Description of Work-Hardening Layer’s Depth by Soft Coefficient

Abstract:

In this paper, by introducing the conceptions of stress condition and soft coefficient, a nonlinear equation is used to describe stress condition of the contacting body along depth. By taking the classical contact problem of two parallel cylinders as an example, we give a quantitative description of work-hardening layer’s depth related to local contact problems by using soft coefficient, and it is theoretically proved that plastic deformation and plastic failure exist objectively in engineering contact problem. The analysis indicates that hardening layer’s depth in the range of 0.43643b(where “b” represents contacting semi-width ), where soft coefficient equivalents to infinity, can be defined as "work-hardening surface layer", depth ranging from 0.43643b to 3b can be roughly defined as "subsurface layer", and depth ranging out of 3b can be defined as "deep layer". Finite element analysis of Ono-rolling specimen shows that measuring method of x-ray of the residual stress is relatively more accurate in the surface layer; however, numerical method can give more accurate results than experimental method in the subsurface and deep layer.

• Periodical: Key Engineering Materials (Volumes 419-420)
• Pages: 73-76
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.419-420.73
• Online since: October 2009
• Authors: Rong Chang Liu, Li Dong Chen, Yu Wu, Shu Ying Ma, Li Zhen Feng
• Keywords: Hardening Layer, Soft Coefficient, Stress Condition, Work-Hardening

References

[1] Z.Z. Wu: Application Manual of Mechanical Design (Chemical Industry Press, Beijing, 2003).

[2] X.B. Liu, G. Yu, J. Guo, and et al, in: Analysis of Laser Surface Hardened Layers of Automobile Engine Cylinder Line, edited by L.T. Dong, Vol. 14(2007) of Journal of Iron and Steel Research International, chapter, 1, pp.132-136.

DOI: 10.1016/s1006-706x(07)60010-7

[3] M. Koitsures, O. Satoshiidual, M. Hidefumi, and et al, Stresses and Hardened Layers of Gears Due to Dual Frequency Induction Hardening, Vol. 2(2002) of Machine Design and Tribology Division Meeting in JSME, pp.21-26.

DOI: 10.1299/jsmemdt.2002.2.21

[4] J.H. Wang: Materials Mechanical Properties (Tianjin University Press, Tianjin, 2007).

[5] B.Y. Xu: Elastic Mechanics (Tsinghua University Press, Beijing, 2007).

[6] D.L. Shu: Mechanical Properties of Engineering Materials (Mechanical Industry Press, Beijing, 2003).

[7] Y. Shimamoto, H. Yamaguchi, in: Improvement of Fatigue Strength on Crankshaft by Fillet Rolling, edited by L. Maners, Vol. 44(1990), pp.65-77.

[8] R.C. Liu, L.Q. Xue, H.Z. Liu, and et al, in: Research on the Loading Range and Principle in Crankshaft Chamfer Rolling, edited by S.Y. Chu, Vol. 36(2005) of Transactions of The Chinese Society of Agricultural Machinery, chapter, 2, pp.119-122.