PSI - Issue 27

Angga Kengkongan Ary et al. / Procedia Structural Integrity 27 (2020) 69–76 Ary et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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maximum displacement, and maximum strain. Based on the overall data, carbon steel’s chassis concluded as the strongest among all proposed materials with consideration to safety factor values in the thinnest material. This tendency is also supported by occurred stress and strain, which indicates that the structure is capable of enduring higher stress levels, but the chassis experienced lower strain value. The global data in Fig. 2 discuss further in the next sub-section for each applied parameters precisely. Effects of different materials on the chassis indicated that with the same load applied on the frame with the value of 700 N and the same material thickness 1.4 mm, the highest maximum stress is 24.17 MPa (aluminum 6061), and the lowest value is 23.1 MPa (CFRP) as shown in Fig. 2 (b). In terms of maximum strain presented in Fig. 2 (d), the smallest is 0.000304 (CFRP), and the highest is 0.0005826 (aluminum 6061). Result data of the geometrical displacement shown in Fig. 2 (c), the lowest value is 0.516 mm (CFRP), and the highest is 1.001 mm (aluminum 6061). As shown in Fig. 2 (a), the minimum safety factor under the same condition (load 700 N and thickness 1.4 mm) obtains the highest value is 12.99 (CFRP), and the lowest is 11.38 (aluminum 6061). On the same load applied on the frame with the value of 150 N and the same material thickness 0.9 mm, the highest maximum stress is 8.818 MPa (aluminum 6061), and the lowest is 8.55 MPa (CFRP) as shown in Fig. 2 (b). In terms of the maximum strain presented in Fig. 2 (d), the smallest is 0.0001188 (CFRP), and the highest is 0.0002237 (aluminum 6061). Simulation result of maximum displacement shown in Fig. 2 (c), the lowest value is 0.069 mm (CFRP), and the highest is 0.134 mm (aluminum 6061). The minimum safety factor under the same condition obtains quite a similar value of 15 for CFRP and aluminum 6061, as shown in Fig. 2 (a).

b

a

c

d

Fig. 2. Simulation result: (a) Min. Safety factor; (b) Max. Stress; (c) Max. Displacement; and (d) Max. Strain.

4.1. Applied material Results in Fig. 3 indicate that based on the effect of material during load 700 N and thickness 1.4 mm used, the stress is around 8 MPa around the applied load location for the CFRP material, and it is about 7.5 MPa for the Al 6061 material. Both stresses are distributed all over the chassis and reach their minimum around the front and back structural constraints. Based on the von Mises stress concept used in this analysis, the stress value indicates the ability of the structure to hold the load given. In this case, both of the maximum stresses are still below their yield strength, so it concludes that these two materials will not fail in this case of simulation.