Mixed mode fracture properties characterization for wood by Digital Images Correlation and Finite Element Method coupling

Méïté, Mamadou; Dubois, Frédéric; Pop, Octavian; Absi, Joseph

doi:10.1016/j.engfracmech.2013.01.008

Cited by 42 publications

(9 citation statements)

References 19 publications

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“…The cohesive laws are especially important as input data in the numerical modeling of composite materials and structures. Méité et al (2013) employed an optimization technique within a combination of finite element (FE) simulation and digital image correlation (DIC) analysis to characterize the fracture behavior of Douglas fir (Pseudotsuga Menziesii (Mirb. ), Franco) in a mixed mode.…”

Section: Introductionmentioning

confidence: 99%

“…Both tools conveniently provided data that enabled the separation of mode I and mode II without considering the local elastic mechanical properties. Jamaaou et al (2017) used a similar approach as Méité et al (2013) to investigate the influence of mixing modes on the total fracture properties of Douglas fir (P. menziesii L.) loaded perpendicular (⊥) to the fiber in mode I within the wedge-splitting test (WST).…”

Section: Introductionmentioning

confidence: 99%

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Thermally modified (TM) beech wood: compression properties, fracture toughness and cohesive law in mode II obtained from the three-point end-notched flexure (3ENF) test

et al. 2019

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The fracture properties of thermally modified beech (Fagus sylvatica) wood (TMW) at 180° and 200°C were evaluated in mode II using the three-point end-notched flexure (3ENF) scheme assisted by three-dimensional (3D) stereovision equipment for obtaining displacements and strains. The compliance-based beam method (CBBM) provided the strain energy release rates (GII) of TMW and cohesive laws for both native wood (W) and TMW. Based on the CBBM and equivalent crack length approach (ECLA),GIIwas obtained directly from the force-deflection data. The thermal modification (TM) process reduced the compressive strength by 4.4% and increased the compressive elastic modulus by 38.3%, whereasGIIwas reduced substantially by 40.8% and 67.9% at TM180°Cand TM200°C, respectively. TM also increased wood brittleness that was visible on the displacement slip reduction. The resulting mean cohesive models can be used for numerical analyses. The fracture properties of TMW have to be taken into consideration for constructional wood application, when cyclic loading may lead to microcracking and material fatigue.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermally modified (TM) beech wood: compression properties, fracture toughness and cohesive law in mode II obtained from the three-point end-notched flexure (3ENF) test

et al. 2019

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“…Various contactless imaging techniques have already been used to characterize the behavior of wood. Some authors, such as Pop et al (2011), Méité et al (2013), Xavier et al (2014), Silva et al (2014), used digital image correlation (DIC) to characterize wood cracking parameters. Recently, Gauvin et al (2014) performed longitudinal adsorption tests on populus specimens with a thickness of between 6 and 10 mm using DIC.…”

Section: Introductionmentioning

confidence: 99%

Investigating wood under thermo-hydromechanical loading at the ring scale using full-field measurements

2018

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The thermo-visco-hydro-mechanical (TVHM) loading of Abies Alba Mills (white fir of Massif Central) is investigated in this paper. A full-field measurement technique, namely the grid method, is used in the experiments in order to observe heterogeneities and to measure strain fields in the annual growth rings. This enables the investigation of the effects of moisture content changes on the strain of latewood and earlywood during creep and recovery. The tested specimens are first conditioned to a given moisture content. Each of them is then subjected to a compression test and regularly removed in order to measure the moisture content. A positioning system is developed to ensure the consistent location of each specimen with respect to the camera. Before loading, images are taken using a CCD camera to highlight the impact of moisture conditioning. Images are also acquired during the loading steps, and between each recovery step after complete unloading. All the strain maps are determined with respect to a reference image taken either before the water conditioning of the specimen or before loading. During the experiments, strain gradients clearly appear between latewood and earlywood, highlighting the variability of the mechanical properties at the ring scale. The effect of moisture content changes on the mechanical behavior of wood at the ring scale is evidenced and discerned.

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“…Annual rings behave as channels for crack propagation and thus make crack paths more regular and predictable. The measurement technique used here (the grid method) does not feature a higher measurement error than similar techniques used to measure displacement and strain fields on wood specimens, such as DIC [28,31].…”

Section: Critical Energy Release Ratementioning

confidence: 99%

“…In mechanics, proposing the appropriate model in order to track the crack tip and to measure the crack opening generally relies on specific tests for which suitable models and measuring methods are available. Full-field measurement techniques such as Digital Image Correlation (DIC) have been used for this purpose in several cases [24,25,26,27,28,29]. Belrhiti et al dealt with the refinement of the digital image correlation technique to study the fracture behavior of refractory materials [30].…”

Section: Introductionmentioning

confidence: 99%

Mode I fracture of tropical woods using grid method

Odounga

Pitti

Toussaint

et al. 2018

Theoretical and Applied Fracture Mechanics

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The cracking properties in opening mode of three tropicals species from the Gabonese forest, namely Iroko (Milicia Excelsa), Okume (Aucoumea klaineana Pierre), and Padouk (Pterocarpus soyauxii), were investigated in this study. Various tests were performed at room temperature and for two different thicknesses. A full-field measurement technique, namely the grid method, was used in order to obtain the displacement and strain maps near the crack during the tests. The mechanical parameters, the specificities of the wood species, the Arcan system and the grid transfer method are first described. For all the specimens, the initial crack length was oriented along the fiber direction (RL). The instantaneous failure tests were performed using two types of specimens: the modified Compact Tension Shear (CTS) and the Mixed Mode Crack Growth (MMCG) specimens. The images of the grid were recorded and analyzed to obtain the displacement maps. The crack opening, the location of the crack tip as well as the strain fields on the surface of the specimens were deduced from these displacement maps. The experimental critical energy release rate Gc was evaluated by the compliance method in imposed displacement. In the case of instantaneous crack with CTS specimens, the comparison of the initial value of Gc for all the samples show that this quantity strongly depends on the thickness and density of the species under study. Crack propagation was observed for a thickness equal to 20 mm only. The results of the crack propagation with the MMCG specimens show the same dependence, and confirm the quasi-brittle fracture behavior of Iroko. The experimental results are scattered, but clear trends can be observed concerning the fracture parameters of the in previous studies described in the literature on wood species with wood species under study. The results are finally compared with those given densities similar to those studied here.

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Mixed mode fracture properties characterization for wood by Digital Images Correlation and Finite Element Method coupling

Cited by 42 publications

References 19 publications

Thermally modified (TM) beech wood: compression properties, fracture toughness and cohesive law in mode II obtained from the three-point end-notched flexure (3ENF) test

Thermally modified (TM) beech wood: compression properties, fracture toughness and cohesive law in mode II obtained from the three-point end-notched flexure (3ENF) test

Investigating wood under thermo-hydromechanical loading at the ring scale using full-field measurements

Mode I fracture of tropical woods using grid method

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