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首页> 外文期刊>Engineering Fracture Mechanics >Modeling of facesheet crack growth in titanium-graphite hybrid laminates. Part II: Experimental results
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Modeling of facesheet crack growth in titanium-graphite hybrid laminates. Part II: Experimental results

机译:钛-石墨混合层压板中面板裂纹扩展的建模。第二部分:实验结果

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摘要

Titanium-graphite hybrid composite laminates exhibit a coupled damage growth mode of facesheet cracking and delamination. Part I of this work modeled the growth of the coupled damage mode. Fatigue experiments were conducted on single edge notch tension specimens to measure the crack growth rate. This paper compares the model predictions with experimental data. The three-dimensional finite element model successfully captured the damage growth behavior for two of the lay-ups ([Ti/0/90/0_2]_s and [Ti/90/0/90_2]_s) in the experimental program. However, in a third lay-up, [Ti/0/90/+-30]_s, the underlying damage modes were found to be sufficiently different than the other two lay-ups and the model did not capture the steady-state growth behavior. The effects of temperature and specimen size were also investigated for TiGr laminates. Except for the effects of the load ratio, elevated temperatures did not affect the crack growth rate significantly. For wider specimens, the steady-state fatigue crack growth behavior was similar to the narrow specimens, indicating that the steady-state facesheet crack growth behavior is independent of specimen size.
机译:钛-石墨杂化复合层压板表现出面板破裂和分层的耦合损伤增长模式。这项工作的第一部分对耦合损伤模式的增长进行了建模。在单边缘缺口拉伸试样上进行了疲劳实验,以测量裂纹的扩展速率。本文将模型预测与实验数据进行了比较。三维有限元模型成功地捕获了实验程序中两个叠层([Ti / 0/90 / 0_2] _s和[Ti / 90/0 / 90_2] _s)的损伤增长行为。但是,在第三叠层[Ti / 0/90 / +-30] _s中,发现潜在的破坏模式与其他两个叠层充分不同,并且该模型未捕获稳态增长行为。还研究了温度和样品尺寸对TiGr层压板的影响。除了载荷比的影响外,高温并未显着影响裂纹扩展速率。对于较宽的试样,稳态疲劳裂纹扩展行为与较窄的试样相似,这表明稳态面板裂纹扩展行为与试样尺寸无关。

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