PSI - Issue 33

Ilham Widiyanto et al. / Procedia Structural Integrity 33 (2021) 27–34 Widiyanto et al. / Structural Integrity Procedia 00 (2019) 000–000

33 7

Table 6. Summary of the reaction force on three directions, including resultant values. Type Minimum

Maximum 548.9 N

Resultant

0 N

X axis Y axis Z axis

-141.2 N -150.4 N -328.4 N

255 N 423.8 N 345.8 N

a

b

c

Fig. 7. Contours of reaction force on different axis. (a) X axis, (b) Y axis, (c) Z axis

4.5. Safety factor The chassis components are subject to fluctuating loads arising from road vibrations and the movements of loads. Fatigue-cracking chassis and sub-frames are relatively standard. Safety factor or Safety Figs are a critical parameter for determining whether a construction is safe or not. Safety Factor is a comparison between the permit strain of the material and the stress that occurs. The need to consider all potential modes of failure, including the unexpected, is emphasized, and an outline is given of safety factor treatments for crack tip-dependent and time-dependent modes (Burdekin,2007). Construction is declared safe if the safety number is above one. The result simulation can be seen in Fig. 8 which the minimum value is obtained 1.14, and the maximum value is 15.

Fig. 8. Results of the safety factors.