Micromechanics of fracture in elastomers

Gent, A. N.; Pulford, C. T. R.

doi:10.1007/bf02396933

Cited by 81 publications

(27 citation statements)

References 17 publications

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“…The tear surfaces for a neat PDMS specimen and from a sample with 25 wt % microcapsules are compared in Figure 4. The overall surface features in the microcapsule filled specimen are rougher and the periodic cusps, present on most elastomer tear surfaces, [16] are disrupted. The microcapsule induced morphologies on the tear surface (e.g., tail structures) provide evidence of energy dissipation mechanisms such as crack pinning.…”

Section: Microcapsule Effect On Polymer Propertiesmentioning

confidence: 99%

A Self‐Healing Poly(Dimethyl Siloxane) Elastomer

Keller

White

Sottos

2007

Adv Funct Materials

383

276

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Self‐healing functionality is imparted to a poly(dimethyl siloxane) (PDMS) elastomer. This new material is produced by the incorporation of a microencapsulated PDMS resin and a microencapsulated crosslinker into the PDMS matrix. A protocol based on the recovery of tear strength is introduced to assess the healing efficiency for these compliant polymers. While most PDMS elastomers possess some ability to re‐mend through surface cohesion, the mechanism is generally insufficient to produce significant recovery of initial material strength under ambient conditions. Self‐healing PDMS specimens, however, routinely recover between 70–100 % of the original tear strength. Moreover, the addition of microcapsules increases the tear strength of the PDMS. The effect of microcapsule concentration on healing efficiency is also investigated.

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Section: Microcapsule Effect On Polymer Propertiesmentioning

confidence: 99%

A Self‐Healing Poly(Dimethyl Siloxane) Elastomer

Keller

White

Sottos

2007

Adv Funct Materials

383

276

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“…These secondary cracks will not be collinear, but will be separated somewhat in the vertical (strain) direction. Then, as they grow in size, they will eventually link up and form new crack surface on a macroscopic scale (Bascom 1977;Fukahori and Andrews 1978;Bhowmick et al 1980;Setua and De 1983;Gent and Pulford 1984;Goldberg et al 1988;Pandey and Mathur 2003).…”

Section: Introductionmentioning

confidence: 96%

Steady-state crack growth in rubber-like solids

Kroon

2011

Int J Fract

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The fracture toughness of rubber-like materials depends on several factors. First there is the surface energy required to create new crack surface at the crack tip. Second, a significant amount of energy is dissipated through viscoelastic processes in the bulk material around the crack tip. Third, if the crack propagates very rapidly, inertia effects will come into play and contribute to the fracture toughness. In the present study, a computational framework for studying high-speed crack growth in rubber-like solids under conditions of steady-state is proposed. Effects of inertia, viscoelasticity and finite strains are included. The main purpose of the study is to study the contribution of viscoelastic dissipation to the total work of fracture required to propagate a crack in a rubber-like solid. The model was fully able to predict experimental results in terms of the local surface energy at the crack tip and the total energy release rate at different crack speeds. In addition, the predicted distributions of stress and dissipation around the propagating crack tip are presented.

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“…[52][53][54] Gent and Pulford correlated the tear strength of a polymer with the fracture surface morphology. 55 They measured the step spacing on the fracture surface and concluded that strong materials show closely spaced steps while weak materials show smooth torn surfaces. Some fine fibrous structures observed in the N 30 sample are due to intrinsic crazes.…”

Section: Fractographymentioning

confidence: 99%