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Modeling of Creep Behavior of Particulate Composites with Focus on Interfacial Adhesion Effect

  • Evaluation of creep compliance of particulate composites using empirical models always provides parameters depending on initial stress and material composition. The effort spent to connect model parameters with physical properties has not resulted in success yet. Further, during the creep, delamination between matrix and filler may occur depending on time and initial stress, reducing an interface adhesion and load transfer to filler particles. In this paper, the creep compliance curves of glass beads reinforced poly(butylene terephthalate) composites were fitted with Burgers and Findley models providing different sets of time-dependent model parameters for each initial stress. Despite the finding that the Findley model performs well in a primary creep, the Burgers model is more suitable if secondary creep comes into play; they allow only for a qualitative prediction of creep behavior because the interface adhesion and its time dependency is an implicit, hidden parameter. As Young’s modulus is a parameter of these models (and the majority of other creep models), it was selected to be introduced as a filler content-dependent parameter with the help of the cube in cube elementary volume approach of Paul. The analysis led to the time-dependent creep compliance that depends only on the time-dependent creep of the matrix and the normalized particle distance (or the filler volume content), and it allowed accounting for the adhesion effect. Comparison with the experimental data confirmed that the elementary volume-based creep compliance function can be used to predict the realistic creep behavior of particulate composites.

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Document Type:Article
Author:Julian Rech, Esther Ramakers-van Dorp, Bernhard Möginger, Berenika Hausnerova
Parent Title (English):International Journal of Molecular Sciences
Article Number:14120
Number of pages:13
Publishing Institution:Hochschule Bonn-Rhein-Sieg
Date of first publication:2022/11/15
Copyright:© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.
Funding:The author B.H. acknowledges the financial support of the Ministry of Education, Youth and Sports of the Czech Republic-DKRVO (RP/CPS/2022/003).
Keyword:adhesion factor; creep; creep compliance; cube in cube model; elementary volume; modeling; particulate composite
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Institut für Technik, Ressourcenschonung und Energieeffizienz (TREE)
Dewey Decimal Classification (DDC):6 Technik, Medizin, angewandte Wissenschaften / 66 Chemische Verfahrenstechnik / 660 Chemische Verfahrenstechnik
Entry in this database:2022/11/24
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International