Initiation and Propagation Behaviors of Fatigue Cracks in 5056 Aluminum Alloy Studied by Rotating-Bending Tests with Smooth Specimen
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概要
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The fatigue properties of the 5056 aluminum alloy, which is the highest Mg-rich alloy among the commercial Al-Mg alloys and exhibits high work hardening and strain aging, was investigated. Rotating-bending tests using smooth specimens were performed at room temperature with the stress ratio <I>R</I>=-1 and frequency of stress cycle <I>f</I> =55 Hz. The experimental results showed that a distinct fatigue limit as in the case of steel existed on the <I>S-N</I> curve. Surface observations using the replica method revealed a wavy pattern around the second phase particle for <I>N</I>=10<SUP>6</SUP>-10<SUP>7</SUP>, but no non-propagation cracks were observed. It was speculated that the observed fatigue limit appeared as a result of high work hardening rate and strain aging in the heavily deformed zone, and the fatigue cracks did not initiate from this zone up to the maximum number of stress cycle, <I>N</I>=3.5×10<SUP>7</SUP>, in the present study.
著者
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Noguchi Hiroshi
Department Of Anesthesiology And Acute Medicine Aichi Medical University
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AIURA Tadashi
Engineering Department, Aluminum & Copper Business, KOBE STEEL, LTD.
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SHIKAMA Takahiro
Research Section, CHOFU WORKS, Aluminum & Copper Business, KOBE STEEL, LTD.
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YOSHIHARA Shinji
Research Section, CHOFU WORKS, Aluminum & Copper Business, KOBE STEEL, LTD.
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LEE Dongsun
Graduate School of Engineering, Kyushu University
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NOGUCHI Hiroshi
Department of Mechanical Engineering, Faculty of Engineering, Kyushu University
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NOGUCHI Hiroshi
Deparment of Mechanical Engineering, Kyushu University
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YOSHIHARA Shinji
Research Section, CHOFU WORKS, Aluminum & Copper Business, KOBE STEEL, LTD.
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