Method of arresting fatigue crack growth in metal member, and fatigue crack growth-arrested metal member
AssigneeIHI Corporation
InventorMasashi Mouri
Life of this patent
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Abstract
In a method of arresting fatigue crack growth in a metal member, a hole is formed beside a tip portion of a fatigue crack with respect to a crack extension direction, in a metal member body, in which the fatigue crack occurs due to an action of applied cyclic tensile stress. Then, a press-fit object being higher in stiffness than the metal member body and larger in external size than the hole is press-fitted into the hole. Compressive stress is made to act on the tip portion of the fatigue crack from directions lateral to the crack extension direction.
Claims14
A method of arresting fatigue crack growth in a metal member, comprising:
- a hole forming step of forming a hole in a metal member body in which a fatigue crack occurs due to an action of applied cyclic tensile stress, the hole arranged beside a tip portion of the fatigue crack with respect to a crack extension direction;
- and
- a press-fitting step of making compressive stress act on the tip portion of the fatigue crack from a direction lateral to the crack extension direction by press-fitting a press-fit object into the hole, the press-fit object being higher in stiffness than the metal member body and larger in external size than the hole.
A fatigue crack growth-arrested metal member, comprising:
- a hole formed in a metal member body in which a fatigue crack occurs due to an action of applied cyclic tensile stress, and provided beside a tip portion of the fatigue crack with respect to a crack extension direction;
- and
- a press-fit object being higher in stiffness than the metal member body and larger in external size than the hole, and configured to make compressive stress act on the tip portion of the fatigue crack from a direction lateral to the crack extension direction by being press-fitted into the hole.
Dependencies are inferred from the claim text.