Fatigue Behavior of Medium Carbon Steel by Symmetric Bending Ultrasonic Frequency Method

Abstract:

The S-N curves of medium carbon steel(MCS) are determined by the ultrasonic symmetric bending fatigue system (20 KHz). The results show that two S-N curves of MCS display the characteristic of “continually decreasing type” up to 109 cycles and exhibit no traditional horizontal plateau beyond 106 cycles. When the fatigue cycles are over 109, fatigue failure do occurs. By comparison of the two curves of 2mm thick and 5mm thick MCS, the results show that in the high-cycle stage(107cycles), size effect has no significant impact on fatigue Properties. This can also be explained by the theory of crack initiation, in high cycle stage, fatigue crack initiation exists in the sample surface, and in ultra-high-cycle stage, fatigue crack initiation exists in internal initiation.

• Periodical: Advanced Materials Research (Volumes 393-395)
• Pages: 102-105
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.393-395.102
• Online since: November 2011
• Authors: Wei Wei Tang, Hong Wang, Jin Gan Dai
• Keywords: Medium Carbon Steel, Size Effect Coefficient, Stress Gradient, Symmetric Bending Loading, Ultrasonic Fatigue

References

[1] Mason W P: Piezoelectric crystals and their application in ultrasonic. Van Nostrand, New York, 161(1950).

[2] Suresh S: Fatigue of Materials (Defense Industry Press, Beijing1999), in Chinese.

[3] Guiling Yan, Hong Wang and Qing Gao: Transactions of Materials And Heattreatment Vol. 28(2007), p.81–84, in Chinese.

[4] Hong Wang: Southwest Jiaotong University, Chengdu(2004), p.75–77, in Chinese.

[5] Hong Wang and Qing Gao: Physical Testing and Chemical Analysis Part A Physical Testing Vol. 41(2005), p.433–435, in Chinese.

[6] Renzhi Wang, Mei Yao, Peige Shao: China Surface Engineerign No. 01(1998), p.27–31, in Chinese.