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Damage-induced mechanical damping in phase-transforming composites materials

Junker, Philipp and Kochmann, Dennis M. (2017) Damage-induced mechanical damping in phase-transforming composites materials. International Journal of Solids and Structures, 113-114 . pp. 132-146. ISSN 0020-7683. https://resolver.caltech.edu/CaltechAUTHORS:20170518-075917401

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Abstract

We investigate the influence of stress-induced damage on the effective viscoelastic response of two-phase composites having constituents that undergo solid-solid phase transitions. Such composites are prone to experience damage near the interfaces separating phase-transforming inclusions and the non-transforming matrix. By accounting for inelasticity, temperature-induced phase transitions, and damage in the individual constituents and applying techniques of computational homogenization, we numerically show that the observed damage and resulting decrease in matrix stiffness can lead to significant changes in the overall, frequency-dependent damping and dynamic stiffness of the composite under time-harmonic two-dimensional loading. This is of particular interest since recent experiments and simulations hinted at increased composite damping due to metastable states of phase-transforming inclusions when embedded in a stiff matrix (so-called negative stiffness). Experiments also reported signs of matrix degradation, the causal mechanisms and consequences of which have not been investigated. The homogenized material response reported here reveals the interplay of material viscosity, matrix degradation, and structural transition, and illustrates how phase transformation and localized damage may lead to pronounced effective damping and stiffness variations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.ijsolstr.2017.01.040DOIArticle
http://www.sciencedirect.com/science/article/pii/S0020768317300501PublisherArticle
ORCID:
AuthorORCID
Junker, Philipp0000-0002-8572-6841
Kochmann, Dennis M.0000-0002-9112-6615
Additional Information:© 2017 Elsevier Ltd. Received 26 November 2016. Revised 11 January 2017. Accepted 24 January 2017. Available online 25 January 2017.
Subject Keywords:Viscoelasticity; Phase transformation; Damage; Composite; Homogenization
Record Number:CaltechAUTHORS:20170518-075917401
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170518-075917401
Official Citation:Philipp Junker, Dennis M. Kochmann, Damage-induced mechanical damping in phase-transforming composites materials, International Journal of Solids and Structures, Volumes 113–114, 15 May 2017, Pages 132-146, ISSN 0020-7683, https://doi.org/10.1016/j.ijsolstr.2017.01.040. (http://www.sciencedirect.com/science/article/pii/S0020768317300501)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77549
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:18 May 2017 16:21
Last Modified:03 Oct 2019 17:59

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