A thermoviscoelastic finite deformation constitutive model based on dual relaxation mechanisms for amorphous shape memory polymers

Autor:	Hao Duan, Jianping Gu, Hao Zeng, Akbar A. Khatibi, Huiyu Sun
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	Shape memory polymers constitutive model dual relaxation mechanisms viscous flow rules internal stress model Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	International Journal of Smart and Nano Materials, Vol 14, Iss 2, Pp 243-264 (2023)
Druh dokumentu:	article
ISSN:	19475411 1947-542X 1947-5411
DOI:	10.1080/19475411.2023.2206675
Popis:	ABSTRACTThis paper proposes a new thermoviscoelastic finite deformation model incorporating dual relaxation mechanisms to predict the complete thermo-mechanical response of amorphous shape memory polymers. The model is underpinned by the detailed microscopic molecular mechanism and effectively reflects the current understanding of the glass transition phenomenon. Novel evolution rules are obtained from the model to characterize the viscous flow, and a new theory named an internal stress model is introduced and combined with the dual relaxation mechanisms to capture the stress recovery. The rationality of the constitutive model is verified as the theoretical results agree well with the experimental data. Moreover, the constitutive model is further simplified to facilitate engineering applications, and it can roughly capture the characteristics of shape memory polymers.
Databáze:	Directory of Open Access Journals
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