where Δ𝑯𝒎 is the heat of fusion of each sample (J/g) and Δ𝑯𝒎’ is the
heat of melting for 100% crystalline polystyrene, equal to 86 J/g
[18].
The PS failure surface analysis was performed by observing the fracture
cross-section after the test. This surface was examined using SEM
(Quanta FEG250, FEI). The samples were previously coated with platinum
in a vacuum chamber.
Results and Discussion
The investigation of the mechanical fatigue behavior of PS was carried
out by maintaining the stress amplitude between 7.5–13 Mpa, at room
temperature until material failure occurred, as observed in Figure 1.A.
Figure 1.B shows the deformation response of the applied load.