mechanical  analysis  of  tensile  instability  due  to  only  material  parameter

Acta Metall Sin

2006, Vol. 42

Issue (4): 337-340 DOI:

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mechanical analysis of tensile instability due to only material parameter

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吉林大学超塑性与塑性研究所

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;. mechanical analysis of tensile instability due to only material parameter. Acta Metall Sin, 2006, 42(4): 337-340 .

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Abstract Instabilities during superplastic deformation is more complicated than those during plastic deformation. Many valuable papers about mechanical analysis of instability have been published at home and abroad, which contributed much to the development of superplastic research. But their conclusions were different because of the diversity of the researchers’ thoughts and methods. Therefore, it is necessary to normalize these theories. In order to study the impact of material’s mechanical parameter on instability, tensile instability criterion of specimen without geometric defect at constant temperature, that is due to only material parameter, was analyzed based on state equation of deformation in this paper. The results not only coincided with those in some typical papers, but also proved theoretically that, during superplastic deformation, geometrical instability will happen after a period of uniform deformation which follows load instability, rather than in the mean time of load instability.

Key words: Superplasticity specimen without geometric defect constant temperature tensile instability criterion

Received: 17 January 2006

ZTFLH:

TG113.25

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I4/337

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