Design of Time-Dependent Composite Material Structures Using the Quasi-Elastic Method 821087

The results of a viscoelastic material characterization of SMC-50 are used to illustrate the use of the quasi-elastic design method on two simple engineering structures. The importance of accounting for material time-dependence is dramatically emphasized, as are the pitfalls and limitations of the quasi-elastic method. The complete linear viscoelastic theory is briefly presented and the quasi-elastic formulae are derived therefrom. A brief discussion of the various correspondence principles which allow the use of less complicated elasticity solutions and design techniques are presented. Software routines, written for the HP-41 desktop calculator, which illustrate applications of the results of a viscoelastic characterization in quasi-elastic design and analysis are included and used throughout the paper to demonstrate the ease with which this method may be used.


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