GAUGE AND METHOD FOR MEASURING STRESS INTENSITY FACTOR AND MONITOR APPARATUS FOR RESIDUAL LIFE OF CRACKED MEMBER

摘要

PURPOSE:To measure the stress intensity factor at the leading end part of the crack of a cracked member with high accuracy, by a simple constitution such that two triaxial rosette resistance wire strain gauges are mounted on a gauge base. CONSTITUTION:When two triaxial rosette resistance wire strain gauges 22 are mounted on a gauge base 21 and said gauge base 21 is adhered to a cracked member, the distance between the gauge center of each of the strain gauges and the leading end part of a crack 23 is set within a range of 1/10-3/10 the entire length of the crack 23. The calibration coefficient calculated from the outputs of the strain gauges 22 does not depend on the width of the cracked member, the length of the crack 23 or the angle of inclination of the crack 23 to the cracked member but changes almost linearily corresponding to the change in the distance between the leading end of the crack 23 and the gauge center. Therefore, highly accurate stress intensity factor can be measured easily and stably.