235钢表面喷漆试样进行静拉伸对比试验。结果表明：两种测试仪器得到的应力-应变曲线基本重合,在弹性变形和屈服阶段也重合得较好,所测得的各项力学性能指标基本吻合;虽然在弹性变形阶段IMETRUM位移/应变视频测量仪所得的应力-应变曲线相对于接触式引伸计所得的曲线较弯曲,线性略差,但两者拟合得到的杨氏弹性模量基本相同。证实了拉伸试样表面喷漆处理可以显著提高IMETRUM位移/应变视频测量仪的拉伸试验精度。

Improvement on Tensile Test Accuracy Utilizing Non Contact Video Gauge

By utilizing non contact video gauge of IMETRUM corporation at MTS 810 material testing system equipped with contact extensometer,results comparison about static tensile testing of painting specimens made of Q235 steel was performed.The results show that stress versus strain curves obtained by these two different instruments nearly coincide.In elastic deformation and yield stage the two curves also coincide better.Acquired mechanical properties by means of these two different instruments coincide basically.In elastic deformation stage relationship of stress versus strain by means of video gauge curves slightly,and its linearity is relatively lower,but acquired Young’s modulus of elasticity by means of video gauge is almost equal to that by contact extensometer.In summary,painting treatment on the specimen surface can improve significantly accuracy about static tensile testing of metallic material by utilizing IMETRUM video gauge.