类岩石脆性材料非闭合裂纹的Ⅰ-Ⅱ压剪复合型断裂准则研究

李部; 黄润秋; 吴礼舟

doi:10.11779/CJGE201704010

类岩石脆性材料非闭合裂纹的Ⅰ-Ⅱ压剪复合型断裂准则研究 English Version

成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都 610059

基金项目: 国家科学自然基金重点项目（41130745）; 国家基础研究计划（“973”计划）项目（2013CB733202）; 四川省青年科技创新研究团队项目（2015TD0030）

详细信息

作者简介:
李部(1990- ),男,博士研究生,主要从事岩土力学与工程地质方面的研究。E-mail：lbcdut@foxmail.com。

通讯作者:
吴礼舟，E-mail：wulizhou07@cdut.cn

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出版历程
- 收稿日期: 2016-01-04
- 发布日期: 2017-05-19

Compression-shear fracture criteria for mixed mode I-II of open crack of rock-like brittle materials

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 实际工程中,结构体裂纹常处于拉剪和压剪复合受力状态,研究适合于复合型裂纹的断裂准则和裂纹扩展机理具有重要的理论意义和实用价值。以Ⅰ-Ⅱ复合型裂纹为研究对象,基于线弹性理论,在考虑裂纹几何特征及受力形式的基础上,系统介绍了裂纹应力强度因子（SIF）的理论解。提出了适用于Ⅱ型断裂的径向剪应力准则和双剪应力准则。对于Ⅰ-Ⅱ复合型裂纹,提出用等效Ⅰ、Ⅱ型SIF比值与Ⅰ、Ⅱ型断裂韧度比值的关系判定裂纹断裂类型,并分别选择适合于Ⅰ、Ⅱ型断裂的断裂准则,计算了裂纹断裂扩展理论角度。理论断裂角与预制非闭合裂纹类岩石脆性材料压剪断裂试验结果符合得较好。
- 非闭合裂纹 /
- Ⅰ /
- -Ⅱ /
- 复合型断裂 /
- 应力强度因子 /
- 准则
Abstract: In practical projects, structural fracture often undergoes complex stresses. The studies on the fracture mechanism of mixed mode cracks are of important theoretical significance and practical implication. Based on the mixed I - II crack mode and the linear elastic theory, the geometrical characteristics and stress form of cracks are considered, and the theoretical solution of the stress intensity factor (SIF) at the crack tip is introduced. The radial shear stress criterion and the twin shear stress criterion for mode II fracture are put forward. For the I - II mixed-mode open crack, a new method to determine the fracture type is proposed by comparing the SIF ratio of equivalent mode I and II with that of mode I and II fracture toughness. In addition, an appropriate fracture criterion for mode I or II fracture is used to calculate the theoretical initiation angle. The compression-shear fracture tests on the brittle rock-like samples with a single open pre-crack are carried out under compression. The results indicate that the theoretical initiation angles and the experimental results are in good agreement.
- open crack mixed /
- I- II fracture mode /
- stress intensity factor /
- criterion /
- undefined /
- undefined

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参考文献(29)

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