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首页> 外文期刊>International Journal of Fatigue >Fatigue damage evaluation of low-alloy steel welded joints in fusion zone and heat affected zone based on frequency response changes in gigacycle fatigue
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Fatigue damage evaluation of low-alloy steel welded joints in fusion zone and heat affected zone based on frequency response changes in gigacycle fatigue

机译:基于千兆周疲劳频率响应变化的低合金钢焊接接头在熔合区和热影响区的疲劳损伤评估

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摘要

The fatigue crack propagation lives of low alloy steel in the heat affected zone (HAZ) and fusion zone (FZ) were estimated based on the frequency response changes in ultrasonic fatigue, which varied with the crack size during fatigue. Results showed that more than 99% of the total fatigue life was occupied by the crack initiation process for HAZ in gigacycle fatigue. However, this number was scattered for FZ specimen owing to the crack propagation from welding defects directly. A nonlinear fatigue model based on natural frequency changes was developed, which described fatigue damage for HAZ and FZ specimens successfully.
机译:根据超声疲劳的频率响应变化估计低合金钢在热影响区(HAZ)和熔合区(FZ)中的疲劳裂纹扩展寿命,疲劳强度随裂纹尺寸的变化而变化。结果表明,在千兆周期疲劳中,热影响区的裂纹萌生过程占据了总疲劳寿命的99%以上。然而,由于直接从焊接缺陷产生的裂纹扩展,这个数量对于FZ试样是分散的。建立了基于自然频率变化的非线性疲劳模型,该模型成功地描述了HAZ和FZ试样的疲劳损伤。

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