PSI - Issue 52

Chenxu Jiang et al. / Procedia Structural Integrity 52 (2024) 63–71 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 5 (a) Multi-spherulites calculate model (b) Voronoi spherulite morphology (c) Sheaf structure and the initial orientation of the principal axis

Fig. 6 The distribution of initial orientation and probability density

4. Result and discussions The anisotropic deformation behaviors of spherulites due to sheaf structure are evident in Fig. 7. The equivalent elastic modulus of the material varies with the initial o rientation of the principal axis. When θ changes from 0° to 60°, the effective elastic modulus gradually decreases. However, when θ increases from 60° to 90°, the effective elastic modulus slightly increases.

Fig. 7 The change in equivalent elastic modulus of spherulite with a different initial orientation

To further investigate the effect of initial orientations on multi-spherulite deformation, the authors considered four representative orientations (-42°, 0°, 45°, and 90°), as shown in Fig. 8a. Moreover, to analyze the stress and strain distributions along the radius, the authors set the A-A' and B-B' paths, illustrated in Fig. 8b. According to Fig. 9, the distribution of stress and strain within the internal spherulite is highly uneven, with stress and strain starting from the center of the spherulite and gradually decreasing along the radius. Stress is mainly controlled by the slip behavior of the crystal lamellae and mainly located within them, while strain is mainly located in the amorphous lamellae. Notably, significant differences are observed in stress and strain distributions when the