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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。
In order to improve the fracture toughness and reliability of ceramic materials and improve the ability of materials to resist damage, an optimized multi-toughening mechanism is applied to the development of alumina-based ceramic materials. Phase change toughening mechanism can dissipate part of the energy, reduce the stress concentration at the crack tip, prevent or delay the crack growth rate. When the reinforcement phase distribution is more reasonable and the material density is higher, the crack deflection and bridging toughening mechanism can effectively weaken the crack propagation power and improve the fracture toughness of the material. The crack propagation problem was discussed by means of extended finite element method (X-FEM), which provided a new idea for the analysis of multiple toughening mechanisms of ceramic composites.