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Analyzing structural durability in the frequency domain

  • US 10,309,883 B2
  • Filed: 11/26/2014
  • Issued: 06/04/2019
  • Est. Priority Date: 03/14/2006
  • Status: Active Grant
First Claim
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1. A method of analyzing durability of a composite structure, comprising:

  • performing load-controlled testing of samples of a plurality of materials to be used as part of a structure, the plurality of materials comprising at least one composite material, wherein the load-controlled testing includes determining at least one effective material property of the at least one composite material based on an accumulative invariant approach;

    forming a parametric model of the structure based on the load-controlled testing of the samples and a geometric definition of the structure, wherein the parametric model includes a plurality of elements based on the geometric definition of the structure, and the at least one effective material property of the at least one composite material; and

    determining, using the parametric model, failure characteristics of the structure under load conditions by determining frequency responses of the plurality of elements to data of the load conditions applied to the plurality of elements in the parametric model,wherein the at least one effective material property is based on interactions of a plurality of phases of the at least one composite material, the phases including a polymeric matrix phase and a fiber reinforcement phase, andwherein determining the failure characteristics of the structure further comprises assessing failure within the fiber reinforcement phase of the at least one composite material and determining a percentage of plies that have failed.

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