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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

A study on stress field and fatigue evaluation method of V-notch composite materials with initial cracks

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含初始裂纹的 V 型切口复合材料应力场和疲劳评估方法研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Dec.2024, Vol.47 No.12: 1636-1641, 1692

DOI: 10.3969/j.issn.1003-5060.2024.12.008

Authors

SHEN Wei, GAO Xiang, XU Shuangxi, QIU Yu, CHEN Yuwen

(School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430063, China)

Abstract and Keywords

Abstract: There are numerous notches in structural connections and even microstructures, and stress concentration near the notches can significantly reduce the load-bearing capacity of the structure, seriously affecting its fatigue performance. This paper focuses on the research of notch stress field and fatigue evaluation method of composite structures with notches, deduces the semi-analytical simple formula of V-notch stress field of composite materials with initial cracks, and verifies the simple formula through experiments. It is verified that the simple formula can effectively reflect the stress situation of components, which shows that the simple formula introduced in this paper can accurately predict the stress field and stress intensity factor at the root of notches. Finally, based on the experimental data of crack propagation in V-notch plates, combined with Pairs formula and stress field simplified evaluation formula, a crack propagation model for anisotropic materials with bilateral V-notch components containing initial cracks was fitted.

Keywords: anisotropic materials; initial crack; notch stress field; stress intensity factor; crack propagation model

作者信息

谌伟，高翔，徐双喜，邱屿，陈昱文

（武汉理工大学船海与能源动力工程学院，湖北武汉430063）

摘要和关键词

摘要: 在结构连接甚至微结构中大量存在切口, 切口附近的应力集中现象会明显降低结构的承载能力, 严重影响结构的疲劳性能。文章对含切口复合材料结构的切口应力场和疲劳评估方法进行研究, 推导含初始裂纹复合材料 V 型切口应力场半解析简易公式, 并通过试验验证了简易公式能有效地反映构件的受力情况, 表明该简易公式能精确地预报切口根部应力场和应力强度因子。最后基于 V 型切口板裂纹扩展试验数据, 结合 Pairs 公式和应力场简易评估公式, 拟合得到各向异性材料含初始裂纹的双边 V 型切口构件的裂纹扩展模型。

关键词: 各向异性材料；初始裂纹；切口应力场；应力强度因子；裂纹扩展模型

Funding

国家自然科学基金资助项目（51979209）

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