Abstract
The relaxation of clamping force in magnesium alloy AZ91D bolted joint was investigated under the initial clamping force of 5.6 kN at testing temperature of 20, 100 and 125℃. The fiber optic strain gauge was originally introduced to use in the clamping force relaxation test to monitor clamping force in real time. From the experimental results, it is clear that the increase in temperature resulted in the clamping force relaxation. The mismatch of thermal expansion between steel bolt and magnesium alloy joint is suggested to cause the reduction in clamping force induced by compressive creep deformation in magnesium alloy joint.
