<i>J</i>‐Integral from Full Field Kinematic Data for Natural Rubber Compounds

Caimmi, Francesco; Calabrò, Roberto; Briatico‐Vangosa, Francesco; Marano, Claudia; Rink, M.

doi:10.1111/str.12145

Cited by 15 publications

(5 citation statements)

References 50 publications

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“…There have been very few attempts for elastomers (large strain). Nonetheless Caimmi et al (2015) have used DIC to compute the J-integral around a static crack in a rubber sheet, and Livne et al (2010) have measured it around a rapid crack (2 m.s −1 ) in a brittle elastomer under moderate strain level. Using our full-field measurements technique, we now question the possibility to measure the energy release rate in a very general case which combines large strain, non-linear elasticity, and high speed crack growth at non-constant speed.…”

Section: Measuring the Dynamic Energy Release Ratementioning

confidence: 99%

“…Indeed, with the plane stress assumption and the incompressibility of elastomers, the out-of-plane strain can be directly computed from 2D strain fields measured on the surface. Improvements in the DIC technique have extended its applicability to large strain (Chevalier et al, 2001), in particular for strain fields around static cracks in rubber (Rublon et al, 2014;Caimmi et al, 2015;Qi et al, 2019). For moving cracks, many optical techniques have been developed for fragile materials, from photoelasticimetry (Dally, 1979) or caustics (Washabaugh and Knauss, 1994) to DIC with high frequency cameras (Chao et al, 1998;Kirugulige and Tippur, 2009) for linear elastic fracture mechanics.…”

Section: Introductionmentioning

confidence: 99%

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Experimental full field analysis for dynamic fracture of elastomer membranes

et al. 2020

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Crack speed prediction in elastomer membranes under large strain (more than 150 %) remains a delicate question which necessitates coupled experimental-theoretical investigations. In order to compare experimental results with theoretical approaches but also to improve the understanding of dynamic crack propagation in soft materials, a crucial step is the measurement and analysis of kinematic and energetic fields in the material configuration during dynamic fracture. In this way, the proposed set-up consists in a two-camera set-up in order to perform digital image correlation during both quasi-static loading and dynamic fracture of the sample. The variety of kinematic and energetic fields that can be computed is illustrated. Finally, two studies highlighting the promises of full-field measurements in large strain fracture mechanics are presented: the computation of the dynamic J -integral and the observation of mechanical waves during high speed crack growth in elastomer membranes.

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Section: Measuring the Dynamic Energy Release Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental full field analysis for dynamic fracture of elastomer membranes

et al. 2020

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“…Many works related to the calculation of tearing energy using single edge notched tensile (SENT) specimens are reported in the literature [ 9 , 10 , 11 , 12 , 13 ]. Researchers have tried to precisely calculate the energy release rate by using the J-integral [ 9 , 10 , 11 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Configuration of Novel Experimental Fractographic Reverse Engineering Approach Based on Relationship between Spectroscopy of Ruptured Surface and Fracture Behaviour of Rubber Sample

et al. 2020

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A novel fractographic approach based on a combination of (i) mechanical behavior of cured rubber in uniaxial tensile loading and (ii) spectroscopy of fracture on a ruptured surface was experimentally validated. This approach related the migration of paraffin oil from a matrix to the ruptured rubber surface, to the tearing energy related to the deformation speed responsible for total rubber sample rupture, and the approach itself was configured experimentally. It was evaluated on cured natural rubber (NR) for two different paraffin oil concentrations. Single edge notched tensile (SENT) samples were subjected to uniaxial tensile loadings at two different deformation speeds. First, the tearing energy as a function of deformation speed was determined for each defined oil concentration. Secondly, at specific locations on the ruptured surfaces, infrared (IR) spectroscopy was performed to quantify a characteristic absorbance peak height of migrated paraffin oil during the rupture process. The results of the IR analyses were related to the deformation speed to understand the relation between the amount of migrated paraffin oil during the fracture process and the deformation speed which brought about such a fracture. This novel approach enhanced the reverse engineering process of rubber fracture related to the cause of tearing energies during critical failure.

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“…One solution to this problem has been proposed by Molteno [50] who used linear interpolation in the crack tip and crack flank region, whilst Yoneyama [51] proposed a finite element method to smooth the measured DIC displacement field using the measured boundary conditions; smoothing algorithms that are not based on FE approaches have also been used [52]. Full-field measurements of the boundary conditions as inputs to FE have previously been used to calculate strain and stress fields; for instance, one of the first applications was in 1990 when Morton et al [53,54] uses FE to extract stresses from moiré interferometry measurements of the crack displacement field, and more recently, Caimmi [55] made use of FE to compute the stresses from DIC-measured strains, using a hyperplastic material model.…”

Section: Introductionmentioning

confidence: 99%

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

et al. 2017

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A novel method has been developed based on the conjoint use of digital image correlation to measure full field displacements and finite element simulations to extract the strain energy release rate of surface cracks. In this approach, a finite element model with imported full-field displacements measured by DIC is solved and the J-integral is calculated, without knowledge of the specimen geometry and applied loads. This can be done even in a specimen that develops crack tip plasticity, if the elastic and yield behaviour of the material are known. The application of the method is demonstrated in an analysis of a fatigue crack, introduced to an aluminium alloy compact tension specimen (Al 2024, T351 heat condition).

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J‐Integral from Full Field Kinematic Data for Natural Rubber Compounds

Cited by 15 publications

References 50 publications

Experimental full field analysis for dynamic fracture of elastomer membranes

Experimental full field analysis for dynamic fracture of elastomer membranes

Configuration of Novel Experimental Fractographic Reverse Engineering Approach Based on Relationship between Spectroscopy of Ruptured Surface and Fracture Behaviour of Rubber Sample

J-Integral Calculation by Finite Element Processing of Measured Full-Field Surface Displacements

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