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Study of Next Cavitation Shotless Peening

次空化无喷丸喷丸技术研究

基本信息

批准号：
14350049
负责人：
SOYAMA Hitoshi
金额：
$ 9.34万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

The main results obtained are as follows :1.The cavitating jet in air was observed and it was revealed that the periodical cavitation-cloud-shedding around the high-speed water jet and the fluctuation of the low-speed water jet were interfered each other.2.Pure aluminum specimen was treated by the cavitation shotless peening. It was revealed by means of recrystallization-etch technique that the plastic deformation was induced by the cavitation shotless peening.3.The cavitation impacts energy was measured by the cavitation impact counter. It was revealed that the cavitation impacts induced by the cavitating jet in air were more intense compared with that of the cavitating jet in water.4.The stress distribution of cavitation impacts was estimated by the shape of plastic deformation pits. In order to apply the cavitation shotless peening to tribology area, the introduction of compressive residual stress into titanium alloy was revealed.5.In order to establish monitoring method of cavitation shotless peening, the relation between the impact energy measured by the PVDF sensor and the vibration measured by the laser doppler velocity meter were revealed.6.The proposed shotless peening and the conventional shot peening were compared. The difference of the peening methods in view point of introduction of compressive residual and the improvement of fatigue strength was revealed.7.In order to control the cavitation impact intensity, the plastic deformation pits produced by cavitation shotless peening were measured precisely. The pressure distribution of cavitation impact was successfully controlled by the injection pressure of the low-speed water jet and the standoff distance.8.The injection pressure of the low-speed water jet and the standoff distance, which were the main parameters of the cavitation shotless peening, were optimized.

主要研究结果如下：1.对空气中的空泡射流进行了观察，发现高速水射流周围的周期性空泡云脱落与低速水射流的脉动相互干扰。2.对纯铝试样进行了空泡无喷丸处理。通过再结晶-刻蚀技术揭示了空蚀无喷丸产生塑性变形的原因。3.利用空蚀冲击计数器测量了空蚀冲击能量。结果表明，空泡射流在空气中产生的空泡冲击比在水中产生的空泡冲击更强烈。4.根据空泡冲击产生的塑性变形坑的形状来估计空泡冲击的应力分布。为了将空蚀无喷丸技术应用于摩擦学领域，揭示了空蚀无喷丸技术在钛合金中引入了残余压应力; 5.为了建立空蚀无喷丸技术的监测方法，揭示了PVDF传感器测量的冲击能量与激光多普勒测速仪测量的振动之间的关系; 6.将空蚀无喷丸技术与常规喷丸技术进行了比较。揭示了不同喷丸方法在引入压缩残余和提高疲劳强度方面的差异。7.为了控制空蚀冲击强度，对空蚀无喷丸产生的塑性变形坑进行了精确测量。利用低速水射流喷射压力和射距成功地控制了空蚀冲击的压力分布。8.对空蚀喷丸的主要参数低速水射流喷射压力和射距进行了优化。