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In situ Photo-rheology Monitors Viscoelastic Changes in Photo-responsive Polymer Networks

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Crack Initiation in Viscoelastic Materials.

Yuval Mulla¹, Giorgio Oliveri², Johannes T B Overvelde²

¹Living Matter Department, AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands.

Physical Review Letters

|July 14, 2018

Summary

This summary is machine-generated.

Viscoelastic materials fracture differently than previously thought due to a microscopic mechanism causing critical crack lengths. This study reveals how local bond dynamics lead to this emergent length scale in macroscopic materials.

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Area of Science:

Materials Science
Physics
Mechanics

Background:

Viscoelastic materials exhibit time-dependent mechanical properties.
Fracture in these materials arises from bond breakage, but the underlying mechanisms for macroscopic systems are not fully understood.

Purpose of the Study:

To elucidate the microscopic mechanism behind the emergence of a critical crack length in viscoelastic materials.
To explain how macroscopic fracture differs from models of microscopically small systems.

Main Methods:

Investigated nonlinear local bond dynamics within viscoelastic materials.
Developed and numerically verified analytical equations describing critical crack length.

Main Results:

Identified a microscopic mechanism where nonlinear bond dynamics lead to an emergent critical crack length.
Demonstrated that this emergent length scale fundamentally alters macroscopic fracture behavior.
Derived analytical equations correlating critical crack length with bond kinetics and applied stress.

Conclusions:

Macroscopic viscoelastic fracture is governed by an emergent critical crack length, distinct from smaller-scale models.
The critical crack length is dependent on local bond dynamics, applied stress, and material properties.