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Textile Composite Damage Analysis Taking into Account the Forming Process.

Marjorie Jauffret1, Aldo Cocchi2, Naim Naouar1

  • 1INSA-Lyon, LaMCoS CNRS, University de Lyon, 69621 Lyon, France.

Materials (Basel, Switzerland)
|December 1, 2020
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Summary

Manufacturing composite materials alters yarn angles, affecting damage behavior. This study proposes a new damage calculation method accounting for these angle changes for accurate composite part design.

Keywords:
damagefibre orientationforminghypoelasticitytextile composite

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Composite Materials

Background:

  • Composite material manufacturing, specifically woven prepreg or dry preform formation, alters the internal structure.
  • Changes in the angle between warp and weft yarns significantly influence the damage behavior of the consolidated composite.
  • Accurate composite part dimensioning requires considering these manufacturing-induced structural modifications during damage calculation.

Purpose of the Study:

  • To propose a novel damage calculation approach for consolidated textile composites.
  • To incorporate the effects of yarn orientation changes due to forming into the damage analysis.
  • To enable more precise dimensioning of composite parts by accounting for structural modifications.

Main Methods:

  • Simulating fabric draping using hypoelastic behavior to determine post-forming yarn angles.
  • Employing two orthogonal frames aligned with warp and weft directions for stress integration.
  • Modeling damage using Continuum Damage Mechanics (CDM) by representing non-perpendicular woven composites as two equivalent Unidirectional (UD) plies.

Main Results:

  • The proposed method successfully calculates damage in textile composites with altered yarn angles.
  • Simulations of bias extension and hemispherical forming specimens demonstrated significant modifications in calculated damage when angle changes were considered.
  • The study validates the impact of forming-induced yarn reorientation on composite damage.

Conclusions:

  • The proposed damage calculation approach accurately reflects the influence of forming on textile composite behavior.
  • Accounting for yarn angle changes during composite design is crucial for reliable structural analysis and dimensioning.
  • This methodology enhances the prediction of damage in complex composite structures manufactured via textile forming processes.