按照GB/T 228.1-2010中推荐的不同拉伸速率控制模式及拉伸速率对冷轧镀锌钢板进行了拉伸对比试验,分析了应变速率、横梁位移速率及应力速率对冷轧薄板规定非比例延伸强度Rp0.2、下屈服强度ReL以及抗拉强度Rm测试结果的影响。结果表明: 采用应变速率进行控制得到的拉伸试验数据相对其他两种速率控制模式更为稳定, 可以最大限度地降低拉伸测试结果的不确定度; 采用0.000 25 s-1的应变速率控制模式所得试验结果的稳定性与采用40~50 MPa·s-1的应力速率控制模式所得结果较为接近; 在不同拉伸速率控制模式下, 提高应变、横梁位移和应力速率均会使屈服强度Rp0.2和ReL增加, 而抗拉强度Rm基本上处于稳定状态。

Tensile comparison test was done to cold rolled galvanized steel sheet on different tensile rate control modes and tensile rate according to GB/T 228.1-2010, and the influences of strain rate, crosshead separation rate and stress rate on test results of proof strength of non-proportional Rp0.2, lower yield strength ReL and tensile strength Rm of cold rolled sheet were studied. The results show that the tensile test results on strain rate control mode were more stable than those on the other two rate control modes, and it could reduce the tensile test results uncertainty to minimum. The test results stability with strain rate of 0.000 25 s-1 was close to that with stress rate of 40-50 MPa · s-1. Under different tensile rate control mode, raising strain rate, crosshead separation rate or stress rate, the tested Rp0.2 and ReL would increase, but Rm basically was in steady state.