为了确定一批材料的力学性能,通常用该材料数量有限的样品进行试验。样品的数量对于测量结果的误差、可靠性十分重要。对于复合材料,因其制作工艺复杂,难以稳定,在同一批产品中,破坏强度、疲劳寿命等参数波动较大。同时,各测试单位也因其所取试验样品数量不同,致使各家数据出入很大,难以对比。诚然,通过增加样品数量可以减小测量误差,提高测试结果的置信水平。但是,考虑到时间和费用,样品数量 In order to determine the mechanical properties of a batch of materials, a limited number of samples are usually tested. The number of samples for the measurement results of the error, reliability is very important. For the composite material, because of its complicated manufacturing process, it is difficult to be stable. In the same batch of products, the parameters such as breaking strength and fatigue life fluctuate greatly. At the same time, the test units because of the number of test samples taken by them, resulting in a great deal of data, it is difficult to compare. Indeed, by increasing the number of samples can reduce the measurement error, improve the confidence level of the test results. However, taking into account the time and cost, the number of samples