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A simple technique for characterizing flexible materials using pressurised tubes.

Manuel Rubio1, Joaquín Anatol2, César Barrios-Collado3

  • 1Departamento de Ingeniería Energética y Fluidomecánica and Instituto de las Tecnologías Avanzadas de la Producción (ITAP), Universidad de Valladolid, 47003, Valladolid, Spain. manuel.rubio@uva.es.

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|June 23, 2026
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Summary
This summary is machine-generated.

This study simplifies flexible tube deformation prediction under pressure. For long, slender tubes, a single curve relates deformation to transmural load and thickness, enabling easy material property estimation.

Keywords:
Flexible tubesNeo-Hookean modelShear modulusTransmural pressure

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Area of Science:

  • Solid Mechanics
  • Materials Science
  • Fluid Dynamics

Background:

  • Flexible tubes deform under transmural pressure.
  • Predicting this deformation is crucial for engineering applications.
  • Existing models may lack simplicity for diverse material characterization.

Purpose of the Study:

  • To numerically and experimentally investigate flexible tube deformation under positive transmural pressure.
  • To develop a simplified model for predicting volumetric deformation.
  • To facilitate material characterization through experimental methods.

Main Methods:

  • Asymmetric static simulations using a neo-Hookean material model.
  • Experimental validation with two distinct flexible tube materials.
  • Dimensionless analysis of tube volume variation with transmural load, length, and thickness.

Main Results:

  • Tube deformation is highly dependent on the ratio of transmural pressure to shear modulus (transmural load).
  • For slender tubes, thickness reduction by an order of magnitude requires a similar order reduction in transmural load for equivalent deformation.
  • Tube length has negligible impact on deformation for sufficiently long tubes.

Conclusions:

  • A universal deformation curve exists for long, slender tubes, simplifying prediction.
  • This curve simplifies the estimation of shear modulus using basic experimental setups.
  • The findings facilitate efficient material characterization of flexible tubes.