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| 高撕裂阻力金属延性断裂韧度测试方法探讨 | |
| 引用本文： | 郝丽丽,果春焕,杨卓青,尹建成,刘瑞堂.高撕裂阻力金属延性断裂韧度测试方法探讨[J].机械强度,2007,29(3):454-458. |
| 作者姓名： | 郝丽丽 果春焕 杨卓青 尹建成 刘瑞堂 |
| 作者单位： | 1. 哈尔滨工程大学,机电工程学院,哈尔滨,150001;北京航空材料研究所,理化室,北京,100095 2. 哈尔滨工程大学,机电工程学院,哈尔滨,150001 3. 哈尔滨工程大学,机电工程学院,哈尔滨,150001;昆明理工大学,材料与冶金工程学院,昆明,650093 |
| 基金项目： | 致谢 本实验得到力学实验中心邹广平教授的大力支持,谨致感谢. |
| 摘 要： | 讨论现行J积分测试方法在测定高撕裂阻力(dJ/da)金属延性断裂韧度JIC时所遇到的困难,结合工业金属冶金组织特性分析裂纹试样受力后的钝化、启裂及裂纹稳态扩展过程,并给出此类材料的JIC测试方法.研究指出,裂纹启裂过程是一个由塑性变形为主导的裂纹顶端伸张变形和裂尖钝化向微孔型断裂过渡的过程;开裂点实际上是在漫长的裂纹前沿上大部分地方完成这一过渡,裂尖伸张区(stretched zone, SZ)达到饱和,微孔开裂机制开始占据主导地位的标志.采用直线和幂函数形式拟合启裂后的J-Δa关系,以及采用幂函数形式拟合启裂前与启裂后全过程的J-Δa关系均可得到很相近的相关性,且在一定程度上,后者显得更合理. |
| 关 键 词： | 延性断裂韧度 高撕裂阻力金属 裂尖钝化 启裂点 伸张区 J-Δa相关性 撕裂阻力 金属 延性断裂韧度 测试方法 METALS RESISTANCE FRACTURE TOUGHNESS DUCTILE MEASURING 程度 相关性 全过程 关系 拟合 函数形式 直线 标志 地位 开裂机制 微孔型 |
| 修稿时间： | 2005-09-162005-12-02 |
APPROACH TO MEASURING DUCTILE FRACTURE TOUGHNESS FOR SOME HIGHER TEARING RESISTANCE METALS |
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| HAO LiLi,GUO ChunHuan,YANG ZhuoQing,YIN JianCheng,LIU RuiTang.APPROACH TO MEASURING DUCTILE FRACTURE TOUGHNESS FOR SOME HIGHER TEARING RESISTANCE METALS[J].Journal of Mechanical Strength,2007,29(3):454-458. | |
| Authors: | HAO LiLi GUO ChunHuan YANG ZhuoQing YIN JianCheng LIU RuiTang |
| Affiliation: | 1. College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China ;2. Beijing Institute Aeronautical Materials, Physical Testing and Chemical Analysis, Beijing 100095, China;3. Faculty of Materials and Metallurgical Engineering, Kunming University of Science and Technology, Kunming 650093, China |
| Abstract: | The difficulties that presented in J integral testing according to current standard test method for some higher tearing resistance metals were displayed. The process from crack blunting, initiation to stable propagation was discussed by analyzing metallurgical structures of commercial alloys. And then, the procedures determining ductile fracture toughness J 1c for such materials have been obtained. The results indicate that the crack initiation is a transition process from stretched deformation arid blunting at the crack tip controlled by plastic deformation to micro-void coalescence fracture. This process proceeds gradually arid continuously arid switches from quantitative change to qualitative change consequently. So-called crack initiation point is actually the moment that this process has been completed widely near long crack front, arid is also the symbol for that the stretched zone has saturated and micro-void coalescence fracture has become predominant. The near relativity can be obtained in relations fitted by linear equation or power function in the stage of stable crack growth and in relations fitted by power function in the whole process of crack blunting and stable growth. But by comparison, the latter is more reasonable seemly. |
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