Abstract
Effect of creep deformation on the tightening behavior of nonferrous bolt was studied in order to understand the tightening performance of nonferrous bolt in various conditions. Creep test under 100 degrees of Celsius was conducted for two kind of magnesium bolt, AZ31 and AZX912. The results show that the elongation of bolt after 45 h from the test start was 0.74 mm in AZ31, and that was 0.19 mm in AZX912. It is shown by a simple numerical analysis for the changes in tightening force with time that the tightening force after 5000 h from the start in AZ31 decrease to 6 % of the initial force, and that after 9000 h from the start in AZX912 decrease to 9 % of the initial force.
