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Conditions of stability loss during the test of hydraulic forming of drawpieces. Part I. Derivation of basic equations and relationships

Śloderbach Z.

International Journal of Applied Mechanics and Engineering

2015

Vol. 20, no. 4

917--927

The paper contains two parts. In the first part, basic relationships were derived and some problems connected with stability loss during hydraulic forming of round metallic drawpieces with liquid pressure were discussed. The aim of the considerations is to test drawability of sheets by estimation of acceptable values of plastic strains and the corresponding heights of spherical shells. The analysis was based on some selected real conditions of stability loss. The influence of the coefficient of material hardening for the drawpiece, the coefficient of normal anisotropy and coefficients of plane anisotropy on acceptable values of plastic strains and heights of the formed drawpieces corresponding to the given condition of stability loss was also tested.

Conditions of stability loss during the test of hydraulic forming of drawpieces. Part II. Discussion and analysis of the results

Śloderbach Z.

International Journal of Applied Mechanics and Engineering

2015

Vol. 20, no. 4

928--938

This part of the paper contains the calculation results presented in the form of suitable diagrams and tables. The calculations were made according to the relationships obtained in Part I devoted to a laboratory test of hydraulic forming for some chosen engineering conditions of stability loss. The influence of the coefficient of material hardening, the coefficient of normal anisotropy and the coefficients of plane anisotropy on acceptable plastic strains and heights of the formed drawpieces corresponding to a given condition of stability loss was tested, too.