Tajdari, M., Baharvandi, H., Moradkhani, A. (2012). Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 5(1), 19-29.
Mehdi Tajdari; Hamid Reza Baharvandi; Ali Reza Moradkhani. "Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 5, 1, 2012, 19-29.
Tajdari, M., Baharvandi, H., Moradkhani, A. (2012). 'Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 5(1), pp. 19-29.
Tajdari, M., Baharvandi, H., Moradkhani, A. Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2012; 5(1): 19-29.
Numerical and Experimental Evaluation of Residual Stress and Fatigue Strength of Steel CK35 in Shot Peening Process
1Professor, Science and Research Branch, Islamic Azad University, Arak, Iran
2Associate Professor, Malek Ashtar University of Technology, Tehran, Iran
3MSc Student, Islamic Azad University, Science and Research Branch, Tehran, Iran
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.
1استاد، دانشگاه آزاد اسلامی واحد علوم و تحقیقات مرکزی،گروه مکانیک، اراک، ایران
2دانشیار، دانشگاه صنعتی مالک اشتر، گروه مواد، تهران، ایران
3کارشناس ارشد، دانشگاه آزاد اسلامی واحد تهران شرق، دانشکده فنی و مهندسی ، گروه مهندسی مکانیک
Abstract [Persian]
ساچمه زنی نوعی بمباران سطحی قطعه کار توسط هزاران ساچمه است که به ایجاد تنش پسماند فشاری در سطح قطعه کار میانجامد و به منظور بهبود خواص مکانیکی همچون خستگی، مقاومت در برابر خوردگی تنشی، صاف کردن شکل دهی و... انجام میگیرد. در این پژوهش نمونههایی از فولاد CK35 مورد عملیات ساچمه زنی با سرعت برخورد m/s 100 و m/s200 ساچمههای استاندارد S230 قرار گرفتند و استحکام خستگی آنها با نمونههای فاقد ساچمه زنی مورد مقایسه قرار گرفت. همچنین تغییر عمق نفوذ ساچمهها در نمونهها توسط نرم افزار ANSYS محاسبه گردید و با نتایج تجربی مقایسه شد. نتایج حاصل، افزایش قابل توجه استحکام خستگی را دربرداشت. این مقادیر برای برخورد ساچمهها با سرعت m/s100، 25% افزایش در استحکام خستگی و بیش از MPa 250 تنش پسماند ایجاد شده در سطح کار و برای برخورد ساچمهها با سرعت m/s200، 40% افزایش در استحکام خستگی و بیش از MPa 300 تنش پسماند در سطح کار به‌دست آمد. همچنین میزان تنش ایجاد شده در ساچمهها دو برابر تنش پسماند القاء شده نسیت به سطح کار حاصل شد.
Keywords [Persian]
ساچمه زنی، تست خستگی، تنش پسماند، فولاد
References
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