Stress Relief and Material Properties Improvement Through Vibration VS. Common Thermal Method

Subject Areas : Engineering

S Jafari Mehrabadi ¹ , M Azizmoradi ² , M.M Emami ³

1 - Department of Mechanical Engineering, Islamic Azad University, Arak Branch
2 - Department of Mechanical Engineering, Islamic Azad University, Arak Branch
3 - Machin Sazi Arak Company

Received: 2012-03-10 Accepted : 2012-05-13 Published : 2012-06-30

Keywords: Thermal, Mechanical Properties, Vibration, Stress Releasing,

Abstract :

The goal of this study is investigating reduction of residual stresses from welding carbon steel plates through vibrationstress reliefmethod vs. thermal method. In order to carry out the required experimental tests, carbon steel plates were welded together under specific conditions as samples. Some of the samples were vibration stress relieved, some were thermal stress relieved while the rest remained without any stress relief operation. Several destructive and non-destructive tests were performed on all the stress relieved and non-relieved specimens and the data obtained from these tests were compared in order to reach the optimum vibration effect on stress relieved welded joints. The results attained for vibration method indicated an acceptable amount of reduction of residual stresses in the joints. In addition, some improvements in mechanical properties achieved vibration stress relief method were used.

References:

[1] McGoldrick R.T., Captain Harold E., 1943, Some experiments in stress relieving casting and welded structures by vibration, Journal of the American Society of Naval Engineers 55(4): 589-609.

[2] Dawnson R., Moffat D.G., 1980, Vibratory stress relief and fundamental study of its effectiveness, Journal of Engineering Materials and Technology 102(2):169-176.

[3] Shankar S., 1982, Vibratory stress relief in mild steel weldments, A Dissertation submitted to the faculty of Oregon Graduate center in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

[4] Luh G.C., Hwang R.M., 1998, Evaluating the effectiveness of vibratory stress relief by a modified hole – drilling method, The international Journal of Advanced Manufacturing Technology 14(11):815-823.

[5] Aoki Sh., Nishimura T., Hiroi T., 2005, Reduction method for residual stress of welded joint using random vibration, Journal of Nuclear engineering and design 235(14):1441-1445.

[6] Robbins M.E., 2004, Topics in vibratory stress relief of weldments, A Seminar submitted to the faculty of Rensselaer at Hartford in partial fulfillment of the requirements for the degree of Master of Science, Applied Composite Material 16:321-330.

[7] Aoki Sh., Nishimura T., Hiroi T., Hirai S., 2006, Reduction method for residual stress of welded joint using harmonic vibrational load, Journal of Nuclear engineering and design 237(2):206-212.