BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI - Universitatea ...

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