COMPENSATED DEFLECTION TYPE MATERIAL TESTING MACHINE

摘要

PURPOSE:To obtain stable test data, by a method wherein the relation of the deflection amount of a testing machine to load applied to a test piece is stored while the stress amount of the test piece is calculated from the load applied to said test piece and a test is again repeated after the calculated value reaches a set value. CONSTITUTION:A test piece TP is placed on a lower press plate 7 and, after a cross head speed and the set stress amount (x) of the test piece TP are set from a keyboard 16, the falling indicating button of the cross head is pressed. The operation program of an operation control apparatus 10 calculates a deflection amount DELTAS to load P from the function formula of a memory apparatus 14 and DELTAS is subtracted from the displacement stroke count value C of a counter 12 to calculate the displacement amount S of the test piece TP. When S does not reach (x), a pulse is generated from a pulse generating circuit 11 to return the test piece to the initial step and, when S reaches (x), measurement is again performed after the cross head 6 is stopped for a predetermined time and a test is finished when S again reaches (x). Stable test data is obtained thereby.