Strength Modeling For Degradation Of Bioresorbable Polyesters Based On Phase Image Pattern Recognition

Biomedical degradable polymer materials are widely used in medicine because of their excellent mechanical properties and degradation properties. The matching of strength change and degradation rate in the degradation process is a crucial consideration in the design of polymer devices. Establishing a strength model of the polymer degradation process can quantify the intensity evolution during the degradation process. In this research, the structural changes in the process of polymer erosion degradation are taken as the primary consideration, and the evolution of the phases of strength are reflected by the changes of structure. The concept of strength phase images is proposed. The images of the strength phase diagram are identified by the image processing method. The Near Neighbor-Boundary Enlargement Algorithm (NNBE) is put forward to identify features with the hole(block) and crack(-strip) shape patterns. The strength model for different phase patterns is established. The model calculation is compared with the experimental data, and the model simulation value and the experimental value are well fitted, which indicates that the strength model and phase diagram feature extraction algorithm are feasible. (C) 2020 Elsevier Ltd. All rights reserved.