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首页> 外文会议>ASME(American Society of Mechanical Engineers)/JSME Pressure Vessels and Piping Conference: Elevated Temperature Design and Analysis, Nonlinear Analysis, and Plastic Components; 20040725-20040729; San Diego,CA; US >Improvement of Fatigue Strength by Using Cavitating Jet in Air
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Improvement of Fatigue Strength by Using Cavitating Jet in Air

机译：利用空化射流提高疲劳强度

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Cavitation normally causes severe damage in hydraulic machinery such as pumps and valves. However, the cavitation impacts at the bubble collapse can be used to enhance the surface of metallic materials just as the same way as shot peening. In case of peening using cavitation impact, the cavitation is produced by injecting a high-speed water jet in a water-filled chamber. The authors have already demonstrated the fatigue strength improvement of materials using a highspeed water jet in water. Recently the authors succeeded in producing a cavitating jet in air by injecting a high-speed water jet into a low-speed water jet using a concentric nozzle. Cavitating jet in air can be used to peen parts of plant which cannot peened by the water-filled chamber, thereby impeding the initiation and/or the development of cracks. In this study, in order to demonstrate the improvement of fatigue strength of materials using cavitating jet in air, stainless steel (JIS SUS316L) was peened and the residual stress measured using the X-ray diffraction method. The surface residual stress of non-peened and peened specimen was -68 MPa and -350 MPa, respectively. The fatigue strength of the specimen were then investigated using the rotating bending fatigue test, with a stress ratio of R = -1. The fatigue strength of peened specimen by cavitating jet in air improved by 20% compared with non-peened specimen.
机译：空化通常会严重损坏液压机械，例如泵和阀门。但是，与喷丸处理一样，气泡破裂处的气穴冲击可用于增强金属材料的表面。在使用气蚀冲击进行喷丸的情况下，通过在充满水的室内注入高速喷水来产生气蚀。作者已经证明了在水中使用高速喷水可以提高材料的疲劳强度。最近，作者通过使用同心喷嘴将高速水射流注入到低速水射流中，成功地在空气中产生了空化射流。空气中的空化射流可用于刺入无法被充满水的腔室喷丸的植物部分，从而阻止裂缝的产生和/或发展。在这项研究中，为了证明使用空化射流改善材料的疲劳强度，对不锈钢（JIS SUS316L）进行了喷丸处理，并使用X射线衍射法测量了残余应力。未喷丸和喷丸试样的表面残余应力分别为-68 MPa和-350 MPa。然后使用旋转弯曲疲劳试验研究样品的疲劳强度，应力比为R = -1。与未喷丸的试样相比，通过空化射流对喷丸的试样的疲劳强度提高了20％。

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