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Postbuckling characteristics of the short superelastic shape memory alloy columns- experiment and quantitative analysis

Rahman M. A., Tani J.

International Journal of Applied Mechanics and Engineering

2006

Vol. 11, no 4

941-955

A few unique buckling and postbuckling characteristics of short superelastic shape memory alloy (SMA) columns are observed experimentally and explained in terms of numerical simulation. Interestingly, it is found from the load-deformation curves that during compression the SMA column with slenderness ratio of 38 exhibits two distinct buckling loads, the other one being higher, completely contrary to the general notion that load falls off monotonously for all columns in the postbuckling region. Similarly, for of 28, the SMA column can sustain a significantly high load after a distinct change in the mode of deformation. Based on the large deformation theory as well as the nonlinear stress-strain relations, the load-deformation curves of the short SMA columns have been predicted by using the FEM code ANSYS. Precise and quantitative analyses of these results verify the fact that the SMA column's behavior can be attributed to the special nature of the stress-strain curves.

Przegląd metod wysokowydajnego spawania GMAW

Tani J.

Przegląd Spawalnictwa

2004

R. 76, nr 5-7

82-84

A finite element technique for eddy current testing simulation

Fukutomi H., Takagi T., Tani J.

Journal of Technical Physics

1998

Vol. 39, no 3-4

459-464

This paper briefly presents results concerning signal prediction of simulated eddy current testing for in-service inspection of the steam generators of pressurized water type reactor in nuclear plants. After general remarks on the application of finite elements to this problem, a finite element technique developed for this testing is described. Finally, simulated signals from cracks of different profiles are compared with experimental measurements.