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Dynamic Crack-Front Deformations in Cohesive Materials.

Thibault Roch1, Mathias Lebihain2, Jean-François Molinari1

  • 1Civil Engineering Institute, Materials Science and Engineering Institute, Ecole Polytechnique Fédérale de Lausanne, Station 18, CH-1015 Lausanne, Switzerland.

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Summary
This summary is machine-generated.

Investigating crack front deformations in heterogeneous materials reveals local property variations. Our new model accounts for the process zone size, improving predictions of material damage and microstructure properties.

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Area of Science:

  • Solid Mechanics
  • Materials Science
  • Fracture Mechanics

Background:

  • Crack fronts deform due to material heterogeneities, offering insights into local property variations and potential out-of-plane damage.
  • Existing models often overlook the influence of the process zone size, a finite dissipation length scale behind the crack tip.
  • This neglected scale effect impacts crack front deformation, though crack dynamics can mitigate these effects.

Purpose of the Study:

  • To develop and validate a theoretical framework for dynamic crack-front deformations in heterogeneous cohesive materials.
  • To incorporate the influence of the process zone size into models of crack propagation.
  • To provide a foundation for identifying effective material properties of microstructures through crack deformation analysis.

Main Methods:

  • Development of a theoretical framework for dynamic crack-front deformations.
  • Numerical validation of the proposed theoretical model.
  • Analysis of scale effects introduced by the process zone size.

Main Results:

  • A validated theoretical framework for dynamic crack-front deformations in heterogeneous cohesive materials was established.
  • The influence of the process zone size on crack front deformation was quantified.
  • The framework demonstrates how crack dynamics interact with material heterogeneities and process zone effects.

Conclusions:

  • The developed framework accurately models dynamic crack-front deformations in heterogeneous materials.
  • Accounting for the process zone size is crucial for understanding scale effects in crack propagation.
  • This work is a significant step towards characterizing microstructural properties via crack behavior analysis.