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RISS 인기검색어
- 검색키워드
- 저자 : Ravindra K. Saxena (검색결과 2 건)
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Effect of joint design on residual stresses in AISI-304 stainless steel weldment -a numerical study
Yogeshwar Jasra,Sorabh Singhal,Ravindra K. Saxena 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5
Weld joint preparation is an essential factor that affects the performance of the weldment. The effect of joint design under multi-pass shielded metal arc welding of AISI 304 stainless steel is investigated. A thermo-elastic-plastic finite element formulation is developed. The temperature field and residual stresses are validated using experimental data. Root opening and root face are the two prominent factors in the weld joint preparations. The formulation is applied to analyze the effect of these parameters on temperature formation and residual stress. The analysis demonstrates that the increase in the root opening, increases the peak temperature values thereby increases the maximum values of tensile and compressive residual stress. It is observed that the width of the tensile zone increases and that of the compressive zone decreases proportionately with the increase in root opening. It is found that the effect of the root face is not so prominent in comparison to the root opening.
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Bharat Singh,Piyush Singhal,Kuldeep K. Saxena,Ravindra K. Saxena 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.8
The present study aims to evaluate the influence of latent heat effect during phase change in a three-dimensional finite elementnumerical simulation of arc welding. A mathematical model is developed to incorporate the effect of latent heat ofphase transformation using enthalpy formulation. The accuracy of the developed model was initially validated using availableresults in the literature and found consistent prediction. The validated numerical model is used to predict the temperaturedistribution, weld width, depth of penetration, melting efficiency with and without incorporating the effect of latent heat offusion, solidification vaporization. The results obtained from a developed model incorporating the latent heat effect are ingood agreement with the experimentally measured values, whereas a considerable deviation is observed between the predictedvalues and experimental values without considering the effect of latent heat. It is found that without considering the latentheat effect in the model, the mean error is 14%, 24.6%, 22% and 29.6% for peak temperatures, weld width, depth of penetrationand melting efficiency respectively. Therefore, it can be concluded that the effect of latent heat of fusion, solidification,and vaporization is significant for analysis involving phase change and must be accounted for during numerical simulations.
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