Viscoelastic behavior of opto-mechanical properties and its application to viscoelastic fracture studies

In experimental fracture studies of viscoelastic polymers presently available optical measurement methods need to be modified to account for the rate sensitivity of the physical properties. Here, photoviscoelastic behavior is examined for the purpose of determining the mechanical state of stress and...

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Bibliographic Details
Published in:International journal of fracture 1986-12, Vol.32 (4), p.265-283
Main Authors: KIM, K.-S, DICKERSON, K. L, KNAUSS, W. G
Format: Article
Language:English
Subjects:
Applied sciences
crack propagation
Exact sciences and technology
mechanical properties
Organic polymers
Physicochemistry of polymers
polymers
Properties and characterization
strain
stress
stress strain relations
viscoelasticity
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Summary:In experimental fracture studies of viscoelastic polymers presently available optical measurement methods need to be modified to account for the rate sensitivity of the physical properties. Here, photoviscoelastic behavior is examined for the purpose of determining the mechanical state of stress and strain at the tip of a crack moving through a viscoelastic solid. The linearly opto-mechanical constitutive relation is derived from mechanical and dielectric relaxation functions for thermorheologically simple solids. Computations of the caustic, based on the square root singular stress field at the tip of a steadily propagating crack show that the crack speed has a pronounced effect on the size of the caustic but leaves the shape virtually unchanged. A knowledge of the phenomenological opto-mechanical properties of the polymer allows thus the determination of the stress intensity factor in (linearly) viscoelastic solids.
ISSN:0376-9429
1573-2673
DOI:10.1007/BF00018545