Residual thermal strains and stresses in nickel aluminide matrix composites
- Resource Type
- Authors
- Anil Saigal; D.S. Kupperman
- Source
- Scripta Metallurgica et Materialia. 25:2547-2552
- Subject
- Nial
Materials science
Metallurgy
General Engineering
chemistry.chemical_element
Tungsten
Residual
Condensed Matter::Materials Science
chemistry.chemical_compound
Matrix (mathematics)
chemistry
Residual stress
Ultimate tensile strength
Fiber
Composite material
computer
computer.programming_language
Nickel aluminide
- Language
- ISSN
- 0956-716X
Thermally induced residual strains and stresses developed during postfabrication cooling in Saphikon/NiAl and tungsten/NiAl high-temperature composites are investigated through three-dimensional elastoplastic finite-element analyses. Average axial and transverse strains in the matrix are found to be tensile and compressive, respectively, and similar for both Saphikon and W-fiber-reinforced NiAl composites. It is suggested that the residual matrix stresses and strains are controlled more by the low-matrix yield stress than by the fiber/matrix expansion mismatch. Residual thermal strains in the matrix of these composites are measured by using a neutron-diffraction technique; the measured axial and transverse strains in the matrix are found to be in agreement with the computed values.