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Research highligths of sheet metal testing by hydraulic bulging

Tomov B., Gagov V., Yankov E., Radev R.

Journal of Achievements in Materials and Manufacturing Engineering

2011

Vol. 46, nr 1

65--70

Purpose: The aim of this paper is to outline the mechanical conditions when sheet metals are tested by hydraulic bulging as a research background for analysis of the experimental results. Design/methodology/approach: The methodology adopted for this investigation consists in application of the engineering plasticity to a general description of the sheet bulge deformation under lateral hydraulic pressure. Findings: Governing differential equations of hydraulic sheet bulging are found and the current thickness over the bulged dome of the deformed diaphragm is expressed in terms of loading and geometric parameters. Research limitations/implications: The mathematical treatment is limited here to the cases of axial symmetry which assumes that planar isottropic sheet metals are bulged into circular die apertures. Practical implications: Experimental results and other computational models can be analysed in more details comparing them with the derived general mathematical expression. Originality/value: The mechanical state of the sheet bulging is analysed in more general way without any restrictions to the loading rate and to the hydraulic pressure distribution.

Hot closed die forging - State-of-Art and future development

Tomov B.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

443-449

Purpose: This paper presents an overview of the hot close-die-forging (HCDF) and aims at drawing up some new ideas and conclusions about future development of the HCDF. Design/methodology/approach: Exploring the literature survey and the author's experience, the state-of-art of the HCDF is defined. The reason to do this are signs of instability in development of HCDF - a production method, well known due to its advantages, concerning both dimension accuracy and favorable mechanical properties in effect of micro structure changes. Findings: This study shows advantages, possibilities and feature development of the HCDF. Challenges and possible response to them have been discussed. Research limitations/implications: Analyzing the experience gained until now, the possible new research fields have been shown: forging of new materials, new understand ness of near-net forging, combining operations, physical and numerical simulations. Practical implications: HCDF is a production method, well known due to its advantages, concerning both dimension accuracy and favorable mechanical properties in effect of microstructure changes.