Understanding of Materials State and its Degradation using Non-Linear Ultrasound (NLU) Approaches

Abstract

Nonlinear ultrasonic (NLU) harmonic generation to a harmonic wave amplitude input has been simulated in 1D and in 2D using a Mass Spring Lattice Model (MSLM). Previously a Finite Difference Time Domain (FDTD) model was developed in this project. The MSLM model is expected to have improved application for the modeling of the nonlinear behavior of the ultrasonic wave propagation in isotropic and anisotropic materials systems. The 1D MSLM model was developed and the NLU behavior has been simulated and verified using previously reported data. The incorporation of the nonlinear parameters in the 2-D model is currently underway.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 2011
Accession Number
ADA547688

Entities

People

  • Krishnan Balasubramaniam

Organizations

  • Indian Institutes of Technology

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Amplitude
  • Demographic Cohorts
  • Elastic Waves
  • Frequency
  • Materials
  • Modulus Of Elasticity
  • Secondary Waves
  • Simulations
  • Stress Strain Relations
  • Stresses
  • Time Domain
  • Time Intervals
  • Ultrasounds
  • Wave Equations
  • Wave Phenomena
  • Wave Propagation
  • Waves

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Personnel Management and Statistics in the Military and Department of Defense