Abstract
This paper describes apparatus used to investigate materials under hydrostatic pressure and chiefly the dynamometer put into the pressure chamber which enables measurement of the axial load while stretching or compressing specimens under pressure of up to 30 000 kg/cm2. This dynamometer creates possibilities for recording the full load-extension curve of the specimen stretched under pressure. The pressure value and the elongation of the specimen are also recorded in the same time.
The recording method described also enables the stretching process to be interrupted at any desired moment to study the effect of the stress state on initiation and propagation of cracks.
Some load–extension curves for cast iron, Armco iron and copper are presented.
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