Residual thermal strains and stresses in nickel aluminide matrix composites

Journal Article · Thu Oct 31 23:00:00 EST 1991 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(91)90066-A· OSTI ID:6048769

Saigal, A; Kupperman, D S ^[1]

---

1. Tufts University, Medford, MA (USA) Argonne National Laboratory, IL (USA)

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. 11 refs.

• OSTI ID: 6048769
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 25; ISSN SCRME; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM ALLOYS
COHERENT SCATTERING
COMPOSITE MATERIALS
DIFFRACTION
ELEMENTS
FIBERS
FINITE ELEMENT METHOD
INTERMETALLIC COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
METALS
NEUTRON DIFFRACTION
NICKEL ALLOYS
NUMERICAL SOLUTION
RESIDUAL STRESSES
SCATTERING
STRESS ANALYSIS
STRESSES
THERMAL STRESSES
TRANSITION ELEMENTS
TUNGSTEN
YIELD STRENGTH