Wedge Splitting Test on Douglas genotypes using an integrated mixed-mode approach

Jamaaoui, Amine; Pop, Octavian; Dubois, Frédéric; Costa, Guy

doi:10.1016/j.tafmec.2017.03.012

Cited by 10 publications

(8 citation statements)

References 34 publications

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“…The analysis of the analytical equations allowing calculation the SIF shows that its estimation depends on sample geometry and the loading amplitude. Based on the displacement fields amplitude the CRDF can be related with the kinematic state near the crack tip [19,20,25]. In this case, the CRDF can be calculated from the displacement fields measured by optical metrologies [19,20,25].…”

Section: Crack Relative Displacement Factor Estimation By Digital Imamentioning

confidence: 99%

“…Based on the displacement fields amplitude the CRDF can be related with the kinematic state near the crack tip [19,20,25]. In this case, the CRDF can be calculated from the displacement fields measured by optical metrologies [19,20,25]. In the present paper, we propose to use the Digital Image Correlation (DIC) in order to measure the displacement fields and to evaluate the CRDF.…”

Section: Crack Relative Displacement Factor Estimation By Digital Imamentioning

confidence: 99%

“…As detailed in works of [19,20,25,52], the CRDF is calculated from the experimental displacement field via an adjustment procedure based on an iterative Newton-Raphson algorithm (see Fig. 7).…”

Section: Evaluation Of Crack Relative Displacement Factormentioning

confidence: 99%

“…It is also interesting to observe that the relationship between the CRDF corresponding to mode I and II, and the relationship to the SIF show some similarities. Pop et al [19,20] and Meite et al [25,52] show also that the energy may be estimated from the CRDF and SIF values, Eq.…”

Section: Evaluation Of Crack Relative Displacement Factormentioning

confidence: 99%

“…As will be shown latter the CRDF allows definition of the kinematic state around to the crack tip. As defined by Dubois et al [17,18], Pop et al [19] and Jamaaoui et al [25], the crack opening state represents the relative displacement between two points positioned on the upper and the lower crack flanks. Its evaluation can be performed directly from the experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

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Mechanical and fracture properties of particleboard

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Particleboard (PB) are wood-based composites with fine wood fibers bound together by a small amount of polymeric adhesive, widely used in furniture industry and civil engineering. PB plates can be painted, laminated or veneered, and have good dimensional stability and load bearing capacity when properly designed. However, the deformation and fracture of such elements create malfunctions of structures made of MDF. This paper presents experimental results obtained for three point bending (TPB) tests, mode I and mode II fracture toughness. The bending tests were carried on rectangular specimens, while the fracture toughness tests were performed on Single Edge Notched Bend (SENB) specimens for mode I, respectively on Compact Shear (CS) specimens for mode II loadings. Digital Image Correlation technique allows the determination of the Crack Relative Displacement Factor and estimation of the Energy Release Rate.

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Section: Crack Relative Displacement Factor Estimation By Digital Imamentioning

confidence: 99%

Section: Crack Relative Displacement Factor Estimation By Digital Imamentioning

confidence: 99%

Section: Evaluation Of Crack Relative Displacement Factormentioning

confidence: 99%

Section: Evaluation Of Crack Relative Displacement Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Mechanical and fracture properties of particleboard

Marșavina

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Tensile Fracture Initiation and Propagation of Granite and Gneiss at Wedge Splitting Tests: Part 2—Fracturing Studies Based on Digital Image Correlation and Thin Section Analysis

Jacobsson,

Brander

2024

Rock Mech Rock Eng

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The crack development in quasi-brittle granite and brittle gneiss under mode I loading condition was monitored using digital image correlation (DIC) technique during wedge splitting tests. The cracking behavior was studied on granite specimens that were split in one material direction, perpendicular to the rift plane, and gneiss specimens that were split in three different material directions, parallel and perpendicular to the foliation (along and across a lineation). The granite specimens had a saw cut 5 mm-wide notch and a blunt round notch in form of a 32 mm borehole. The gneiss specimens had a saw cut notch. The results from the DIC measurements revealed a meandering and branching crack path for the granite, whereas a smoother crack path for the gneiss with almost no branching. This behavior was confirmed by microscopy images from thin sections taken from specimens after testing. The thin sections showed that the fractures were prone to propagate across grains in the more coarse-grained granite than in the fine-grained gneiss, where the fractures propagated almost entirely along grain boundaries. The crack initiation occurred mainly in the corner of the saw cut notches and centrally in the round notch. However, the initiation locations in the granite were affected by the medium- to coarse-grained microstructure with grains preventing initiation and propagation which yielded displaced positions out from the ideal ones with respect to the highest stress in some cases. The crack opening displacement was determined along the crack path from the DIC measurements at 12 stages on each specimen of the advancing crack during the splitting progress. The critical crack opening displacement and length of the fracture process zone were assessed and the crack front position yielding the crack length along the tests was determined. The results showed a critical crack length when the deformations in the ligament (also called plastic hinge) affected the cracking process. The average crack velocity in gneiss during the test was more than twice as high as in the granite. This is attributed to a combined effect of the higher brittleness in the gneiss and the effect of a too large elastic energy in the specimen and test setup in relation to the dissipated fracture energy which made the initial crack propagation in the gneiss specimens nearly unstable. The strain energy release rate was calculated along the crack propagation and showed a lower value when the crack lengths were less than 40–60 mm. The calculation of the strain energy release rate was made on crack length measurements from DIC results. The results from the investigation were discussed in relation to the few other similar results found in the literature. The findings give an insight and understanding of the cracking process via both qualitative and quantitative results. Several used methods were novel or not used together in a single study as in this one.

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Wedge splitting test of wood for fracture parameters estimation of Norway Spruce

Ostapska¹,

Malo²

2020

Engineering Fracture Mechanics

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Wedge Splitting Test on Douglas genotypes using an integrated mixed-mode approach

Cited by 10 publications

References 34 publications

Mechanical and fracture properties of particleboard

Mechanical and fracture properties of particleboard

Tensile Fracture Initiation and Propagation of Granite and Gneiss at Wedge Splitting Tests: Part 2—Fracturing Studies Based on Digital Image Correlation and Thin Section Analysis

Wedge splitting test of wood for fracture parameters estimation of Norway Spruce

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