EVALUATION OF SURFACE ROUGHNESS EFFECT ON FATIGUE LIFE IN DRILLING OF HARDENED STEEL

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RASTI AMIR; SADEGHI MOHAMMAD HOSSEIN; SABBAGHI FRASHI SINA

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Journal: Modares Mechanical Engineering Year:2018 | Volume:18 | Issue:1 Page(s): 103-110

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Title

EVALUATION OF SURFACE ROUGHNESS EFFECT ON FATIGUE LIFE IN DRILLING OF HARDENED STEEL

Author(s)

RASTI AMIR | SADEGHI MOHAMMAD HOSSEIN | SABBAGHI FRASHI SINA | Issue Writer Certificate

Keywords

DRILLINGQ1

FATIGUE LIFEQ2

SURFACE ROUGHNESSQ1

SURFACE TEXTUREQ2

Abstract

In this study, the effect of SURFACE ROUGHNESS on FATIGUE LIFE was investigated in DRILLING process of AISI4340 steel. Three hole making methods including DRILLING with and without pre-drill and helical milling were utilized. In order to study the effect of SURFACE ROUGHNESS and process parameters on fatigue strength, the two main cutting parameters including cutting speed (Vc) and feed rate (fz) were changed at 5 levels using the response surface method. Five main parameter of SURFACE ROUGHNESS profile including Rz, Rt, Ra, Rq, and Rsm were measured in each experiment. Then, the FATIGUE LIFE of specimens were obtained using fatigue tests. Regarding the validation experiments, 13 fatigue tests were carried out for each DRILLING strategy (39 fatigue tests totally). Investigation of SURFACE TEXTURE showed the signs of the tool path, scratches by the chip collisions and ploughing on whole surfaces in the conventional DRILLING. These effects were negligible in other processes. Accordingly, the highest roughness was observed in conventional DRILLING, DRILLING with pre-drill and helical milling processes respectively. Also, the FATIGUE LIFE estimation model based on Rz had the best estimation with an average error of 4.4%. In fact, the FATIGUE LIFE is more dependent on the difference between adjacent peaks and valleys. It was also observed that a model based on the roughness parameter will decrease the maximum prediction error of the FATIGUE LIFE from 16.4% to 7.5% compared to a model based on the cutting parameters.

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APA: Copy

RASTI, AMIR, SADEGHI, MOHAMMAD HOSSEIN, & SABBAGHI FRASHI, SINA. (2018). EVALUATION OF SURFACE ROUGHNESS EFFECT ON FATIGUE LIFE IN DRILLING OF HARDENED STEEL. MODARES MECHANICAL ENGINEERING, 18(1 ), 103-110. SID. https://sid.ir/paper/179425/en

Vancouver: Copy

RASTI AMIR, SADEGHI MOHAMMAD HOSSEIN, SABBAGHI FRASHI SINA. EVALUATION OF SURFACE ROUGHNESS EFFECT ON FATIGUE LIFE IN DRILLING OF HARDENED STEEL. MODARES MECHANICAL ENGINEERING[Internet]. 2018;18(1 ):103-110. Available from: https://sid.ir/paper/179425/en

IEEE: Copy

AMIR RASTI, MOHAMMAD HOSSEIN SADEGHI, and SINA SABBAGHI FRASHI, “EVALUATION OF SURFACE ROUGHNESS EFFECT ON FATIGUE LIFE IN DRILLING OF HARDENED STEEL,” MODARES MECHANICAL ENGINEERING, vol. 18, no. 1 , pp. 103–110, 2018, [Online]. Available: https://sid.ir/paper/179425/en

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