孔径对T300/BPM 316复合材料层合板的载荷放大系数影响

Effect of different aperture on load enhancement factor of T300/BPM316 notched composite laminates

首次对铺层方式为[45/-45/0/0/-45/90/0/90/45/0]s的新型T300/BPM 316含不同孔的复合材料层合板进行疲劳试验;采用改进的联合威布尔分布分析复合材料的疲劳寿命分散性;并运用MATLAB软件编写程序,分别对不同孔径的复合材料进行计算得到其部件的载荷放大系数。结果表明:在本文研究的材料孔径为D5、D8、D9范围内,随着孔径的增大,复合材料的疲劳分散性逐渐增大,说明复合材料的疲劳分散性随损伤(本文指含孔)的增大而增大;同时,载荷放大系数单调递增。且研究发现,T300/BPM 316含孔复合材料层合板的载荷放大效果不明显,说明对不同的复合材料需要分别确定其载荷放大系数来进行疲劳寿命加速试验。

Experimental research on the fatigue performance for the new T300/BPM 316 composite laminates containing holes with the stacking sequence of [45/-45/0/0/-45/90/0/90/45/0]s is carried out. Firstly, dispersion of composite material fatigue life is analyzed by improved joint of the Weibull distribution, and the MATLAB software is used to develop program. Load enhancement factor of composite materials with different aperture is calculated. Results obtained show that in this research, for materials aperture range of D5, D8 and D9, composite materials fatigue dispersion increases gradually with the increase of aperture, which means that composite materials fatigue dispersion increases with the increase of damage(in this paper, including hole). Load enhancement factor is monotonic increasing at the same time. Results indicate that the load enhancement effect of T300/BPM 316 composite laminated plate containing holes is not obvious, which means that load enhancement factors of different composite materials should be determined separately for fatigue life accelerated tests.