ろう接継手の疲労強度におよぼす接合間隙の影響

抄録

The effects of joint clearance on fatigue crack initiation life and crack growth rate of brazed joint were investigated.
Tes tspecimens used were butt joint of carbon stcel and stainless steel brazed with pure copper with/without an artificial defect in joint.
It was inferred from the fatigue test results that fatigue life of joint depend not on crack growth rate but on crack initiation time.
From these test results and the theoretical investigations on the restraining effect of basemetals on plastic slip of filler metal and crack tip plastic deformation in joint, the mechanisms how joint clearance affects on fatigue life of brazed joint were made clear.