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基于扩展有限元的陶瓷复合材料多重增韧机制

, PP. 669-675

Keywords: 氧化铝,陶瓷复合材料,多重增韧,相变,扩展有限元

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Abstract:

为了提高陶瓷材料的断裂韧性和可靠度,改善材料抵御破坏的能力,将优化的多重增韧机制应用到氧化铝基陶瓷材料的开发中。相变增韧机制可以耗散部分能量,降低裂纹尖端处的应力集中程度,阻止或延缓裂纹扩展速率。当增强相分布较为合理、材料的致密度较高时,裂纹偏转与桥接增韧机制可以有效地削弱裂纹扩展动力,提高材料的断裂韧性。利用扩展有限元(X-FEM)手段讨论了裂纹扩展问题,为分析陶瓷复合材料的多重增韧机制提供了新思路。

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