Material testing machine and control method of material testing machine

摘要

PROBLEM TO BE SOLVED: To enable accurate calculation of control compliance even by using a physical quantity measured in a short period of time, and to enable more accurate feedback control of a load mechanism 12. SOLUTION: A material testing machine 1 has a load mechanism 12, an encoder 20 for measuring a moving distance of a cross head 10, an extensometer 90 for measuring an elongation amount P of a test piece TP, and a moving distance of the cross head 10. The first slope calculation unit 541 that calculates the first slope that is the slope of the approximate straight line that represents the time change, and the second slope calculation unit 542 that calculates the second slope that is the slope of the approximate straight line that represents the time change of the elongation amount P. A control compliance calculation unit 543 that calculates the ratio of the first inclination to the second inclination as control compliance, and a feedback control unit 544 that feedback-controls the load mechanism 12 based on the control compliance calculated by the control compliance calculation unit 543. , Equipped with. [Selection diagram] Fig. 1