Manufacturing Technology Today

S. Rasool Mohideen ¹, K. Angamuthu ¹, G. Thanigaiyarasu ¹, R. Rajendran ¹

Affiliations
1 Department of Mechanical Engg., B. S. A. Crescent Engg. College, Chennai, IN

Abstract

Toughness property evaluation of a weldment is art important step in the analysis of welded structures. Many techniques are being employed for the improvement of welded joints' performance and their properties. This paper discusses the influence of cryogenic treatment on the improvement of toughness of weldments. Deep cryogenic treatment was given to the material and its effect on the toughness was studied by a notch tensile test. To investigate its influence, notched tensile test was conducted on the cryogenically treated weldments and post weld heat-treated weldments and the results were compared. Numerical analysis using finite element method was carried out to support the experimental results. Thermo-mechanical coupled field analysis was performed using ANSYS finite element code. It was found that the cryogenic treatment improved the toughness ofthe weld metal arid the heat affected zone (HAZ). The same result was also observed in the finite element analysis even though there was about 8% error between the experimental and finite element analysis.

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T. Raja ¹, G. Thanigaiyarasu ²

Affiliations
1 Mech. Engg. Dept., Sri Venkateswara College of Engg., Sriperumbudur, IN
2 Dept. of Mech. Engg., Anna University, Chennai, IN

Abstract

The effect of forging and ageing on the mechanical properties of matrix composites has been observed. Al6082 reinforced with three different fractions of SiC_p (5%, 10% & 20%, by %wt) in the forged and ageing conditions are studied. The samples were characterized by optical microscopy, hardness test and tensile test. The results show considerable improvements in mechanical properties due to forging and ageing heat treatment of the metal matrix composites.

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K. Shanmuga Sundaram ¹, G. Thanigaiyarasu ²

Affiliations
1 Department of Mechanical Engineering, CEG, Anna University, IN
2 Department of Mechanical Engineering, CEG, Anna University, Chennai-600025, IN

Abstract

Recently, it is well appreciated that the use of FEM analysis to predict any type of phenomenon and behavior without many experimental work are used extensively In all fields. This paper summarizes the literatures on piping elbows focused on the correlation o f finite element analyses with in-plane bending experiments on piping elbows. It also includes the summary of ratcheting experiments on piping elbows. The most powerful FEA non-destructive method of testing in recent scenario has helped to solve many a nonlinear behavior of structures. Ratcheting phenomenon as a material behavior itself is not fully understood. This failure mode as a structural phenomenon in the most elastic piping component-elbows, is not easy to exactly predict. The presence of ratcheting in small size, small radius elbows (2 inch schedule 40) has been experimentally proved but their occurrence is in hoop direction, which is unpredicted. A FEA analysis performed using ABAQUS v6.5 finite element code using Chaboche non-linear kinematic hardening material model on comparison to experimental results summarized in literatures show similar acceptable results. The results are encouraging and may be extrapolated to other conditions to predict the phenomenon. The reasons are discussed in this literature.

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