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Simulating damage onset and evolution in fully bio-resorbable composite under three-point bending.

Xi Gao1, Menghao Chen2, Xiaogang Yang1

  • 1International Doctoral Innovation Centre, University of Nottingham Ningbo China, 315100, China.

Journal of the Mechanical Behavior of Biomedical Materials
|March 4, 2018
PubMed
Summary
This summary is machine-generated.

A new strain-based damage model accurately predicts the behavior of bio-resorbable composites. The model shows fibre damage initiates failure in these materials, crucial for bone fracture implants.

Keywords:
Bio-resorbable compositeContinuum damage mechanicsFinite element analysisFlexural strength

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Computational Mechanics

Background:

  • Bio-resorbable composites are vital for long bone fracture implants due to their mechanical properties.
  • Understanding damage mechanisms in these composites is critical for predicting implant performance and longevity.

Purpose of the Study:

  • To develop and validate a strain-based damage model for bio-resorbable phosphate glass fibre reinforced composites.
  • To investigate the onset and evolution of damage in both the fibre and matrix phases under three-point bending.
  • To predict the stress-strain relationship and flexural properties of the composite material.

Main Methods:

  • A 3D strain-based damage model was developed, assuming linear elastic behavior for the undamaged material.
  • Two damage variables were introduced to track fibre and matrix damage onset.
  • A finite element (FE) model with an auto-adaptive algorithm was created to implement the constitutive model and perform numerical simulations.
  • Damage evolution laws were based on damage variables and fracture energy of constituent phases.

Main Results:

  • The FE model accurately predicted flexural modulus (around 3% error) and flexural strength (within 2% error) compared to experimental data.
  • Numerical analysis identified the top surface as the most vulnerable area under three-point bending.
  • Damage initiation in the fibre was identified as the primary cause of composite failure.

Conclusions:

  • The developed strain-based damage model effectively predicts the mechanical response and failure mechanisms of bio-resorbable composites.
  • Fibre damage is the critical factor initiating failure in these composites under bending loads.
  • The findings are significant for the design and application of these composites in orthopedic implants.