Analyzing structural durability in the frequency domain

US9020786B2 · kind B2 · utility

Assignee

• The Boeing Company · US

Inventors

• Mostafa Rassaian · Bellevue, US
• Jonathan H. Gosse · Issaquah, US
• Stephen Christensen · Issaquah, US

Key dates

• Filing date: Nov 30, 2007
• Grant date: Apr 28, 2015
• Expiry date: Jul 5, 2032

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/40
• WIPO field: Measurement
• WIPO sector: Instruments

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.