FIELD: mechanical engineering. SUBSTANCE: sample for strength test under compression is manufactured in the form of ring which height h, outer diameter D and thickness t are determined from relationship 1,3 ≅ h/t ≅ 1,8 and 30<D/t<130. EFFECT: increased precision of test thanks to reduction of external friction between butts of sample and flat members transmitting compression effort. 1 dwg, 1 tbl
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