Retardation of fatigue crack propagation by indentation technique |
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| Affiliation: | 1. Department of Civil Engineering, Dahan Institute of Technology, Sincheng, Hualien 971, Taiwan, ROC;2. Department of System Engineering, Chung Cheng Institute of Technology, National Defense University, Tahsi, Taoyuan 335, Taiwan, ROC;1. Department of Metallurgical and Materials Engineering, National Institute of Technology Rourkela, Rourkela 769008, India;2. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;1. Department of Mechanical Engineering, University of California, Santa Barbara, Santa Barbara, CA 93106, USA;2. Department of Physics, University of California, Santa Barbara, Santa Barbara, CA 93106, USA |
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| Abstract: | This paper used indentations to retard crack development and thus to prolong the crack growth life. The growth retardation resulting from the indentation-induced strain hardening and the crack closure due to indentation-induced residual stresses were explored. The retardation tests using 3–10 kN indentation loads were performed on different thickness specimens of AISI 4130 low alloy steel and AISI 304 stainless steel. These loads were applied using a hemispherical indenter to both sides of the expected crack path on the specimen surfaces. Loads of 4.5 kN and greater increased the microhardness at and around the indentation position, indicating that at those loads the hardness or the strain hardening contributed to retarding crack growth. In addition, all the loads caused different levels of crack closure. The greater the loads, the stronger were the crack closure effect and the accompanying growth retardation. In the 3.5 mm thick AISI 4130 specimens, a 10 kN load exerted the strongest growth retardation to arrest the post-indentation crack propagation. |
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