Accession Number:

ADA165688

Title:

Cumulative Damage Model for Advanced Composite Materials.

Descriptive Note:

Final rept. Oct 83-Jan 85,

Corporate Author:

GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV

Report Date:

1985-06-01

Pagination or Media Count:

168.0

Abstract:

This reports details the model verification activity of Phase III of this program and summarizes the modeling effort conducted over the entire program duration. In the Phase III effort, the model was used to predict the specimen response using four previously unstudied parameter variations. The variations consisted of introduction of a different specimen width than that used in Phase I and II, a new stacking sequence, new loading conditions applied to previously studied stacking sequence, and a different material system T300V378A as opposed to AS3501 used throughout Phases I and II. In each case the model predictions were obtained prior to the specimen testing in fact, the model was used to determine the load conditions used in the test program. In all cases, predicted lifetimes were within the same decade-- indicating good agreement between the theory and experiment for fatigue analysis. Also discussed are the methodologies associated with applying the model in tension- tension, tension-compression, compression-compression, and mixed block loading situations. Sensitivity of the model to various parameters in these loading conditions is demonstrated. Keywords Cumulative damage Stacking sequence Fatigue testing Multiple load histories Non destructive testing Stiffness changeResidual strength Property degradation.

Subject Categories:

  • Laminates and Composite Materials
  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE