论文部分内容阅读
按GB228-76测定屈服强度σ_0.2对应的负荷P_0.2,有二种作图方法,即在拉伸曲线上,自弹性直线段与变形(位移)轴的交点O起,截取一规定残余伸长的距离OB,再从B点作平行子弹性直线段的直线BA交拉伸曲线于A点。对应于A点的负荷即为P_0.2,见图1(a)及(b)。图1(a)的拉伸曲线为试样的负荷一伸长曲线,图1(b)的是负荷-夹头位移曲线,l_a为引伸计基础长度,l为试样平行长度。试验表明,只要试验机的弹性在
According to GB228-76 measured yield strength σ_0.2 corresponding to the load P_0.2, there are two kinds of mapping method, that is, in the tensile curve, the elastic straight line segment and the deformation (displacement) axis intersection O from the interception of a specified residue Elongation distance OB, and then from the point B as a straight line parallel to the sub-elastic BA cross-stretch curve at the A point. The load corresponding to point A is P_0.2, see Figure 1 (a) and (b). Figure 1 (a) tensile curve for the load-elongation curve of the sample, Figure 1 (b) is the load - chuck displacement curve, l_a extensometer base length, l is the sample parallel length. Test shows that as long as the flexibility of the testing machine in