| A STATISTICAL INVESTIGATION OF FATIGUE CRACK INITIATION AND GROWTH PROCESS BASED UPON A LARGE SAMPLE SIZE EXPERIMENT |
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| 作者姓名： | Liao Min Tang Ning Yang Qingxiong |
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| 作者单位： | Department of Aircraft Engineering，Northwestern Polytechnical University，Xi'an 710072，China |
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| 基金项目： | The project is supported by the Aeronautic Science Foundation,China |
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| 摘 要： | After finishing 102 replicate constant amplitude crack initiation and growth tests onLyl2-CZ aluminum alloy plate,a statistical investigation of the fatigue crack initiation and growthprocess is conducted in this paper.According to the post-mortem fractographic examination by scan-ning electron microscopy (SEM),some qualitative observations of the spacial correlation among fa-tigue striations are developed to reveal the statistical nature of material intrinsic inhomogeneity duringthe crack growth process.From the test data,an engineering division between crack initiation andgrowth is defined as the upper limit of small crack.The distributions of crack initiation life N.,growthlife N,and the statistical characteristics of crack growth rate da/dN are also investigated.It is hopedthat the work will provide a solid test basis for the study of probabilistic fatigue,probabilistic fracturemechanics,fatigue reliability and its engineering applications.
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| 收稿时间： | 23 October 1995 |
A STATISTICAL INVESTIGATION OF FATIGUE CRACK INITIATION AND GROWTH PROCESS BASED UPON A LARGE SAMPLE SIZE EXPERIMENT |
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| Liao Min Tang Ning Yang Qingxiong.A STATISTICAL INVESTIGATION OF FATIGUE CRACK INITIATION AND GROWTH PROCESS BASED UPON A LARGE SAMPLE SIZE EXPERIMENT[J].Acta Mechanica Solida Sinica,1996,9(1):1-12. |
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| Authors: | Liao Min Tang Ning Yang Qingxiong |
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| Institution: | (1) Department of Aircraft Engineering, Northwestern Polytechnical University, 710072 Xi'an, China |
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| Abstract: | After finishing 102 replicate constant amplitude crack initiation and growth tests on Lyl2-CZ aluminum alloy plate,a statistical investigation of the fatigue crack initiation and growth process is conducted in this paper.According to the post-mortem fractographic examination by scan- ning electron microscopy (SEM),some qualitative observations of the spacial correlation among fa- tigue striations are developed to reveal the statistical nature of material intrinsic inhomogeneity during the crack growth process.From the test data,an engineering division between crack initiation and growth is defined as the upper limit of small crack.The distributions of crack initiation life N.,growth life N,and the statistical characteristics of crack growth rate da/dN are also investigated.It is hoped that the work will provide a solid test basis for the study of probabilistic fatigue,probabilistic fracture mechanics,fatigue reliability and its engineering applications. |
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| Keywords: | crack initiation crack growth statistical nature larse sample size |
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