Relationship between material pitting and cavitation field impulsive pressures

Choi, Jin-Keun; Chahine, Georges L.

doi:10.1016/j.wear.2016.01.019

Cited by 40 publications

(10 citation statements)

References 28 publications

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“…The mechanical properties of the material, such as the plasticity, vary dynamically with the microjet impact [43] , [44] , [45] . However, the continuous microjet impact suppresses the elastic deformation of the material caused by the residual stress, resulting in a slightly lower pit depth than the experimental results (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Quantitative evaluation of the microjet velocity and cavitation erosion on a copper plate produced by a spherical cavity focused transducer at the high hydrostatic pressure

Xiong

Liu

et al. 2022

Ultrasonics Sonochemistry

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Highlights The Proposed multi-microjet impact model suitable for high hydrostatic pressures. Cavitation erosion experiments can be conducted in an ultrasonic cavitation system composed of a spherical cavity focused transducer with high acoustic energy in a sub-wavelength focal region. Quantitative analysis of cavitation pit morphology can be achieved through the proposed microjet impact model. A microjet velocity inversion model was proposed to quantitative evaluate the cavitation erosion intensity.

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Section: Discussionmentioning

confidence: 99%

Quantitative evaluation of the microjet velocity and cavitation erosion on a copper plate produced by a spherical cavity focused transducer at the high hydrostatic pressure

Xiong

Liu

et al. 2022

Ultrasonics Sonochemistry

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“…In reference [37][38][39][40] Al7075 was used to study cavitation damage and the size characteristics of cavitation pit were obtained. Based on that Al7075 is used as the research material to calculate the micro cutting force of micro-jet and the pit radius is 1-20 μm and the pit depth was 0.05-3 μm.…”

Section: Results and Discussedmentioning

confidence: 99%

Micro cutting force model of micro-jet induced by cavitation collapse in the ultrasonic field at micro-nano scale

Ye¹,

Zhu²,

He³

2021

Preprint

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The micro-jet is the main mechanism of cavitation on materials. More and more ultrasonic cavitation assisted machining uses the micro-jet effect in the industrial field. In this paper, the micro-jet impact is considered as the micro cutting process. To deeply analyze the micro cutting mechanism of micro-jet, the size effect of materials was considered, and the micro cutting force model of micro-jet was established and solved based on the spherical indentation test theory and the strain gradient plasticity theory. The results showed that the micro cutting force and impact pressure of micro-jet with size effect are larger than those without size effect, and the micro cutting force of single micro-jet is within 2.35 N. The micro cutting force of micro-jet increases exponentially with the increase of pit radius, but only slightly increases with the increase of pit depth. When the size effect is considered or not, the impact pressure of micro-jet is 1616-2922 MPa or 1615-1980 MPa, respectively. The increase ratio of micro cutting force with size effect is , which can directly reflect the strength of size effect. The size effect is more obvious when the pit size is smaller, and the maximum increase ratio is 47.54%.The increase ratio increases nonlinearly with the decrease of pit radius and increases with the increase of pit depth. It has a strong correlation with pit radius and pit depth. This paper can provide a new theoretical viewpoint and support for the quantitative description of cavitation effect in ultrasonic assisted machining.

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“…The stress distribution arising due to the impact by an individual shot is described by Hertz's contact stress equation, and the surface roughness due to shot peening has been investigated (Lin et al (2019)). On the other hand, Choi and Chahine (2016) attempted to simulate the shape of the pit and plastic strain induced by a single bubble collapsing using fully coupled bubble dynamics and material response, and Sonde et al (2018) proposed a method to predict the residual stress due to a cloud of bubbles from knowing the distribution of vapor volume fraction in the cavitating flow. However, cavitation bubbles, which are used in cavitation peening, form a cloud consisting of small tiny bubbles and the underlying shapes are longitudinal vortices (Soyama et al (1995)).…”

Section: Introductionmentioning

confidence: 99%

Effect of compressive residual stress introduced by cavitation peening and shot peening on the improvement of fatigue strength of stainless steel

Soyama

Chighizola

Hill

2021

Journal of Materials Processing Technology

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One of the traditional methods used to improve the fatigue properties of metallic materials is shot peening. More recently, cavitation peening, in which the surface is treated using cavitation impact, has been developed, and the improvements this makes to the fatigue life and the strength of metallic materials have been reported. In order to clarify the difference between these two methods, stainless steel SUS316L samples were treated by shot peening and cavitation peening, and the fatigue properties of the samples were evaluated utilizing a displacement controlled plane bending fatigue test. The residual stress and hardness before and after the fatigue test were measured, and the surface roughness of each specimen was also measured. It was concluded that the fatigue life of shot peened specimens at bending stress sa > 450 MPa was longer than that of cavitation peened specimens; however, the fatigue strength of the cavitation peened specimens was slightly larger than that of the shot peened specimens. The compressive residual stress introduced by both peening methods decreased during the fatigue test. The reduction in the compressive residual stress in the shot peened specimens was greater than in the cavitation peened specimens, and after the fatigue test, the compressive residual stress in the shot peened specimens was greater than that in the cavitation peened specimens. It was found that the fatigue strength corresponded well with the yield stress estimated from the Vickers hardness corrected by the residual stress obtained after the fatigue test.

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Relationship between material pitting and cavitation field impulsive pressures

Cited by 40 publications

References 28 publications

Quantitative evaluation of the microjet velocity and cavitation erosion on a copper plate produced by a spherical cavity focused transducer at the high hydrostatic pressure

Quantitative evaluation of the microjet velocity and cavitation erosion on a copper plate produced by a spherical cavity focused transducer at the high hydrostatic pressure

Micro cutting force model of micro-jet induced by cavitation collapse in the ultrasonic field at micro-nano scale

Effect of compressive residual stress introduced by cavitation peening and shot peening on the improvement of fatigue strength of stainless steel

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