摘要:
对试验数据进行统计分析后,找到了T300/QY8911,T300/HD03和T300/QY8911-Ⅱ等几种常用复合材料强度性能的最大标准差,并发现:0°铺层或90°铺层的复合材料单层板强度性能分散性(变异系数或方差)要比多向铺层板大,这一性质对大多数复合材料都成立。通过对T300/QY8911,T300/HD03和T300/QY8911-Ⅱ等复合材料强度性能的分布检验,发现:复合材料强度性能遵循对数正态分布。提出复合材料强度性能可靠性设计的高精度小子样系数方法,与传统方法等进行了对比计算,发现:本文方法计算结果稳定,计算精度高,可以获得比其他方法更大的数值结果,使复合材料得到更加充分的利用,并节省试件。
Abstract:
The statistical analysis of the strength data of T300/QY8911, T300/HD03 and T300/QY8911-Ⅱ gives the maximum standard deviation. And it is shown that the strength performance scatter of the unidirectional composite laminate in 0° or 90° stacking sequence is bigger than that of the multidirectional laminates. From the statistical distribution test of the strength performance of T300/QY8911, T300/HD03 and T300/QY8911-Ⅱ, it is also found that the strength performance of these composites follows the log-normal distribution. Then a small sample factor method with high precision for the reliability design of composite strength performance is presented, and is compared with two other methods. The verification results show that this method presented in this paper can give the stable calculation results and is with high calculation precision. Moreover, it can obtain the bigger prediction values than the other methods, and more sufficiently make use of composites, so as to save specimens.
下载:
