疲労強度精査におけるreference応力に関する一考察

概要

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The direct calculation method has been spreading over structural design field on ship. It enables us to calculate so fine stress distribution as occasion demands including even the local change of stresses in the vicinity of weld joint at the structural discontinuity. Nevertheless, we are always troubled with how to utilize the FEM output for analysing fatigue strength, because that it has not yet enough established the local approach to the fatigue strength assessment of welded components. Therefore the authors have investigated the crack growth characteristics at round fillet weld toe and proposed a critical crack configuration to be supposed in fatigue design stage. Next, employing a new parameter C(r) given by the necessary number of cycles before the critical configuration and the local stress distribution, several series of fatigue tests were re-analyzed. And it was shown that these series of tests had common C(r) -value only where the distance from weld toe is within about 5mm. Consequently it is practically concluded that the local stress at 5mm away from the weld toe would be appropriate as the reference stress when designing the structural components with similar round fillet welds.
社団法人日本船舶海洋工学会の論文
1992-03-29