Investigation of the Influence of Small Hole on the Fatigue Crack Growth Path
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TECHNICAL ARTICLE—PEER-REVIEWED
Investigation of the Influence of Small Hole on the Fatigue Crack Growth Path Xing-Quan Zhang . Xin Zhang . Long Li . Shi-Wei Duan . Sheng-Zhi Li . Zhi-Lai Huang . Yi-Wei Zhang . Jian-You Feng
Submitted: 20 February 2016 / Published online: 13 April 2016 ASM International 2016
Abstract The goal of this paper is to investigate the fatigue crack growth (FCG) path in 7075-T6 aluminum alloy affected by small hole. The codes ANSYS and FRANC3D are jointly used to compute the stress intensity factors and predict the FCG path. The predicted results show that the fatigue crack turns its growth direction toward the hole. The different locations and sizes of single hole have different influences on the FCG paths, while two symmetrically distributed holes have no effects on the FCG path. The predicted FCG paths are validated by the related FCG test results. Keywords Stress intensity factor (SIF) Fatigue crack growth (FCG) Crack path Hole
Introduction An open hole is a common structural assembly in aircraft manufacturing, which is used to fasten individual parts into the integral structure. For example, metal sheets are fastened by a number of rivets to construct the aircraft skin though fastener holes. Experienced the fatigue loadings during service, the components are easily cracked at place where stress is concentrated due to discontinuous geometry such as hole, voids, and inclusions. To avoid catastrophic accidents, the crack growth accurate accounting is key
X.-Q. Zhang (&) X. Zhang L. Li S.-W. Duan S.-Z. Li Z.-L. Huang Y.-W. Zhang J.-Y. Feng School of Mechanical Engineering, AnHui University of Technology, Ma’anshan 243002, China e-mail: [email protected] L. Li e-mail: [email protected]
technology. The stress intensity factor (SIF) concept has been used to correlate fatigue crack growth rates and to determine the fracture properties of engineering materials [1]. The SIFs are introduced to explain the stress singularities around the crack tip [2–4], and the J-Integral [5, 6] and M-Integral [7, 8] are the widely used to calculate the SIFs. In order to analyze the fatigue behavior of the components under tensile loading, it is necessary to know the SIFs for the different crack fronts and crack sizes that are originated in this geometry throughout the number of cycles [9] The Paris equation is widely employed to predict the fatigue crack growth rate [10]. Recently, there have been lots of attempts to develop new numerical techniques to simulate the fatigue crack growth. Hu et al. [11] employed the method of pseudotractions to calculate the SIFS in materials contained with multiple voids and cracks. Bhardwaj et al. [12] further investigated the effect of multiple defects (holes, voids, inclusions, and minor cracks) on the fatigue life of the interfacial cracked functionally graded materials plate with extended isogeometric analysis. Munoz-abella et al. [13] utilized artificial neutral network to estimate the SIF at the crack front in an unbalanced shaft under rota
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