TY - JOUR
T1 - Computational homogenization of the debonding of particle reinforced composites
T2 - The role of interphases in interfaces
AU - Spring, Daniel W.
AU - Paulino, Glaucio H.
N1 - Funding Information:
We acknowledge support from the Natural Sciences and Engineering Research Council of Canada and from the U.S. National Science Foundation through Grants #1321661 and #1437535 . We also acknowledge support from the Raymond Allen Jones Chair at the Georgia Institute of Technology. The information presented in this publication is the sole opinion of the authors and does not necessarily reflect the views of the sponsors or sponsoring agencies.
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/7/27
Y1 - 2015/7/27
N2 - Abstract There are four primary factors which influence the macroscopic constitutive response of particle reinforced composites: component properties, component concentrations, interphases, and interfacial debonding. Interphases are often a byproduct of surface treatments applied to the particles to control agglomeration. Alternatively, in polymer based materials such as carbon-black reinforced rubber, an interphase or "bound rubber" phase often occurs at the particle-matrix interface. This interphasial region has been known to exist for many decades, but is often omitted in computational investigations of such composites. In this paper, we present an investigation into the influence of interphases on the large deformation response of particle reinforced composites. In addition, since particles tend to debond from the matrix at large deformations, we investigate the influence of interfacial debonding on the macroscopic constitutive response. The investigation considers two different microstructures; both a simplified single particle model, and a more complex polydisperse representative unit cell. Cohesive elements, which follow the Park-Paulino-Roesler traction-separation relation, are inserted between each particle and its corresponding interphase to account for debonding. To account for friction, we present a new, coupled cohesive-friction model and detail its formulation and implementation. For each microstructure, we discuss the influence of the interphase thickness and stiffness on the global constitutive response in both uniaxial tension and simple shear. To validate the computational framework, comparisons are made with experimental results available in the literature.
AB - Abstract There are four primary factors which influence the macroscopic constitutive response of particle reinforced composites: component properties, component concentrations, interphases, and interfacial debonding. Interphases are often a byproduct of surface treatments applied to the particles to control agglomeration. Alternatively, in polymer based materials such as carbon-black reinforced rubber, an interphase or "bound rubber" phase often occurs at the particle-matrix interface. This interphasial region has been known to exist for many decades, but is often omitted in computational investigations of such composites. In this paper, we present an investigation into the influence of interphases on the large deformation response of particle reinforced composites. In addition, since particles tend to debond from the matrix at large deformations, we investigate the influence of interfacial debonding on the macroscopic constitutive response. The investigation considers two different microstructures; both a simplified single particle model, and a more complex polydisperse representative unit cell. Cohesive elements, which follow the Park-Paulino-Roesler traction-separation relation, are inserted between each particle and its corresponding interphase to account for debonding. To account for friction, we present a new, coupled cohesive-friction model and detail its formulation and implementation. For each microstructure, we discuss the influence of the interphase thickness and stiffness on the global constitutive response in both uniaxial tension and simple shear. To validate the computational framework, comparisons are made with experimental results available in the literature.
KW - Coupled cohesive-friction relation
KW - Interfacial debonding
KW - Interphases
KW - Representative unit cells
UR - http://www.scopus.com/inward/record.url?scp=84937865046&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84937865046&partnerID=8YFLogxK
U2 - 10.1016/j.commatsci.2015.07.012
DO - 10.1016/j.commatsci.2015.07.012
M3 - Article
AN - SCOPUS:84937865046
SN - 0927-0256
VL - 109
SP - 209
EP - 224
JO - Computational Materials Science
JF - Computational Materials Science
M1 - 6613
ER -