 # Table 51 comparison of four models discussed above

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Table 5.1: Comparison of four models discussed above. Simulation Models Solid Loss (Watts) [0 0] 1.08e-5 [0 90] 1.92e-5 [ 0 0 0 0] 2.02e-5 [0 90 0 90] 2.11e-5 As shown in Table 5.1 the solid loss obtained for four layers of simulation model with 0’s and 90’s fiber orientation is higher compared to other three models. Moreover, the results suggest that if there are more number of fibers, the output results will also increase. 5.3.2.1 Four Layers Simulation Model with More Number of Fibers. In these simulation models, there are more numbers of carbon fibers for both the models with four layers shown in the previous section. The number of carbon fibers is doubled.
64 (a) (b) Figure 5.7: Four layers models with more fibers (a) same orientation, (b) 0 and 90 orientation. Fig 5.7 represents the simulation models with more number of carbon fibers. One model has all the carbon fibers in the same direction whereas another model has 0 and 90 orientation. The solid loss obtained for all the fibers in the same orientation and 0 and 90 orientation are 51072.3-×and 51094.3-×W,respectively. These results are comparatively higher compared to that of the previous section. This explains that more carbon fiber gives
65 higher solid loss. Moreover, the results explain that the results for 0 and 90 orientation is higher compared to the fiber orientated in the same direction. 5.4 Hypothesis of Interface Heating Results obtained for different simulation models until now suggest that heating in a laminate takes place in a very thin area where two plies with different fiber direction meet. Hence, to verify this hypothesis a series of models with two plies were created and simulated. One ply with 0 degrees and the other with 90 degrees fibers orientation. Also, using a fixed coil distance to the welding plane. Adding layers of individual fibers to the two plies as follows: 1.[- - 90] and [ 0 - - ] 2.[- 90 90] and [ 0 0 -] 3.[90 90 90] and [0 0 0] and so on. Looking at the ply with a microscope, it was found that there are around 30 layers of individual fibers in one ply. Therefore, the last simulation model will be [30(90)] and [30(0)]. If heat generation is less in the plies with respect to the numbers of fibers, it can be concluded that heating is limited to the fibers close to the interface. If this hypothesis is correct, simulation modeling will be easy because it will be then limited to only a few layers of carbon fibers. Figure 5.8 represents the first simulation model for the hypothesis. In this model, there are two layers of fibers, 0 and 90 orientation. The fibers are created using cylinders. The diameter and length of the carbon fibers are 0.07 mm and 5 mm respectively, and the distance between two fibers in the same layer is 0.07 mm. In addition, the distance between
66 the two layers is 0.07 mm. There is a conductive coil on top of the fibers at 6 mm distance from the plane. The coil has a rectangular cross-section of 1.5 mm x 0.75 mm.

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Term
Fall
Professor
jahnsmit
Tags
Monel
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