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222 Dănuț Zahariea and Marius Stachie Passive layer Table 1 Material characteristics Active layer Titanium Zinc Aluminum Bronze Brass Copper Steel E 10 11 , [Pa] 1.14 0.97 0.7 1.1 1.31 1.1 2 α 10 -6 , [°C -1 ] 9.5 31.2 23.6 17.8 16.7 16.5 11.7 σ ,[MPa] 825 140 95 520 350 290 250 02 Fig. 1 – Geometric characteristics. In the paper two comparative analyses will be performed. First one is studying the influence of the beams width b = { 1, 5, 7. 5} mm for the same beams length L = 50 mm. The second one is studying the influence of the beams length L = { 50, 100 , 150} mm for the same beams width b = 5 mm. The beams thickness will be the same for all analyzed cases h = h = 1 mm. 2. The Structural Analysis Procedure The main steps of the procedure for structural analysis of the bimetallic strip using CATIA/Generative Structural Analysis environment are: 1. Creating the 3D model. Shall be carried out separately the two rectangular cross section beams using the Part workbench. The appropriate materials are assigned to each element. The assembly of the two beams is carried out using the Assembly workbench, Fig. 2a. 2. Configuring the mesh. Shall be carried out separately for each beam, by changing the characteristic parameters “Size” and “Sag”, Fig. 2b. 3. Applying the restraints. At one side of the bimetallic strip a clamp condition must be applied, Fig. 2c. 4. Applying the loads. On the both beams a thermal load with ΔT = 30 °C will be applied, Fig. 2d. 5. Applying the conditions for the interaction between the two beams of the bimetallic strip. First, the interaction condition of General Analysis Connection type will be applied between the active layer and the passive layer. Second, for the active area in terms of the stress/strain a p
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 223 transmission (the bounded surface) the stress/strain condition must be specified by setting the just property of interaction between the active and the passive layers (Fastened Connection), Fig. 2e 6. Launching the solver, running the numerical analysis and results visualization. The maximum deflection will be presented for the bimetallic strip in Fig. 2f (scale factor 100). The von Misses stress will be shown in Fig. 2g (scale factor 100) for active layer and in Fig. 2h (scale factor 100) for passive layer. a b c d e f g h Fig. 2 – Steps of structural analysis procedure: a – creating the 3D model; b – configuring the mesh; c – applying the restraints; d – applying the loads; e – applying the interaction conditions; f – maximum deflection; g – von Misses stress for the active layer; h – von Misses stress for the passive layer.
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BULETINUL INSTITUTULUI POLITEHNIC D
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Stachie Marius 221 Storm Kjærside
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