Asian Congress of Structural and Multidisciplinary Optimization 2016 May 22–26, 2016, Nagasaki, Japan
Three Dimensional Shape Identification of Cavity in Structures Based on Thermal Testing Data
Takahiko Kurahashi1, Kotaro Maruoka2 and Tetsuro Iyama
1 Nagaoka University of Technology, Nagaoka, Niigata, Japan, [email protected]
2 Nagaoka University of Technology, Nagaoka, Niigata, Japan, [email protected]
3 National Institute of Technology, Nagaoka College, Nagaoka, Niigata, Japan, [email protected]
In this study, we present three dimensional shape identification of cavity in structure based on the finite element and adjoint variable methods using the temperature history on specimen surface. It is known that if there is a cavity in the target structure, existence of cavity can be confirmed by the thermal testing method (See Figures 1, 2 and 3). However, size or shape of the cavity can’t be numerically evaluated based on the heat image on surface of target structure. Therefore, in this study, we measured time history of temperature on test piece, i.e., resin structure with cavity made by 3D printer, and carried out the shape identification of cavity based on the adjoint variable and finite element methods. The finite element mesh of the test piece is shown in Figure 4. The results of some numerical experiment will be presented.
Test pieces
Hot plate
Thermocouple With cavity Without cavity
(15-mm thickness)
Figure 1. Experimental apparatus. Figure 2. Time history of temperature
on test piece at center point of upper surface.
Figure 3. Heat image on surface of test piece Figure 4. Finite element mesh
