EVALUATION METHOD FOR RESIDUAL AXIAL FORCE OF CORRODED HIGH-STRENGTH BOLTS BASED ON THICKNESS REDUCTION

Abstract

This paper investigates the reduction of axial force in corroded high-strength bolts. FEA revealed that the root mean squared value of the thickness reduction was a useful parameter for evaluating the residual axial force for the corroded bolts. Furthermore, the effect of corroded bolt shape on the residual axial force was examined by using FE models based on 3D scanning result. To improve the accuracy of residual axial force measurement, the correction formula which consider the thickness reduction of bolt head on the axial force measurement was proposed. The proposed evaluation method indicated that the residual axial force can be estimate with the accuracy of ±15%.