NONPROPORTIONAL CYCLIC PLASTICITY OF NORMALIZED STEEL 16Mn

Acta Metall Sin

1993, Vol. 29

Issue (10): 1-9 DOI:

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NONPROPORTIONAL CYCLIC PLASTICITY OF NORMALIZED STEEL 16Mn

PENG Xianghe;GAO Zhihui;MA Mingtu;YAN Zaixian Chongqing University Chongqing Institute of Automobile

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PENG Xianghe;GAO Zhihui;MA Mingtu;YAN Zaixian Chongqing University Chongqing Institute of Automobile. NONPROPORTIONAL CYCLIC PLASTICITY OF NORMALIZED STEEL 16Mn. Acta Metall Sin, 1993, 29(10): 1-9.

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Abstract An experimental investigation was carried out of the flow characteristic andhardening of normalized steel 16Mn subjected to biaxially nonproportional cyclic straining.For a fixed cyclic strain path, the steel behaves mainly cyclic softening when the amplitude ofstrain is small. While with the increase of strain amplitude, the softening disappears gradually,and even changes to cyclic hardening for certain strain path. The hardening of the steel mayrelate to the shape of strain path under nonproportional cyclic straining. Experimental resultsshow that there exists a coupling between the hardening/softening induced by strainamplitude and that by the strain path. The memory of the steel to the history ofnonproportional cyclic hardening and the validity of Lensky's hypothesis of localdeterminability were also examined.

Key words: steel 16Mn nonproportional cyclic straining plastic flow hardening

Received: 18 October 1993

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