Abstract
In this work, three-dimensional metal-matrix composites (MMCs) reinforced by shape memory alloy (SMA) wires are modeled and simulated, by adopting an SMA constitutive model accounting for elastic deformation, phase transformation and plastic behavior. A modeling method to create composites with pre-strained SMA wires is also proposed to improve the self-healing ability. Experimental validation is provided with a composite under three-point bending. This modeling method is applied in a series of finite element simulations to investigate the self-healing effects in pre-cracked composites, especially the role of the SMA reinforcement, the softening property of the matrix, and the effect of pre-strain in the SMA. The results demonstrate that SMA reinforcements provide stronger shape recovery ability than other, non-transforming materials. The softening property of the metallic matrix and the pre-strain in SMA are also beneficial to help crack closure and healing. This modeling approach can serve as an efficient tool to design SMA-reinforced MMCs with optimal self-healing properties that have potential applications in components needing a high level of reliability.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1-10 |
| Number of pages | 10 |
| Journal | Mechanics of Materials |
| Volume | 103 |
| DOIs | |
| State | Published - Dec 1 2016 |
Funding
This work was performed under the following financial supports of NASA Aeronautics Research Mission Directorate (ARMD) through grant number NNX13AR52A and Department of Energy through grant number DE-SC0010594.
Keywords
- Crack closure
- Digital image correlation
- Finite element model
- Phase transformation
- Pre-strain
ASJC Scopus subject areas
- Instrumentation
- General Materials Science
- Mechanics of Materials