ENGINEERING RESEARCH.

Abstract

A data reduction method was developed which corrects for finite loading times in viscoelastic stress relaxation and creep tests which are defined mathematically in terms of zero-loading times. This method, which requires the use of a controlled loading, is demonstrated for a linear strain rise in a tensile stres relaxation test. Results are given for other types of strain application. A quick, easy method of fitting a set of experimental stress relaxation data with a series of exponential terms was demonstrated. A FORTRAN program has been written for the simultaneous solution of X(1 which is less than or equal to X which is less than or equal to 7) diffusion processes (of which heat conduction is a special case) coupled to Y(0 which is less than or equal to Y which is less than or equal to 7) chemical reactions in the unsteady state and in a generalized, one-dimensional, single-layer geometry. The program and its operation are described in detail. A printout of the program in FORTRAN statements is provided. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 15, 1963
Accession Number
AD0424650

Entities

People

  • W. H. Groetzinger Iii.

Tags

DTIC Thesaurus Topics

  • Chemical Reactions
  • Creep
  • Creep Tests
  • Data Reduction
  • Diffusion
  • Engineering
  • Geometry
  • Mechanical Properties
  • Physical Properties

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Dynamics.
  • Mechanical Engineering/Mechanics of Materials.