MEASURING INSTRUMENT FOR ELONGATION OF MATERIAL TO BE TESTED

摘要

PURPOSE:To measure the rupture elongation quantity of a material to be tested automatically, by measuring the elongation quantity after a rupture by placing plural probes at a prescribed interval extending over about the overall length of the material to be tested, and calculating a uniform elongation, a local elongation, and a rupture elongation. CONSTITUTION:An extensometer 15 in which for instance, five pieces of probes 141-145 are placed is provided at an equal interval extending over the overall length of a material to be tested 11 which is held between chucking mechanisms 12, 12, an an elongation quantity signal is sent out to an elongation arithmetic part 16. By a tension tester, a tension load is applied until the material to be tested 11 is ruptured, and after it is ruptured, an elongation quantity of each section and the total elongation quantity are measured by the extensometer 15. Also, a uniform elongation is calculated from the former, a local elongation is calculated from said elongation and the latter, and also, from both the elongations, a rupture elongation against a prescribed gauge length is calculated. In such a way, even if a rupture position of the material to be tested cannot be forecast, by rupture elongation can be automatically measured from the elongation quantity after the rupture.