Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process

Subject Areas : Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering

مهدی تاجداری ¹ (استاد، دانشگاه آزاد اسلامی واحد علوم و تحقیقات مرکزی،گروه مکانیک، اراک، ایران)
حمیدرضا بهاروندی ² (دانشیار، دانشگاه صنعتی مالک اشتر، گروه مواد، تهران، ایران)
علیرضا مرادخانی ³ (کارشناس ارشد، دانشگاه آزاد اسلامی واحد تهران شرق، دانشکده فنی و مهندسی ، گروه مهندسی مکانیک)

Received: 2015-09-28 Accepted : 2015-09-28 Published : 2012-06-21

Keywords: Residual stress, Steel, Shot Peening, Fatigue Test,

Abstract :

In shot peening process the work piece surface is struck by a large number of balls and compressive residual stress is generated on the surface. So, mechanical properties such as fatigue strength, stress corrosion resistance, smooth shape and ... will improve. In this paper, the balls with a speed of 100 to 200 m/s were struck on the steel samples and fatigue strength compared with specimens without shot peening. The results indicated a significant increase in fatigue strength. Also the balls deep changes on the samples were calculated using ANSYS software and the results were compared with the experimental results. Results showed that, if the ball speed is 100 m/s, it leads 25% increase in fatigue strength while the residual stress will increase to 250 MPa. Furthermore, if the ball speed is 200 m/s, fatigue strength and residual stress increase up to 40% and 300 MPa, respectively. It is also concluded that the stress in the balls is twice as the work piece surface residual stress.

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