Experimental full field analysis for dynamic fracture of elastomer membranes

Corre, Thomas; Coret, Michel; Verron, Erwan; Leblé, Bruno; Lay, F. Le

doi:10.1007/s10704-020-00447-1

Cited by 12 publications

(23 citation statements)

References 47 publications

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“…Some studies, such as in Petersan et al (2004), Chen et al (2011), Marder (2006), performed on elastomers reveal that the cracks can travel at speeds that exceed the speed of elastic shear wave, c s , when subjected to high stretch ratios. Recent experiments by Corre et al (2020), Morishita et al (2016) also confirm this observation. As a reminder, Linear Elastic Fracture Mechanics (LEFM) forbids the crack speed from exceeding c R (Freund 1990) for a Mode-I crack.…”

Section: Introductionsupporting

confidence: 59%

“…In this article, the experiments performed by Corre et al (2020) will be examined further to check for the presence of discontinuities in velocity and strain in the transonic regime. Such fronts have been observed in the impact and retraction tests performed on latex rubber and SBR in Niemczura and Ravi-Chandar (2011a, b), although their existence does not match the theoretical predictions using a Hyperelastic model based on the theory in Knowles (2002).…”

Section: Introductionmentioning

confidence: 99%

“…The FE software ABAQUS (Abaqus 2014) will be used. Section 2 will present the results and additional observations of the experiments performed in Corre et al (2020). Section 3 contains the methodology used and some numerical analysis performed using various constitutive models and the resulting observations.…”

Section: Introductionmentioning

confidence: 99%

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The role played by viscoelasticity in the bulk material during the propagation of a dynamic crack in elastomers

2021

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Investigation of dynamic fracture of elastomers can still be considered to be a relatively open area. When a sheet of elastomer is stretched in a tensile machine and a crack is introduced, the crack propagates at a speed that depends on the initial stretch level. There are instances where this speed is noted to exceed the shear wave speed based on the elastic modulus under high imposed stretches. Such cracks are called transonic cracks. It was usually hypothesized that either the hyperelastic or viscoelastic stiffening of the bulk material raises the wave speeds resulting in crack speeds entering the transonic regime. This article revisits the experiments performed on Polyurethane elastomers in Corre et al. (Int J Fract 224(1):83-100, 2020) to study the implications of both these hypotheses. Crack propagation has not been explicitly modeled, but the crack speeds are implicitly imposed on the geometry using the boundary conditions extracted from the experimental data. It has been determined that the viscoelasticity in the bulk is needed to describe and understand the transonic cracks in polyurethane elastomer. The inclu-

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Section: Introductionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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The role played by viscoelasticity in the bulk material during the propagation of a dynamic crack in elastomers

2021

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“…For brevity, only the main features of the experimental set-up developed to monitor dynamic crack growth are presented; for more details the interested reader can refer to Corre et al (2020) and extensive datasets are also available (doi: 10.5281/zenodo.4034638).…”

Section: Observing Cracks: Experimental Set-upmentioning

confidence: 99%

“…Alongside with this energetic approach, the precise role of strain in the membrane is investigated with both inflated (Stevenson and Thomas 1979;Moulinet and Adda-Bedia 2015) or plane (Gent and Marteny 1982a;Petersan et al 2004) sheets of elastomer. In very recent works, the detailed strain field around the moving crack has been analysed with more recent full field measurement techniques (Corre et al 2020;Mai et al 2020). As a major result, it is established that crack speed increases with membrane deformation, ultimately reaching a limit which is assumed to be the velocity of the longitudinal waves in the material Moulinet and Adda-Bedia (2015).…”

Section: Introductionmentioning

confidence: 99%

Non steady-state intersonic cracks in elastomer membranes under large static strain

Corre

Coret

Verron

et al. 2021

Journal of Theoretical, Computational and Applied Mechanics

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International audience Dynamic crack propagation in elastomer membranes is investigated; the focus is laid on cracks reaching the speed of shear waves in the material. The specific experimental setup developed to measure crack speed is presented in details. The protocol consists in (1) stretching an elastomer membrane under planar tension loading conditions, then (2) initiating a small crack on one side of the membrane. The crack speed is measured all along the crack path in both reference and actual configurations, including both acceleration and deceleration phases, i.e. non steady-state crack propagation phases. The influence of the prescribed stretch ratio on crack speed is analysed in the light of both these new experiments and the few previously published studies. Conclusions previously drawn for steady-state crack growth are extended to non steady-state conditions: stretch perpendicular to the crack path governs crack speed in intersonic crack propagation regime, and the role of the stretch in crack direction is minor.

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Unraveling Non‐Uniform Strain‐Induced Crystallization Near a Crack Tip in Natural Rubber

Mai,

Yasui,

Tanaka

et al. 2024

Advanced Science

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Strain‐induced crystallization (SIC) in natural rubber (NR) near crack tips significantly enhances crack growth resistance, but understanding the interplay between local strain field and crystallization remains challenging due to confined and heterogeneous characteristics. Using micro‐scale digital image correlation (DIC) and scanning wide‐angle X‐ray diffraction (WAXD, with a narrow 10 µm square beam), this study maps local strain tensor properties and SIC in the vicinity of the crack tip and its peripheral zone (≈3 mm × 1 mm area). The analysis reveals a significant correlation between these properties. In the peripheral zone, there is a noticeable deviation of both the principal strain axis and the crystal orientation from the crack opening direction. These deviations are linearly correlated, which indicates that shear strain plays a significant role in determining the crystal orientation. Crucially, the maximum tensile component in the tensor of local principal strains predominantly dictates local crystallinity. This simplicity is attributed to the limited variation in types of deformation within the SIC region, with corresponding to deformations falling between planar and uniaxial stretching. These findings pave the way for predicting crystallinity distribution using solely strain field data, offering valuable insights into the role of SIC in enhancing the crack growth resistance of NR.

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Experimental full field analysis for dynamic fracture of elastomer membranes

Cited by 12 publications

References 47 publications

The role played by viscoelasticity in the bulk material during the propagation of a dynamic crack in elastomers

The role played by viscoelasticity in the bulk material during the propagation of a dynamic crack in elastomers

Non steady-state intersonic cracks in elastomer membranes under large static strain

Unraveling Non‐Uniform Strain‐Induced Crystallization Near a Crack Tip in Natural Rubber

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