Analysis of the Vibrational Stress Relief for Reducing the Residual Stresses Caused by Machining

Vardanjani, Mehdi Jafari; Ghayour, Mostafa; Homami, Rasool Mokhtari

doi:10.1111/ext.12109

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…In vibratory machining, yet another processes used in this case, vibration energy penetrates into the metal and, as a result, into the polycrystalline material and crystal displacement takes place, which is accompanied by a change in the distribution of stresses (Vardanjani et al, 2016 ). It has been pointed out (Khan and Gangele, 2016;Świć, 2009) that oscillations should occur at a resonant frequency or close to it.…”

Section: Vibratory Stabilisationmentioning

confidence: 99%

Design of The Vibrostabilisation Stand For Reducing Residual Stresses in Discs Used In The Construction of Multi-Plate Clutches and Brakes

Jaroszewicz

Łukaszewicz

Antonyuk

2019

Acta Mechanica Et Automatica

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Heavy-duty, oil-cooled brake discs (MMOTs) are often used in heavy-duty brake systems manufactured by companies such as Caterpilar, Clark, Komatsu and Liebherr. These discs are usually made of special steels, and in most cases, the flatness of the working surfaces should not exceed 0.15–0.30 mm. Although the technological processes of friction disc production include several stages of heat treatment and grinding, the required accuracy is not achieved in some cases. In addition, the remaining residual stresses lead to the deformation of the discs during their lifetime. In production practice, three methods are used to reduce residual stresses: thermo-fixing, dynamic stabilisation and vibratory stabilisation consisting in bringing discs to transverse resonance vibrations and maintaining resonance until significant stress reduction. The article proposes a method of stabilising the discs using the resonance phenomenon at the first few frequencies. In this article, Cauchy’s function method and characteristic series method are used to develop solution value problem for clamped circular plates with discrete inclusions as concentrated masses and springs. Calculation methods for quick estimation of the own frequency of discs with additional ring mass enabling the use of low power vibration inductors are presented. The use of a special membrane and a pneumatic cushion in the construction of the stand allows to induce vibrations of higher frequencies.

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Section: Vibratory Stabilisationmentioning

confidence: 99%

Design of The Vibrostabilisation Stand For Reducing Residual Stresses in Discs Used In The Construction of Multi-Plate Clutches and Brakes

Jaroszewicz

Łukaszewicz

Antonyuk

2019

Acta Mechanica Et Automatica

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“…They believed that low amplitude VSR has positive influences on the fatigue whereas high amplitude VSR has negative influences. M. Jafari et al [12] proposed a mathematical model based on plasticity theorem with linear kinematic hardening to explain the mechanism of reduction of residual stresses of materials experiencing cyclic loading. The numerical results from the mathematical model and the analytical results with existing experimental data for rectangular cross-section beams showed a similar trend.…”

Section: Introductionmentioning

confidence: 99%

FES of the effect of free vibration treatment on fatigue damage recovery for notched copper film

Zhang

Shang

2018

MATEC Web Conf.

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In this paper, finite element simulation (FES) of the effect of free vibration treatment on fatigue damage recovery for notched copper film with the thickness of 33 um was investigated. The damage process analyzed by static analysis of original specimen and vibration process analyzed by transient dynamic analysis of damaged specimen were simulated respectively. The transient dynamic analysis was conducted with different frequencies and acceleration amplitudes. It is found that the plastic strain was produced as a result of cyclic loading and reduced after the vibration treatment. The values of plastic strain are different after treatment with different vibration frequencies and acceleration amplitudes. Furthermore, the plastic strain in notch reduces more than that of other areas of the specimen. According to the analysis, the vibration treatment can reduce the plastic strain of notched specimen significantly by which the microproperties are improved so that fatigue damage can be recovered.

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Experimental and numerical analysis of shunting effect in resistance spot welding of Al2219 sheets

Vardanjani¹,

Araee²,

Senkara³

et al. 2016

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. Few aspects of shunting effect have been studied so far. Shunting effect in resistance spot welding (RSW) occurs when the electrical current passes through the previous spot welds. Value of this current depends mostly on distance, number, and size of previous spot welds. This will cause some dimensional and metallurgical changes in welding nugget as well as heat affected zone (HAZ). In this study, shunting effect of RSW is considered by finite element method (FEM) and the results are compared to experiments performed on aluminum alloy 2219. Weld spacing together with welding current and time are considered to discover the effect of shunting current in the final quality of nugget. A three factor experiment design has been performed to find the significance of factors and interactive effects, as well as finite element model verification. Electrothermal and mechanical interactions are considered in the FEM. Experimental and numerical solutions have yielded similar results in terms of welding nugget properties. Asymmetry in electrical potential, temperature, stress distribution and geometry of shunted nugget is predicted and verified directly or indirectly. Intense effect of shunting current on nugget height, asymmetric growth of heat affected zone (HAZ) toward previous welding nugget, as well as concentration of alloying elements along grain boundaries are also discovered. Kim et al. [17]). Although most of these studies have included thermal, electrical and mechanical aspects of the RSW process, the asymmetry of shunting configuration due to existence of shunting (previous) nugget prohibits the use of 1D or 2D axisymmetric models.In this paper, shunting effect in RSW is investigated using FEM and the results are compared with experiments on AA2219. The influence of welding distance, current and time are investigated to consider shunting effect in final quality of the nugget. Experiments are designed inside the weldability range, while the results are compared to results of FEM after verification. have included thermal, electrical and mechanical aspects shunting configuration due to existence of shunting (prev 2D axisymmetric models. MethodsIn this paper, shunting effect in RSW is investigated using with experiments on AA2219. The influence of welding d investigated to consider shunting effect in final quality of inside the weldability range, while the results are compar

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Analysis of the Vibrational Stress Relief for Reducing the Residual Stresses Caused by Machining

Cited by 3 publications

References 16 publications

Design of The Vibrostabilisation Stand For Reducing Residual Stresses in Discs Used In The Construction of Multi-Plate Clutches and Brakes

Design of The Vibrostabilisation Stand For Reducing Residual Stresses in Discs Used In The Construction of Multi-Plate Clutches and Brakes

FES of the effect of free vibration treatment on fatigue damage recovery for notched copper film

Experimental and numerical analysis of shunting effect in resistance spot welding of Al2219 sheets

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