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Optimization of residual stresses in mmc's through process parameter control and the use of heterogeneous compensating/compliant interfacial layers. optcomp2 user's guide
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Salzar, Robert S. Pindera, Marek-Jerzy |
| Copyright Year | 1996 |
| Description | A user's guide for the computer program OPTCOMP2 is presented in this report. This program provides a capability to optimize the fabrication or service-induced residual stresses in unidirectional metal matrix composites subjected to combined thermomechanical axisymmetric loading by altering the processing history, as well as through the microstructural design of interfacial fiber coatings. The user specifies the initial architecture of the composite and the load history, with the constituent materials being elastic, plastic, viscoplastic, or as defined by the 'user-defined' constitutive model, in addition to the objective function and constraints, through a user-friendly data input interface. The optimization procedure is based on an efficient solution methodology for the inelastic response of a fiber/interface layer(s)/matrix concentric cylinder model where the interface layers can be either homogeneous or heterogeneous. The response of heterogeneous layers is modeled using Aboudi's three-dimensional method of cells micromechanics model. The commercial optimization package DOT is used for the nonlinear optimization problem. The solution methodology for the arbitrarily layered cylinder is based on the local-global stiffness matrix formulation and Mendelson's iterative technique of successive elastic solutions developed for elastoplastic boundary-value problems. The optimization algorithm employed in DOT is based on the method of feasible directions. |
| File Size | 4900333 |
| Page Count | 108 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19970001593 |
| Archival Resource Key | ark:/13960/t0tr0v21j |
| Language | English |
| Publisher Date | 1996-09-01 |
| Access Restriction | Open |
| Subject Keyword | Composite Materials Viscoelasticity Stiffness Matrix Interlayers Boundary Value Problems Process Control Industry Concentric Cylinders User Manuals Computer Programs Computer Programs Micromechanics User Requirements Heterogeneity Algorithms Iterative Solution Viscoplasticity Fiber-matrix Interfaces Homogeneity Nonlinearity Metal Matrix Composites Mathematical Models Microstructure Thermal Stresses Residual Stress Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
