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Full-Field Indentation Damage Measurement Using Digital Image Correlation.

Elías López-Alba1, Francisco A Díaz-Garrido2

  • 1Departamento de Ingeniería Mecánica y Minera, Campus las Lagunillas, Universidad de Jaén, 23071 Jaén, Spain. elalba@ujaen.es.

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Summary

This study introduces a new method using full-field indentation measurements to analyze contact damage in thin plates, revealing how thickness affects bending and plastic deformation during contact events.

Keywords:
3D digital image correlationcontactdamageindentation

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Solid Mechanics

Background:

  • Characterizing contact-induced damage in thin plates is crucial for structural integrity.
  • Existing methods often lack the resolution to capture complex deformation behaviors.
  • Understanding the interplay between contact, bending, and material plasticity is essential.

Purpose of the Study:

  • To present a novel full-field indentation measurement approach for quantifying contact effects in thin plates.
  • To evaluate indentation damage under bending deformation caused by sphere-plate contact.
  • To investigate the influence of plate thickness and material behavior on contact damage.

Main Methods:

  • Utilizing 3D Digital Image Correlation (3D-DIC) to measure out-of-plane displacements.
  • Conducting indentation tests on aluminum thin plates with a rigid sphere.
  • Employing 3D-DIC data for indirect measurement of contact area during loading/unloading.

Main Results:

  • Observed symmetrical contact damage distribution due to indenter symmetry.
  • Identified shearing deformation in aluminum plates due to high plasticity.
  • Contact damage area increased with plate thickness, correlating with reduced bending.
  • Quantified elastic recovery and permanent indentation damage post-unloading.

Conclusions:

  • The proposed full-field method effectively characterizes and quantifies contact-induced damage and deformation in thin plates.
  • Plate thickness significantly influences bending deformation and the extent of contact damage.
  • This approach offers substantial improvements over pointwise measurement techniques for contact analysis.