Standard Article

Thermomechanical Models

Physical Monitoring Principles

Physics-based and Data-driven Modeling of Structural Component Behavior

  1. Minh P. Luong

Published Online: 15 SEP 2009

DOI: 10.1002/9780470061626.shm005

Encyclopedia of Structural Health Monitoring

Encyclopedia of Structural Health Monitoring

How to Cite

Luong, M. P. 2009. Thermomechanical Models. Encyclopedia of Structural Health Monitoring. .

Author Information

  1. Ecole Polytechnique, LMS CNRS UMR7649, Palaiseau, France

Publication History

  1. Published Online: 15 SEP 2009

Abstract

The thermal effects due to thermomechanical coupling in solids have been identified within the context of the thermodynamics of irreversible processes. This article aims to illustrate the use of infrared thermography as a nondestructive, real-time, and noncontact technique to detect, observe, and evaluate the evolution of temperature changes caused by the diverse physical processes occurring in solids under loading. The results obtained highlight the advantages of differential infrared thermography. This technique minimizes the thermal noise in real or industrial environments and thus facilitates the detection, discrimination, and interpretation of the diverse dissipative phenomena involved in these nonlinear coupled thermomechanical effects. Stress and strain concentrations occurring in loaded materials and structural components result in localized forces that are sufficient to promote plasticity. In addition to traditional techniques of mechanical strength evaluation, it provides under service loading a ready evaluation of a limit of acceptable damage, beyond which the material will be destroyed, or of fatigue resistance under cyclic excitations or dynamic solicitations. The work suggests various potential applications of this thermal technique in diverse engineering fields: nondestructive testing using thermal conduction phenomena, elastic stress measurements, localization of dissipative phenomena, and rapid evaluation of endurance limit for industrial materials.

Keywords:

  • damage detection;
  • dissipation mechanisms;
  • endurance limit;
  • infrared thermography;
  • leakage detection;
  • thermomechanical coupling;
  • threshold of acceptable damage