| 氧化锆陶瓷Ⅱ-Ⅲ复合型裂纹的综合相变增韧作用 |
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| 引用本文： | 倪新华,路晓波,王俊英. 氧化锆陶瓷Ⅱ-Ⅲ复合型裂纹的综合相变增韧作用[J]. 军械工程学院学报, 2003, 15(1): 67-70 |
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| 作者姓名： | 倪新华 路晓波 王俊英 |
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| 作者单位： | 军械工程学院基础部，军械工程学院科研部，军械工程学院基础部 河北 石家庄 050003，河北 石家庄 050003，河北 石家庄 050003 |
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| 基金项目： | 军械工程学院科学研究基金(YGGXM02001) |
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| 摘 要： | 采用综合相变准则和应变能释放率判据对氧化锆陶瓷Ⅱ-Ⅲ复合型裂纹的增韧结果进行了理论计算。分别给出了静止裂纹和定常扩展裂纹相变增韧的理论表达式。结果表明:综合相变对静止裂纹有微小的负屏蔽效应,对扩展裂纹的增初结果与材料的剪切模量、相变尾区高度和相变体积分数成正比,并且增韧值随着K_Ⅲ/K_Ⅱ比值的增大而减小,表明相变对Ⅱ型裂纹的增韧效果相对Ⅲ型裂纹更显著。
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| 关 键 词： | 综合相变 增韧陶瓷 稳定裂纹 定常扩展裂纹 |
| 文章编号： | 1008-2956(2003)01-0067-04 |
| 修稿时间： | 2002-06-18 |
Toughening Action of Complex Transformation on Mixed Mode n - 1 Cracks in Ceramics |
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| NI Xin - hua LU Xiao - bo WANG Jun - ying. Toughening Action of Complex Transformation on Mixed Mode n - 1 Cracks in Ceramics[J]. Journal of Ordnance Engineering College, 2003, 15(1): 67-70 |
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| Authors: | NI Xin - hua LU Xiao - bo WANG Jun - ying |
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| Abstract: | By the use of the complex transformation criterion and the method of weighted function, the fracture enhancement of mixed - mode II - III crack in transformation toughened ceramics is predicated. The theoretical expressions of the toughening effect for both the stationary and steady - state growing crack are given respectively. The results show there is negative toughening effect for the stationary crack and the toughening for the steady ?state growing crack is associated with the modulus of elasticity, the width of transformation and its volume fraction. The enhancement will decrease when the ratio increases. |
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| Keywords: | complex transformation toughening ceramics stationary crack steady - state growing crack |
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