| 摘要 |
PROBLEM TO BE SOLVED: To provide a method different from a conventional method for improving fatigue strength, that is, a new working method for improving the fatigue strength by bending. SOLUTION: The method for improving the strength of a member is provided for improving the fatigue strength of the specific portion of the member by acting compressive stress thereon. The method utilizes the fact that application and removal of load to and from the load-to-be-applied portion of the member different from the above specific portion causes the compressive stress to act on the specific portion due to the elastic recovery force of the load-to-be-applied portion, and the method includes: a first step of applying the load to the load-to-be-applied portion of the member; and a second step of removing the load having been applied to the load-to-be-applied portion in the first step, from the load-to-be-applied portion to cause the load-to-be-applied portion to produce force acting in a direction reverse to the direction of the load having been applied in the first step due to the elastic recovery force of the load-to-be-applied portion. COPYRIGHT: (C)2008,JPO&INPIT
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