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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 5    No. 3    September 1995

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DETERMINATION OF STATES OF STRESS AND STRAIN AT POLE OF HYDRAULIC BULGE ORTHOTROPIC SHEET SAMPLE
Zhou Weixian; Zhou Xin

Department of Aeronautical Manufacturing Engineering; Norrhwestern Polytechnical University; Xi’an 710072

Abstract:The physical characteristics of deformation of the material at the pole of the hydraulic bulge specimen was analysed. Based on this analysis and Hill's hypothesis about the moving track of the material particle of bulge specimen, a method was established to determine the ratio of the two principal stresses at the pole of the orthotropic sheet sample directly from the experimental data, thus to determine the states of stress and strain of the pole. The theoretical value of the ratio stated relates to the yield function used. The application proves that the Hosford type yield function can give better results and is convenient for use.

 

Key words: orthotropic sheet; hydraulic bulge specimen; pole; stress state; strain state

ISSN 1672-7029
CN 43-1423/U

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