Fatigue monitoring for composite materials

US9476815B2 · kind B2 · utility

Assignee

• BOARD OF SUPERVISORS OF LOUISIANA STATE UNIVERSITY AND AGRICULTURAL AND MECHANICAL COLLEGE · US

Inventors

• Michael M. Khonsari · Baton Rouge, US
• Mehdi Naderi Abadi · Miami, US

Key dates

• Filing date: Feb 16, 2012
• Grant date: Oct 25, 2016
• Expiry date: Jul 6, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0694
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Fatigue failure in composite materials can be successfully modeled and predicted by monitoring irreversible gains in entropy. Permanent degradations in composites are marked by irreversible processes that are characterized by increases in entropy. By measuring changes in entropy, one can model and predict the deterioration and failure of composites. The technique may be used to predict the deterioration and failure of composites under essentially any type of loading—constant, variable, bending, torsion, tension, compression, or other.