Non-linear effects of high-power ultrasonics in crystalline solids

Green, R.E.

doi:10.1016/0041-624x(75)90063-3

Cited by 34 publications

(6 citation statements)

References 23 publications

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“…A variable residual effect on hardness can also be expected after the application of the process, depending on various factors, such as the vibration amplitude or frequency, or the material on which it is applied [11]. For that reason, the effects of vibration-assisted ball burnishing (VABB) must be assessed on different materials and under different circumstances to understand what the actual implications of the process itself are.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Strengthening in S235JR Steel Sheets through Vibration-Assisted Ball Burnishing

Llumà

Gómez-Gras

Jerez-Mesa

et al. 2020

Metals

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The superficial effect of hardening caused after vibration-assisted ball burnishing and its consequences in the tensile behavior of a carbon steel material are studied in this paper. As ball burnishing affects the material to hundredths of micrometers in depth through plastic deformation, the overall macro effect of this modification was studied. Different levels of preload and vibration amplitude were studied to address the described issue. The study was done in two phases. First of all, the depth to which ball burnishing affects the material was studied by performing Vickers indentation tests with different loads. It was proven that the effects of ball burnishing are best represented when a 0.05 kg load is used, as higher loads include more volume of core material in the measurement, hence hiding the effect of ball burnishing. In a second phase, the ball burnished specimens were subjected to tensile tests. It was proven that an increase of burnishing preload diminishes the ductile behavior of the material and increases its strength representative values, although the proportion of affected material in the cross-section of the specimen is reduced with regard to the whole surface. Additionally, as the preload increases, the effects of assistance through vibrations is reduced, and the effect of the static preload acquires more relevance in modifying the macroscopic mechanical properties of the steel alloy. Experiments using different amplitudes and new forces are encouraged to obtain more information about how the material can be modified optimally through vibration-assisted ball burnishing.

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Section: Introductionmentioning

confidence: 99%

Mechanical Strengthening in S235JR Steel Sheets through Vibration-Assisted Ball Burnishing

Llumà

Gómez-Gras

Jerez-Mesa

et al. 2020

Metals

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“…Compared to traditional plastic forming, ultrasonic vibration forming significantly reduces flow stress of the material, improves material forming limit and product quality [9]. Green [10] performed various experiments to study the effect of the ultrasonic energy during deformation of different materials. He found that the ultrasonic energy intensity is proportional to the reduction of the yielding strength.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of forming forces in ultrasonic incremental sheet metal forming

Liu

et al. 2017

Aerospace Science and Technology

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In this paper, a new type of sheet metal forming technology using ultrasonic vibration applied to SPIF (single point incremental forming) process is presented. Forming force during forming process can induce fracture and affect accuracy of the sheet metal. Design of ultrasonic sheet metal forming equipment can be based on this study, which takes into account magnitude and changing law of the forming force. ABAQUS finite element software was used to simulate and analyze influence of different frequencies and amplitudes of ultrasonic vibration on the forming force in single point incremental forming process. Results show that ultrasonic vibration can reduce forming force and improve surface quality of the forming process. In addition, an experimental system using ultrasonic single point incremental forming was designed. Effect of the amplitude on ultrasonic vibration was studied experimentally. Experimental results were consistent with the result from finite element simulation.

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“…Researchers have confirmed the useful effect of ultrasonic (US) energy on the deformation behaviour of metals and alloys. 18–35 Thus, it seems that improving ISMF by applying US vibration is essential. No attempts have been made to study the effect of US vibration on ISMF.…”

Section: Introductionmentioning

confidence: 99%

“…Green 26 conducted various deformation tests on different materials to study the effect of US energy. Consequently, the acoustic softening phenomenon was observed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the ultrasonic vibration effect in incremental sheet metal forming process

Vahdati

Mahdavinejad

Amini

2015

Proceedings of the Institution of Mechanical Engineers, Part B:

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The mechanism of incremental sheet metal forming is based on plastic and localized deformation of sheet metal. The sheet metal is formed using a hemispherical-head tool in accordance with the path programmed into the computer numerical control milling machine controller. Experimental and numerical analyses have been performed previously on the application of ultrasonic vibration to various metal forming processes. However, thus far, the effects of ultrasonic vibration on incremental sheet metal forming have not been investigated. This article presents the process of design, analysis, manufacture and testing of a vibrating forming tool for the development of ultrasonic vibration–assisted incremental sheet metal forming. The results obtained from modal analysis and natural frequency measurement of the vibrating tool confirmed the emergence of a longitudinal vibration mode and resonance phenomenon in the forming tool. Then, the effect of ultrasonic vibration on incremental sheet metal forming was studied. The obtained experimental results from the straight groove test on Al 1050-O sheet metals showed that ultrasonic vibration led to decrease in the following parameters as compared with conventional incremental sheet metal forming: applied force on forming tool axis, spring-back and surface roughness of formed sample.

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Non-linear effects of high-power ultrasonics in crystalline solids

Cited by 34 publications

References 23 publications

Mechanical Strengthening in S235JR Steel Sheets through Vibration-Assisted Ball Burnishing

Mechanical Strengthening in S235JR Steel Sheets through Vibration-Assisted Ball Burnishing

Evaluation of forming forces in ultrasonic incremental sheet metal forming

Investigation of the ultrasonic vibration effect in incremental sheet metal forming process

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