A comparison of analysis tools for predicting the inelastic cyclic response of cross-ply titanium matrix composites

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:536391

Kroupa, J L; Coker, D ^[1]; Neu, R W; Nicholas, T ^[2]; Robertson, D D; Mall, S ^[3]

---

1. Univ. of Dayton Research Inst., OH (United States)
2. Wright Lab. Materials Directorate, Wright-Patterson AFB, OH (United States)
3. Air Force Inst. of Tech., Wright-Patterson AFB, OH (United States). Dept. of Aeronautics and Astronautics

Several micromechanical models that are currently being used for predicting the thermal and mechanical behavior of a cross-ply, [0/90], titanium matrix composite are evaluated. Six computer programs or methods are compared: (1) VISCOPLY; (2) METCAN; (3) FIDEP, an enhanced concentric cylinder model; (4) LISOL, a modified method of cells approach; (5) an elementary approach where the [90] ply is assumed to have the same properties as the matrix; and (6) a finite element method. Comparisons are made for the thermal residual stresses at room temperature resulting from processing, as well as for stresses and strains in two isothermal and two thermomechanical fatigue test cases. For each case, the laminate response of the models is compared to experimental behavior, while the responses of the constituents are compared among the models. The capability of each model to predict frequency effects, inelastic cyclic strain (hysteresis) behavior, and strain ratchetting with cycling is shown. The basis of formulation for the micromechanical models, the constitutive relationships used for the matrix and fiber, and the modeling technique of the [90] ply are all found to be important factors for determining the accurate behavior of the [0/90] composite.

• OSTI ID: 536391
• Report Number(s): CONF-940399--; ISBN 0-8031-2039-7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
99 GENERAL AND MISCELLANEOUS
COMPARATIVE EVALUATIONS
COMPOSITE MATERIALS
COMPUTER CODES
FATIGUE
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
TITANIUM BASE ALLOYS