A Density-Dependent Modified Doraivelu Model for the Cold Compaction of Poly (Ether Ketone Ketone) Powders

• Published in: Polymers Vol. 14; no. 6; p. 1270
• Main Authors: Xu, Fan, Wang, Huixiong, Wu, Xuelian, Ye, Zihao, Liu, Hong
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 21.03.2022; MDPI
• Subjects: Accuracy; Algorithms; Cold; cold compaction; Composite materials; Computer simulation; Constitutive models; Density; Dimensional analysis; Experiments; Finite element method; Heat resistance; Hypotheses; Inverse method; Ketones; Mathematical models; Metal powders; modified Doraivelu model; Parameter identification; Parameter modification; PEKK powder; Physical properties; Polymers; Porous materials; Simulation; UMAT; modified Doraivelu model; cold compaction; UMAT; PEKK powder
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14061270

The cold compaction of poly (ether ketone ketone) (PEKK) powder was studied by experiments and simulations based on the modified Doraivelu model. Although this model can successfully predict the compaction behavior of metal powders, discussion of the prediction of polymer powders is lacking. Based on the mechanical theory of metal plasticity, the modified Doraivelu model was established by introducing the material parameters and . The modified model can predict the compaction density of PEKK powder during cold compaction. A sub-increment method for this constitutive model was then established and implemented into a finite-element model by using the user-defined material subroutine UMAT in ABAQUS/Standard. Consequently, the material parameters of the modified Doraivelu model were identified by an inverse method using the experimental data and simulation results. It was found that when = 0, = 4, and the initial relative density was 0.4485, the simulation results were the closest to the experimental ones.