Test piece rupturing force measurement equipment - using lasers to measure speed of rupturing ram immediately before and after impact with test piece

摘要

A heavy mass (2) and blade (3) may after unlatching fall freely on to a test piece (5) supported by an anvil (4). The falling mass and blade (2,3) are guided by vertical rails (1a) and their travel is terminated by dampers (6). Two pairs of diode laser emitters and photodiode receivers are located just above (10,11a, 11b) and just below (20,21a,21b) the test piece (5). The time required for the mass (3) to travel a predetermined distance, d enables the speeds and energies before and after impact to be calculated and hence the rupture energy to be obtd. by difference. ADVANTAGE - Accurate, need to carry instrumentation on blade is avoided.