复合材料疲劳性能研究

Fatigue Performance of Composites

对复合材料的疲劳性能进行了研究,通过对典型复合材料疲劳性能的测试及试验结果进行分析和讨论,得到结论(:1)该复合材料疲劳寿命的分散性较大,尤其在较低寿命区,故个别点的疲劳寿命无法满足90%置信度的中值寿命;(2)从疲劳试验过程的观察可发现,试样表面出现分层后,还有较长的一段寿命期;(3)通过疲劳试验结果得到±45°铺贴的复合材料条件疲劳极限σr=91.656MPa。

Fatigue properties of composites are studied, the typical composites fatigue performance is tested and test results are analyzed and discussed, conclu- sion is obtained： （l）the dispersivity of the fatigue life of composite materials is larger, especially in the low life expectancy, so the fatigue life of individual points cannot meet the 90% confidence level of the value of lifb; （2）ob- servation from fatigue test process finds when the sample surface appears layer, it still has a long life period; （3） through the fatigue test results of plus or minus 45° brick composites thtigue limit condition is σr= 91.656MPa.