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All Journal Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse) PROCEEDING OF INTERNATIONAL CONFERENCE ON BUSINESS MANAGEMENT AND ACCOUNTING Luxury: Landscape of Business Administration Proksima Prosiding SNTTM
Dalil, M
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Chemical Engineering, Chemistry & Bioengineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Journal : prosiding snttm

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The effect of thread depth on the fatigue strength of AISI 4140 bolt material as a retainer and fastener for a screw conveyor Dalil, M
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/x44rv532

Abstract

The bolts used to retainer and fasten the shaft of the screw conveyor, which functions to transport wood chips to the cooking process in paper manufacturing, have experienced failure. The failure occurred in the form of a perpendicular fracture on the threaded section of the bolt. This damage significantly disrupts wood processing operations, making it important to investigate the causes. The causes of bolt fracture and its short service life were analyzed by studying the effect of thread pitch variations of 2.5 mm and 2 mm. The materials tested were Valmet (VME) and Valmet (VMC), which are equivalent to AISI 4140. The fatigue test was conducted using a cantilever rotating bending method with the test specimens according to ASTM E466M standards. The results showed that to achieve infinite life, the stress level must be below 95 MPa. Thread pitch has a significant effect: VME bolts with a thread pitch of 2 mm showed a 17% longer endurance than bolts pitch of 2.5 mm, while VMC bolts with a thread pitch of 2 mm had a 15% longer endurance than bolts pitch of 2.5 mm. Furthermore, VME bolts showed 11% higher fatigue endurance than VMC bolts. The endurance of VMC bolts decreases due to the presence of more cracks and voids in the VMC material. This defect is related to the lower chromium (Cr) content in VMC.  cracks and voids is exacerbated by the heat treatment, which reduces the effectiveness of alloying elements in delaying crack formation on the surface.
Co-Authors Abdul Khair Junaidi Achmad Tavip Junaedi Amries Rusli Tanjung Cecilia, Cecilia Dinova, Alfito Dodi Sofyan Arief, Dodi Sofyan Fifi Puspita Gusrio Tendra Harris Aminuddin Harry Patuan Panjaitan Imnadir, Imnadir Jahrizal Koto, Jaswar Marlim, Yulvia Nora Muftil Badri Musa, Sulaiman Nicholas Renaldo Nyoto Nyoto, Nyoto Nyoto, Rebecca La Volla Rahman, Sarli Sari, Azzaharah Isyari Nuraini Suhardjo Sukemi Indra Saputra Tarigan, Dito Arief Maulana Umar Faruq Veronica, Kristy Wahid, Nabila Wilda Susanti