Damage-induced mechanical damping in phase-transforming composites materials

verfasst von: Philipp Junker, Dennis Michael Kochmann
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.
Externe Organisation(en): Ruhr-Universität Bochum
Typ: Artikel
Journal: International Journal of Solids and Structures
Band: 113-114
Seiten: 132-146
Anzahl der Seiten: 15
ISSN: 0020-7683
Publikationsdatum: 15.05.2017
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Modellierung und Simulation, Werkstoffwissenschaften (insg.), Physik der kondensierten Materie, Werkstoffmechanik, Maschinenbau, Angewandte Mathematik
Elektronische Version(en): https://doi.org/10.1016/j.ijsolstr.2017.01.040 (Zugang: Offen)
: Details im Forschungsportal „Research@Leibniz University“

BibTeX

@article{a8f296484d704aef89eb51590f55017c,
title = "Damage-induced mechanical damping in phase-transforming composites materials",
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.",
keywords = "Composite, Damage, Homogenization, Phase transformation, Viscoelasticity",
author = "Philipp Junker and Kochmann, {Dennis Michael}",
note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",
year = "2017",
month = may,
day = "15",
doi = "10.1016/j.ijsolstr.2017.01.040",
language = "English",
volume = "113-114",
pages = "132--146",
journal = "International Journal of Solids and Structures",
issn = "0020-7683",
publisher = "Elsevier Ltd.",
}