Predictions of thermo-mechanical behavior of a Nicalon-CAS 0°-90° ceramic matrix composite from constituent materials properties
Predictions of thermo-mechanical behavior of a Nicalon-CAS 0°-90° ceramic matrix composite from constituent materials properties
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DOI：
10.1177/0021998311401099
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发表时间：
2011-05
影响因子：
2.9
通讯作者：
C. Tang;D. Hayhurst
中科院分区：
文献类型：
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作者：
C. Tang;D. Hayhurst
本文用作者以前建立的陶瓷基复合材料丝束热机械行为的物理模型研究了Nicalon-CAS 0°/90°层合板的性能。对于这种材料，室温单轴应力-应变曲线和横向热导率-应变曲线可从以前的实验研究，这些曲线已被用作基准，以评估模型的保真度。对于应力-应变行为，使用动态纤维失效模型，该模型假设由0°/90°复合材料铺层引起的局部横向应力立即使纤维拔出失活并引发动态纤维失效;因此，触发丝束的轴向应力区域的灾难性失效。该模型可以准确地预测0°/90°层合板的实验测量应力-应变-失效行为。对于横向热导率行为，预测结果与实验结果吻合较好。此外，它已被证实的横向热导率的退化的效果是由于应变驱动的wakedebonded裂纹的增长。
A physics-based model, developed previously by the authors, for the thermo-mechanical behavior of ceramic matrix composite tows is used to study the performance of a Nicalon-CAS 0°/90° laminate. For this material, the room temperature uni-axial stress—strain curve and the transverse thermal conductivity—strain curves are available from a previous experimental investigation; these curves have been used as benchmarks to assess the fidelity of the model. For the stress—strain behavior, a dynamic fiber failure model is utilized which assumes that the local transverse stressing arising from the 0°/90° composite lay-up instantaneously deactivates fiber pullout and initiates dynamic fiber failure; and hence, triggers catastrophic failure of the axially stressed regions of the tow. The model is shown to accurately predict the experimentally measured stress—strain-failure behavior of the 0°/90° laminate. For the transverse thermal conductivity behavior, the predictions show good agreement with experimental results. Furthermore, it has been confirmed that the effect of the degradation of transverse thermal conductivity is due to strain driven growth of wakedebonded cracks.