Journal
COMPOSITES PART B-ENGINEERING
Volume 77, Issue -, Pages 238-247Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.03.043
Keywords
Smart materials; Carbon fiber; Debonding; Finite element analysis (FEA)
Funding
- National Science Foundation [1100954, 1126540]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1100954] Funding Source: National Science Foundation
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In this research pull-out specimens were tested to investigate the bond behavior of superelastic NiTi (Nitinol) SMA wires to carbon fiber reinforced polymers (CFRP). A total of 45 pull-out specimens were tested monotonically up to failure. The test parameters considered include the wire diameter and embedment length. A digital image correlation (DIC) system was used to identify the onset and propagation of debonding. Based on the experimental observations two debonding mechanisms were observed: complete debonding after the onset of martensitic transformation of SMA wire, and complete debonding before the onset of wire transformation. The former mechanism predominated, while the latter mechanism governed for larger diameter wires with shorter embedment lengths. A 3-D non-linear finite element model (FEM) was developed to predict the pull-out behavior. A cohesive zone model (CZM) was used to model the interface. A parametric study was conducted using the FEM to quantify the parameters of the cohesive zone model. The results demonstrate that the proposed modeling approach can be used to characterize the bond behavior of superelastic SMA wires embedded in FRP composites. (C) 2015 Elsevier Ltd. All rights reserved.
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