TY - JOUR
T1 - Identification of RVE length scale in fiber composites via combined optical and SEM digital image correlation
AU - Koohbor, Behrad
AU - Montgomery, Christopher B.
AU - Sottos, Nancy R.
N1 - This work has been supported through a grant No. FA9550-12-1-0445 to the Center of Excellence on Integrated Materials Modeling (CEIMM) at Johns Hopkins University , awarded by the AFOSR /Aerospace Materials for Extreme Environments Program and AFRL/RX. The authors wish to acknowledge the Imaging Technology Group at the Beckman Institute for use of microscopy equipment. The authors also gratefully acknowledge Dr. Michael Rossol, Prof. Scott White and Prof. Phillippe Geubelle for their helpful insight and discussions.
This work has been supported through a grant No. FA9550-12-1-0445 to the Center of Excellence on Integrated Materials Modeling (CEIMM) at Johns Hopkins University, awarded by the AFOSR/Aerospace Materials for Extreme Environments Program and AFRL/RX. The authors wish to acknowledge the Imaging Technology Group at the Beckman Institute for use of microscopy equipment. The authors also gratefully acknowledge Dr. Michael Rossol, Prof. Scott White and Prof. Phillippe Geubelle for their helpful insight and discussions.
PY - 2022/8/18
Y1 - 2022/8/18
N2 - The representative volume element (RVE) in fiber composites refers to the smallest volume of material that contains all constituents of the composite, i.e., fiber and matrix, and is a domain in which the homogenization of microscale response will lead to the macroscale behavior. Therefore, the RVE size in fiber composites is the length scale at which micro to macroscale transition occurs. In this work, a multiscale experimental approach is developed to experimentally characterize the length scale of RVE in a carbon fiber composite with a random fiber distribution. The approach is based on combining optical and scanning electron microscope (SEM) digital image correlation (DIC) measurements. A statistical procedure based on spatial averaging of local strain data is applied to the strain fields obtained from optical and SEM DIC measurements. The convergence between local strains averaged over a carefully selected domain and global strains is used as the criterion for identifying the RVE size in the examined composite. The RVE sizes determined using this approach are stress dependent and increase with the evolution of internal damage in the composite.
AB - The representative volume element (RVE) in fiber composites refers to the smallest volume of material that contains all constituents of the composite, i.e., fiber and matrix, and is a domain in which the homogenization of microscale response will lead to the macroscale behavior. Therefore, the RVE size in fiber composites is the length scale at which micro to macroscale transition occurs. In this work, a multiscale experimental approach is developed to experimentally characterize the length scale of RVE in a carbon fiber composite with a random fiber distribution. The approach is based on combining optical and scanning electron microscope (SEM) digital image correlation (DIC) measurements. A statistical procedure based on spatial averaging of local strain data is applied to the strain fields obtained from optical and SEM DIC measurements. The convergence between local strains averaged over a carefully selected domain and global strains is used as the criterion for identifying the RVE size in the examined composite. The RVE sizes determined using this approach are stress dependent and increase with the evolution of internal damage in the composite.
KW - A. Carbon fibers
KW - B. Mechanical properties
KW - C. Transverse cracking
KW - D. Scanning electron microscopy (SEM)
KW - Digital image correlation
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U2 - 10.1016/j.compscitech.2022.109613
DO - 10.1016/j.compscitech.2022.109613
M3 - Article
AN - SCOPUS:85133203625
SN - 0266-3538
VL - 227
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 109613
ER -