THE SIZE EFFECT ON FATIGUE STRENGTH OF STRUCTURAL STEEL MATERIALS IN HIGH-HUMIDITY ENVIRONMENT

Authors

  • Haftirman Haftirman School of Mechatronic Engineering, Mechanical Engineering Program, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia.

Keywords:

Fatigue strength, structural steel, high-humidity environment, crack length, fatigue test.

Abstract

Fatigue tests under rotating bending fatigue testing machine has been carried out to estimate the size effect on fatigue strength of structural steel materials in high-humidity environment. The size and geometry of the specimens were in accordance with specifications of ASTM E-466. The specimen contains a shallow notch to observe crack initiation. The specimen surface and shallow notch were ground with grade 1200 emery paper and then were buff finished. The tests were carried out a variation of diameter size specimens from 8 mm, 2 mm, and 1 mm in humidity environment with 60 % relative humidity, 70 % relative humidity, 80 % relative humidity and 90 % relative humidity. The results show that the fatigue strength increases with decreasing specimen size from diameter of 2 mm and 1 mm of SS400 and S45C steels in high-humidity environment. Ion-exchanged water remarkably reduces the fatigue strength of these steels. The initiation and propagation behaviors of micro cracks were investigated on the specimen surface. Cracks were observed by a scanning electron microscope (SEM).

References

Haftirman, S. Hattori, and T. Okada, “Fatigue Strength of Structural Steel in High-Humidity Environment,†Trans. of the Japan Society of Mechanical Engineers. Japan, vol. A 61-586, pp. 1179-1184, June 1995.

Haftirman, S. Hattori, and T. Okada, “Fatigue Strength of Aluminum Alloys in High-Humidity Environment,†Trans. of the Japan Society of Mechanical Engineers. Japan, vol. A 62-597, pp. 24-29, May 1996.

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Published

2018-04-03

How to Cite

Haftirman, H. (2018). THE SIZE EFFECT ON FATIGUE STRENGTH OF STRUCTURAL STEEL MATERIALS IN HIGH-HUMIDITY ENVIRONMENT. Jurnal Mekanikal, 32(1). Retrieved from https://jurnalmekanikal.utm.my/index.php/jurnalmekanikal/article/view/90

Issue

Section

Mechanical

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