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Cavitation in inhomogeneous soft solids.

Jingtian Kang1, Changguo Wang, Huifeng Tan

  • 1Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China. wangcg@hit.edu.cn.

Soft Matter
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Cavitation in soft solids occurs when a cavity expands unboundedly under hydrostatic tension. This study reveals that inhomogeneity in soft solids significantly alters cavitation behavior, leading to varied tension-cavity size relationships.

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Area of Science:

  • Solid mechanics
  • Materials science
  • Continuum mechanics

Background:

  • Cavitation in homogeneous neo-Hookean solids is well-understood, occurring when hydrostatic tension reaches 2.5 times the shear modulus.
  • Previous research primarily assumes homogeneous mechanical properties in soft solids for studying cavitation.
  • Understanding cavitation is crucial for applications involving soft materials, such as biological tissues and polymers.

Purpose of the Study:

  • To investigate the phenomenon of cavity expansion in inhomogeneous soft solids.
  • To analyze how material inhomogeneity affects the cavitation process and the relationship between applied tension and cavity size.
  • To compare cavitation behavior in inhomogeneous solids with that in homogeneous ones.

Main Methods:

  • Analytical formulation to model cavity expansion in inhomogeneous solids.
  • Finite element simulations to complement analytical findings and visualize deformation.
  • Parametric studies exploring the influence of geometry and material property gradients.

Main Results:

  • Cavitation in inhomogeneous soft solids exhibits significantly different behavior compared to homogeneous solids.
  • The relationship between applied hydrostatic tension and cavity size can be either monotonic or non-monotonic.
  • The specific geometry and material property distribution dictate the observed cavitation behavior.

Conclusions:

  • Material inhomogeneity plays a critical role in determining cavitation dynamics in soft solids.
  • The non-monotonic relationship observed in some inhomogeneous cases challenges traditional understanding of cavitation thresholds.
  • These findings provide valuable insights for predicting and controlling cavitation in complex soft materials.