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陶瓷相变增韧分析的新型屈服准则

DOI: doi:10.3969/j.issn.1006-7043.2011.01.005

Keywords: 氧化锆陶瓷, 屈服准则, 本构模型, 相变增韧

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Abstract:

针对陶瓷基复合材料由于含有大量孔洞等缺陷而导致拉伸强度和压缩强度不相等的问题,引入新的参数,构建了抛物线型屈服准则,并类比塑性材料相关联流动法则,给出了陶瓷相变材料的本构方程.在平面应变条件下,采用权函数方法推导出相变对I型裂纹在静止和定常扩展条件下的增韧理论表达式.讨论了泊松比等各个参数对裂纹增韧的影响.算例结果表明,由这种新型屈服准则所计算的相变增韧与实验结果吻合的很好,并且与其他类屈服准则相比更加符合陶瓷材料的实际特点,可以为进一步研究陶瓷相变增韧提供理论支持和借鉴价值.

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