Thermomechanical Behavior of Functionally Graded Materials
Abstract
Functionally graded materials are studied with emphasis on fracture resistance behavior and piezoelectric performance. Several types of metal/ceramic FGM plates are processed and their fracture resistance, Kr as a function of crack length was examined experimentally. The Kr behavior of the FGM plates are explained by two models successfully. Then, a new type of piezoelectric FGM plates are designed by using several models, classical lamination theory, 2D elasticity model and FEM. Based on these models, the optimum microstructure of the FGM layering was identified, leading to larger out-of-plane displacement under the applied electric field, while minimizing the induced stress field, thus, enhancing its fatigue life. The optimum microstructure of the FGM is composed of a number of composite layers(laminae) through the plate thickness such that the top half layering is symmetric with respect to the mid-plane where the electrodes are located at the top, bottom as well as in the mid-plane. Based on the above optimization of the FGM layering, we designed a FGM laminate plate where each lamina consists of continuous piezo fiber composite, and performed rigorous FEM analysis. Finally, concluding remarks and future works are given.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 09, 2000
- Accession Number
- ADA380011
Entities
People
- A. Almajid
- M. Taya
- S. Hudnut
Organizations
- University of Washington