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首页> 外文会议>Proceedings of the American Society for Composites Twenty-Ninth technical conference, Proceedings of the 16th US-JAPAN conference on composite materials ASTM-D30 meeting >Influence of Mixed Mode Ⅰ-Mode Ⅱ Loading on Fatigue Delamination Growth Characteristics of a Graphite Epoxy Tape Laminate
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Influence of Mixed Mode Ⅰ-Mode Ⅱ Loading on Fatigue Delamination Growth Characteristics of a Graphite Epoxy Tape Laminate

机译：Ⅰ型－Ⅱ型混合载荷对石墨环氧胶带层压板疲劳脱层生长特性的影响

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Mixed mode Ⅰ-mode Ⅱ interlaminar tests were conducted on IM7/8552 tapernlaminates using the mixed-mode bending test. Three mixed mode ratios, G_Ⅱ/G_T = 0.2,rn0.5, and 0.8, were considered. Tests were performed at all three mixed-mode ratiosrnunder quasi-static and cyclic loading conditions, where the former static tests werernused to determine initial loading levels for the latter fatigue tests. Fatigue tests at each mixed-mode ratio were performed at four loading levels, G_(max), equal to 0.5G_c, 0.4G_c,0.3G_c, and 0.2G_c, where G_c is the interlaminar fracture toughness of the corresponding mixed-mode ratio at which a test was performed. All fatigue tests were performed using constant-amplitude load control and delamination growth was automaticallyrndocumented using compliance solutions obtained from the corresponding quasi-staticrntests. Static fracture toughness data yielded a mixed-mode delamination criterion thatrnexhibited monotonic increase in G_c with mixed-mode ratio, G_Ⅱ/G_T. Fatiguerndelamination onset parameters varied monotonically with G_Ⅱ/G_T, which was expectedrnbased on the fracture toughness data. Analysis of non-normalized data yielded arnmonotonic change in Paris law exponent with mode ratio. This was not the case whenrnnormalized data were analyzed. Fatigue data normalized by the static R-curve werernmost affected in specimens tested at G_Ⅱ/G_T=0.2 (this process has little influence on the other data). In this case, the normalized data yielded a higher delamination growth rate compared to the raw data for a given loading level. Overall, fiber bridging appeared to be the dominant mechanism, affecting delamination growth rates in specimens tested at different load levels and differing mixed-mode ratios.
机译：使用混合模式弯曲试验对IM7 / 8552叠层板进行了混合模式Ⅰ-模式Ⅱ层间测试。考虑了三种混合模式比，G_Ⅱ/ G_T = 0.2，rn0.5和0.8。在准静态和循环载荷条件下，在所有三种混合模式比率下进行测试，其中使用前一种静态测试来确定后一种疲劳测试的初始载荷水平。在四个载荷水平G_（max）等于0.5G_c，0.4G_c，0.3G_c和0.2G_c的情况下，在每个混合模式比下进行疲劳测试，其中G_c是相应混合模式比在以下位置时的层间断裂韧性进行了测试。所有疲劳测试均使用恒定振幅负载控制进行，并且使用从相应的准静态测试获得的顺应性解决方案自动记录分层增长。静态断裂韧性数据产生了混合模式分层准则，表明混合模式比G_Ⅱ/ G_T导致G_c单调增加。疲劳分层起始参数随G_Ⅱ/ G_T单调变化，这是基于断裂韧性数据预期的。对非标准化数据的分析得出巴黎律指数随众数比的单调变化。分析标准化数据时不是这种情况。以静态R曲线归一化的疲劳数据在以G_Ⅱ/ G_T = 0.2测试的样本中受影响最大（此过程对其他数据影响很小）。在这种情况下，与原始数据相比，在给定的负载水平下，归一化数据可产生更高的分层增长率。总体而言，光纤桥接似乎是主要的机制，影响了在不同负载水平和不同混合模式比率下测试的样品的分层生长速率。

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