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Related Experiment Videos

Finite element stress analysis of a push-out test. Part 1: Fixed interface using stress compatible elements.

A Shirazi-Adl1

  • 1Department of Mechanical Engineering, Ecole Polytechnique de Montreal, Quebec, Canada.

Journal of Biomechanical Engineering
|February 1, 1992
PubMed
Summary

This study developed stress-compatible finite elements for push-out tests, revealing complex interface stresses that challenge common assumptions in orthopedic applications and guiding optimal test design.

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Area of Science:

  • Finite Element Analysis
  • Solid Mechanics
  • Materials Science

Background:

  • Push-out tests are common for evaluating interface bond strength.
  • Existing models often simplify interface stress assumptions.
  • Accurate stress analysis is crucial for understanding material behavior at interfaces.

Purpose of the Study:

  • To develop and apply interelement stress-compatible finite elements for accurate stress analysis of push-out tests.
  • To investigate the influence of material properties, boundary conditions, and loading on interface stresses.
  • To challenge and refine assumptions used in orthopedic pull-out test interpretations.

Main Methods:

  • Development of axisymmetric finite element models with enforced stress continuity via a penalty procedure.

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  • Simulation of various material properties, boundary conditions, and loadings (axial compression and torque).
  • Analysis of interface stresses, including shear and radial normal stresses.

    • Main Results:

    • Achieved identical interelement stresses and displacements even with dissimilar materials.
    • Revealed complex interface stress states dependent on geometry, materials, boundary conditions, and loading.
    • Demonstrated significant non-uniform shear stress and large radial normal stresses, contradicting typical assumptions.

    Conclusions:

    • The developed finite elements provide a more accurate stress analysis for push-out tests.
    • Common assumptions in orthopedic pull-out tests may not be valid due to complex stress states.
    • Further analysis can guide the design of optimal pull-out tests for improved interface bond strength evaluation.