Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 478, Issue 2261, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rspa.2022.0054
Keywords
phase-change composites; micromechanics; effective moduli; energy equivalency framework
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11988102, 91848201, 12002004, 12102005]
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In this study, a micromechanical framework is developed to track the effective mechanical properties of phase-change composites throughout the phase transition, and its accuracy and reliability are verified. The proposed model can provide theoretical guidelines for the design of advanced devices with tunable mechanical performance.
Phase-change composites have a wide range of tunable mechanical properties caused by temperature-driven phase transition, and have been widely applied in many cutting-edge fields like soft robotics. Previous studies on the effective mechanical properties of phase-change composites mostly use experimental methods, and there have been few theoretical approaches. In this work, we develop a micromechanical framework capable of tracking the effective mechanical properties of phase-change composites throughout the entire phase transition. The phase-change materials embedded in the composites are modelled as inclusions, and the non-phase-change materials are modelled as the matrix. This allows us to determine the effective mechanical properties of phase-change composites via the energy equivalency approach. Moreover, since the new phase will be generated inside the phase-change inclusions in the form of sub-inclusions during the phase transition, the inclusions are modelled as two-phase composites, and their effective mechanical properties are then determined using the Mori-Tanaka method. Finally, by comparing theoretical predictions with experimental data, the accuracy and reliability of the present model are verified. We believe that the proposed model can serve as a powerful tool for evaluating the effective mechanical properties of phase-change composites and provide theoretical guidelines for the design of advanced devices with tunable mechanical performance.
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