Analyzing structural durability in the frequency domain
First Claim
1. A method of analyzing a durability of a structure through a plurality of operations comprising:
- for each one of a plurality of materials of the structure, performing load-controlled testing on one or more samples of each one of the plurality of materials to relate each of a plurality of critical strain invariants of each one of the plurality of materials to cyclic rates of strain invariant accumulation and frequencies associated with the cyclic rates;
characterizing each of the plurality of materials based on effective properties of each of the plurality of materials to obtain material characterizations, the effective properties including the cyclic rates of strain invariant accumulation of each one of the plurality of materials;
using the effective properties of each of the plurality of materials and a geometrical definition of the structure to obtain a parametric model including a plurality of elements;
applying load conditions to the parametric model;
using the material characterizations to determine frequency responses of the plurality of elements to the load conditions; and
for each one of the plurality of elements, using the determined frequency responses and the plurality of critical strain invariants to determine whether damage is indicated at each one of the plurality of elements.
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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.
14 Citations
20 Claims
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1. A method of analyzing a durability of a structure through a plurality of operations comprising:
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for each one of a plurality of materials of the structure, performing load-controlled testing on one or more samples of each one of the plurality of materials to relate each of a plurality of critical strain invariants of each one of the plurality of materials to cyclic rates of strain invariant accumulation and frequencies associated with the cyclic rates; characterizing each of the plurality of materials based on effective properties of each of the plurality of materials to obtain material characterizations, the effective properties including the cyclic rates of strain invariant accumulation of each one of the plurality of materials; using the effective properties of each of the plurality of materials and a geometrical definition of the structure to obtain a parametric model including a plurality of elements; applying load conditions to the parametric model; using the material characterizations to determine frequency responses of the plurality of elements to the load conditions; and for each one of the plurality of elements, using the determined frequency responses and the plurality of critical strain invariants to determine whether damage is indicated at each one of the plurality of elements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for analyzing a durability of a structure, the system comprising at least one processor and memory configured to:
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characterize each of a plurality of materials of the structure based on effective properties of the plurality of materials to obtain material characterizations, the effective properties including, for each of a plurality of critical strain invariants of the plurality of materials, a plurality of cyclic rates of strain invariant accumulation and frequencies associated with the plurality of cyclic rates of strain invariant accumulation of each one of the plurality of materials; use the effective properties of the plurality of materials and a geometrical definition of the structure to obtain a parametric model including a plurality of elements; apply load conditions to the parametric model; use the material characterizations to determine frequency responses of the plurality of elements to the load conditions, and for each one of the plurality of elements, use the determined frequency responses and the plurality of critical strain invariants to determine whether damage is indicated at each one of the plurality of elements. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A non-transitory, machine-readable medium stored on a memory, for use in analyzing a durability of a structure, the machine-readable medium configured for:
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characterizing each of one of a plurality of materials of the structure based on effective properties of each one of the plurality of materials to obtain material characterizations, the effective properties including, for each of a plurality of critical strain invariants of each one of the plurality of materials, a plurality of cyclic rates of strain invariant accumulation and frequencies associated with the plurality of cyclic rates of strain invariant accumulation of each one of the plurality of materials; using the effective properties of the plurality of materials and a geometrical definition of the structure to obtain a parametric model including a plurality of elements; applying load conditions to the parametric model; using the material characterizations to determine frequency responses of the plurality of elements to the load conditions; for each one of the plurality of elements, using the determined frequency responses and the plurality of critical strain invariants to determine whether damage is indicated at each one of the plurality of elements; using strain tensors of the plurality of elements to analyze progression of indicated damage relative to the plurality of elements; and accounting for the progression in the parametric model. - View Dependent Claims (17, 18, 19, 20)
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Specification