作者：蔡力勋, 包陈, 金蕾
作者单位：西南交通大学力学与工程学院, 四川成都 610031
关键词：柔度; 断裂力学; 裂纹长度; 标准; 断裂韧性; 疲劳裂纹扩展; 高温; 计算机辅助测试; MTS
摘要：
研究了ASTM、ISO、GB断裂测试规范中推荐的柔度测试技术所存在的不同程度的局部性和系统性问题,提出了修订规范的相关方法和新公式。提出并推荐了应用直通型FFCT(Front-force compact tensile)试样和SEB(Single edged bending)试样的相关延性断裂韧度柔度测试方法和成套新公式;首次发现ASTM E813~E1820、ISO 12135-2002(E)及国标GB2038-91、GB21143-2007关于LLCT(Loading-line compact tensile)试样执行了近三十年的裂纹面旋转柔度修正公式的错误,在给出清楚柔度定义和新图解的基础上提出并推荐了应用FFCT和LLCT试样的柔度修正新公式;讨论了在疲劳裂纹扩展测试中克服COD引伸计惯性力效应的解决方法;研究了直通型CT试样用于高温疲劳裂纹扩展的柔度测试问题,提出了点触式高温柔度测试方法。
Compliance testing technology used for fracture properties of metallic materials: problems and development
CAI Li-xun, BAO Chen, JIN Lei
School of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
Abstract: Based on that there exist local or systemic problems for compliance testing technique recommended in national and international fracture testing standards(GB, ASTM and ISO), a set of methods and formulas were presented and recommended for amendment of the standards.Some new formulas and relative methods used to front-force compact tensile(FFCT) and single edged bending(SEB) specimens based on compliance technique or single specimen method were proposed.Specially, to comprehend compliance correct method recommended in fracture toughness testing standards such as GB21143-2007 and ASTM E1820-06, a reasonable definition of compliance and new rigid-rotational diagrammatic explanation were given, as a result, it manifests that there exists an essential mistake for the compliance correct formula proposed before 30 years and recommended in the current standards of ASTM E1820-06 and ISO 12135-2002(E) or GB 21143-2007, and three kinds of new compliance correct formulas for loading-line compact tensile(LLCT) and FFCT specimens with relation to rotation effect were presented.Finally, a new high-temperature testing method named as point-contact compliance testing technique based on FFCT specimens was proposed for fatigue crack growth testing.
Keywords: Compliance; Fracture mechanics; Crack length; Standard; Fracture toughness; Fatigue crack growth; High-temperature; Compute aided testintg; MTS
2009, 35(1): 9-18 收稿日期: 2008-9-1;收到修改稿日期: 2008-10-8
基金项目:
作者简介: 蔡力勋(1959-),男,教授,博导,长期从事实验固体力学科研与教学工作。
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