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在金属拉伸等试验中,测定的性能数值一般是通过测量和运算而得到。由于计算的特点,这一类数值可能出现多位或无穷多位数字,但这些数字并不是都具有实际意义。在表达或书写这些数字时,只能根据实际需要和测试方法所能达到的精度,写出有限多位数,这就需要对数值进行修约处理。 按照国标GB228—87中对测定性能数值的修约间隔的规定,很多常用金属材料,在拉伸试验时,测试到σ_P、σ_s和σ_b等性能的数值在修约间隔为5的范围内(>200～1000N/mm~2)对其进行修约时,需先将被修约的数值乘以2,再将其积按有关修约法则修约到10单位,最后还要除以2。显然,照这样进行修约,比较烦琐,效率低。为了克服这些不足,本文就介绍一种修约间隔为5时的简易修约方法。
In the metal tensile test, the measured performance values are generally obtained by measuring and computing. Due to the nature of the calculations, there may be more or less digits in this category of numerical values, but these numbers are not all practical. When expressing or writing these numbers, the finite number of digits can only be written based on the actual needs and the precision that can be achieved by the test method, which requires the rounding of the values. According to the national standard GB228-87 in determining the performance of the repair interval between the provisions of many commonly used metal materials in the tensile test to test the value of σ_P, σ_s and σ_b performance rounding interval of 5 (> 200 ~ 1000N / mm ~ 2) When revise it, it is necessary to multiply the value to be revoked by 2, and then revise the product to about 10 units according to the rule of contract, and finally divide by 2. Obviously, according to such a contract, more cumbersome, inefficient. In order to overcome these shortcomings, this article introduces a repair contract interval of 5:00 simple repair method.