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Progressive Damage Model for Composite Laminates in Hygrothermal Environments.

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Hygrothermal aging degrades carbon fiber composites. A new model predicts failure in these environments, showing a 10.3% strength reduction in T300/5208 composites due to moisture and heat.

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Composite Materials

Background:

  • Carbon fiber-reinforced polymer composites are susceptible to mechanical property degradation from hygrothermal aging.
  • Understanding and predicting failure in these materials under environmental stress is crucial for structural integrity.

Purpose of the Study:

  • To develop and validate a three-dimensional progressive damage model for predicting composite structure failure in hygrothermal environments.
  • To analyze the effects of hygrothermal aging on the mechanical properties and failure mechanisms of T300/5208 composites.

Main Methods:

  • Development of a UMAT subroutine within finite element analysis software to simulate damage evolution.
  • Experimental testing including moisture absorption and three-point bending tests on T300/5208 specimens under hygrothermal conditions (70 °C, 85% RH).
  • Microscopic analysis (digital microscope, FSEM) to observe cross-sections and fracture morphology.

Main Results:

  • The proposed model accurately predicts failure modes and damage evolution in hygrothermal environments.
  • Saturated moisture absorption in T300/5208 composites reached approximately 0.56%.
  • Hygrothermal aging led to a 10.3% reduction in the flexural strength of the T300/5208 composite laminate.

Conclusions:

  • The developed progressive damage model is effective for assessing composite behavior under hygrothermal aging.
  • Hygrothermal exposure significantly impacts the mechanical performance of carbon fiber composites.
  • Detailed analysis of fracture morphology provides insights into the hygrothermal aging mechanism.