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GB228-87《金属拉力试验法》中,对试样断面收缩率(?)的计算,列出了以下公式:(?)=S_0-S_1/S_0×100%式中S_0——试样原始面积S_1——试样断后面积生产检验中,运用此公式计算圆钢丝的断面收缩率,程序是相当复杂的.首先是测量断前丝径,计算其圆面积.拉断后,再测量断后丝径.计算圆面积.先有这两步的计算,方能代入以上公式.现在,我们提出一个公式,可以省略这两步计算.公式如下:
GB228-87 “metal tensile test method”, the reduction of the cross-section of the sample (?) Calculation, the following formula is listed: (?) = S_0-S_1 / S_0 × 100% Where S_0-- the original sample area S_1-- test area after the test area production, the use of this formula to calculate the reduction of area of round wire shrinkage, the program is quite complex.First, measure the wire diameter before breaking, calculate its circular area.After breaking, and then measure the broken wire diameter. Calculate the circular area. The first two steps of calculation, can only be substituted into the above formula. Now, we propose a formula, you can omit the two-step calculation. Formula is as follows: