Analyzing structural durability in the frequency domain
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of analyzing the durability of a structure. Load-controlled testing is performed on samples of a composite material of the structure to relate critical strain invariants of the material to cyclic rates of strain invariant accumulation and frequencies associated with the cyclic rates. The material is characterized based on effective properties of the material, including the cyclic rates of strain invariant accumulation. Laminate properties and a geometrical definition of the structure are used to obtain a parametric model. Material characterizations are used to determine model element frequency responses to applied load conditions. Each element'"'"'s frequency responses and critical strain invariants are used to determine whether damage is indicated at the element. Progression of damage is tracked and accounted for in the model.
-
Citations
21 Claims
-
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, and wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A system for analyzing the durability of a structure, the system comprising at least one processor and memory configured to:
-
receive at least one effective material property of a plurality of materials from load-controlled testing of samples of the 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 the at least one effective material property of the at least one composite material based on an accumulative invariant approach; form 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 determine, 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, and wherein 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. - View Dependent Claims (15, 16, 17, 18)
-
-
19. A non-transitory medium containing processor-readable instructions when performed by a processor cause the processor to perform operations of:
-
receiving at least one effective material property of a plurality of materials from load-controlled testing of samples of the 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 the 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, and wherein 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. - View Dependent Claims (20, 21)
-
Specification