GB/T 228.1—2010应变速率应用情况及对新版标准的建议

Application of Strain Rate in GB/T228.1-2010 and Suggestions for the Next Version of the Standard

根据GB/T228.1-2010中的方法 A,采用业内认可度较高的拉伸试验机并配置刚性较高的液压平推夹具,采用具有连续屈服和不连续屈服的试样,验证方法 A的第一种应变速率的速率范围2和第二种应变速率的速率范围2和3的速率相对误差。结果表明:连续屈服试样,采用第一种应变速率的速率范围2时,其标距内的应变速率相对误差在±40%以内,略超±20%的标准要求。不连续屈服试样,采用第二种应变速率的速率范围2时,标距和平行长度内应变速率相对误差为±100%,超出±20%的标准要求;采用第二种应变速率的速率范围3时,平行长度内应变速率相对误差在±20%以内,符合标准要求。建议GB/T228.1-2010修订时对方法 A应变速率的相对误差进行适用性验证或进行适当调整,使新标准更适用于现有检验技术。

According to the Method A in GB/T 228.1-2010,the tensile test machine with high industry recognition and the hydraulic parallel pushing fixture with high rigidity were used.And the samples with continuous yield and discontinuous yield were used to verify the rate relative error of rate range 2 of the first strain rate and rate range 2 and 3 of the second strain rate in Method A.The results show that the relative error of rate range 2 of the first strain rate in the gauge length of the continuous yield samples was within±40%,which slightly exceeded the standard requirement of±20%.When the rate range 2 of the second strain rate,the relative error of strain rate in the gauge length and the parallel length of the discontinuous yield samples was ±100%,which exceeded the standard requirement of±20%.When the rate range 3 of the second strain rate,the relative error of strain rate in the parallel length of the discontinuous yield samples was within±20%,which met the standard requirements.It is suggested that the applicability of the relative error of the strain rate of Method A be verified or make appropriate adjustments when GB/T 228.1-2010 is revised so that the new standard more suitable for the existing test technology.