FRACTAL ANALYSIS OF FRACTURE SURFACE OF WELDING JOINT UNDER LOW CYCLE FATIGUE

Acta Metall Sin

1992, Vol. 28

Issue (11): 32-39 DOI:

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FRACTAL ANALYSIS OF FRACTURE SURFACE OF WELDING JOINT UNDER LOW CYCLE FATIGUE

NI Yushan; CHENG Guangxu; KUANG Zhenbang (Xi'an.iaotong University)

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NI Yushan; CHENG Guangxu; KUANG Zhenbang (Xi'an.iaotong University). FRACTAL ANALYSIS OF FRACTURE SURFACE OF WELDING JOINT UNDER LOW CYCLE FATIGUE. Acta Metall Sin, 1992, 28(11): 32-39.

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Abstract Hausdorff dimension of fracture surface roughness of welding joint, both weld metal and heat-affected zone, of pressure vessel steel 16MnR, tested under strain-controlled low-cycle fatigue, was examined with computer vision system and by two-dimensional variation method. Results show that it decreases with the increase of cyclic hysteresis energy. The Hausdorff dimension variation at heat-affected zone is higher than that of weld metal. It is believed that the higher the fractal dimension is, the longer the fatigue life will be.

Key words: welding joint low-cycle fatigue fractograph Hausdorff dimension

Received: 18 November 1992

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y1992/V28/I11/32

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