Spherical Indentation of Superelastic Shape Memory Alloys


Article Preview

Spherical indentation of superelastic shape memory alloys (SMAs) has been theoretically analyzed. Two characteristic points on the superelastic indentation curve have been discovered. The bifurcation force corresponding to the bifurcation point relies on the forward transformation stress and the return force corresponding to the return point relies on the reverse transformation stress. Based on these theoretical relationships, an approach to determine the transformation stresses of superelastic SMAs has been proposed. To improve the accuracy of the measurement, a slope method to locate the two characteristic points from the slope curves is further suggested. Additionally, the spherical indentation hardness was also analyzed.



Key Engineering Materials (Volumes 334-335)

Edited by:

J.K. Kim, D.Z. Wo, L.M. Zhou, H.T. Huang, K.T. Lau and M. Wang




W. Y. Yan and Q. P. Sun, "Spherical Indentation of Superelastic Shape Memory Alloys", Key Engineering Materials, Vols. 334-335, pp. 601-604, 2007

Online since:

March 2007




[1] Y.Y. Fu, H. Du., W. Huang, S. Zhang and M. Hu: Sensors and Actuators A 112 (2004), p.395.

[2] L. Qian, X. Xiao, Q. Sun and T. Yu: Appl. Phys. Lett. 84 (2004), p.1076.

[3] R. H. Richman, A. S. Rao and D. Kung: Wear 181-183 (1995), p.80.

[4] W. Yan: Mater. Sci. Eng. A (2006), in press.

[5] D. Y. Li: Smart Materials and Structures 9 (2000), p.717.

[6] W. Yan, Q. Sun, X. -Q. Feng and L. Qian: Int. J. Solids Struct (2006), in press.

[7] W. Yan, Q. Sun, X. -Q. Feng and L. Qian: Appl. Phys. Lett. 88 (2006), p.241912.

[8] W. Yan, Q. Sun and H. -Y. Liu: Mater. Sci. Eng. A 425 (2006), p.278. Fig. 6. Relationship between the ratio fH σ/ and hm/R Fig. 5. Influence of /mh R on the normalized hardness / aH E.

Fetching data from Crossref.
This may take some time to load.