X-ray tomographical observations of cracks and voids in 3D carbon/carbon composites

Sharma, Rajneesh; Deshpande, Vinit Vijay; Bhagat, Atul Ramesh; Mahajan, Puneet; Mittal, Ravi Kant

doi:10.1016/j.carbon.2013.04.046

Cited by 27 publications

(10 citation statements)

References 22 publications

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“…Traditionally, experimental measurement is the most commonly used method to investigate the effective mechanical properties of composites [9,10]. However, due to the timeconsuming and costly experimental tests [11], analytical calculation and numerical simulation are at least regarded as an alternative. To date, the analytical models have achieved much progress in investigating the mechanical behaviors of composites [12].…”

Section: Introductionmentioning

confidence: 99%

“…To obtain the accurate predictions of the effective mechanical properties of C/C composites with the reasonable computational efficiency, the microstructures of C/C composites should be characterized appropriately. Up to now, extensive techniques have been successfully used to obtain the microstructure of composites, such as scanning electron microscope (SEM) [21], micro CT [11] and Mercury Intrusion Porosimetry (MIP) [22,23]. Compared with the complex data obtained from micro CT test [24] and only 2D information got from SEM, MIP technique can provide both the distribution of the pore radius and the pore volume [25].…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites

Chao

Tian

et al. 2018

Composites Part B: Engineering

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Numerical simulation with progressive damage criterion is implemented to investigate the effect of porosity on the bending properties of 2D cross-ply carbon/carbon (C/C) composites. The mechanical properties of Pyrocarbon matrix regarding the change of porosity are calculated by using Mori-Tanaka approach. Combining with the stiffness degradation scheme, the ultimate bending strengths are calculated in Abaqus though a user-defined subroutine (USDFLD). Delamination is modelled by inserting cohesive elements between two adjacent plies. A good agreement is obtained when the FEM results are compared to three-point bending experiments. The FEM results show that the bending strength decreases greatly with the increase of porosity. When the porosity reaches up to 18%, the bending strength is decreased by 57%. The major fracture behaviors are interlamination delamination and continuous crack damage in 90˚ plies. With the increase of porosity, more severe interlamination delamination will be slightly aggravated. In addition, the increase of porosity will also accelerate the damage in 90˚ plies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites

Chao

Tian

et al. 2018

Composites Part B: Engineering

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“…Its main advantages include the non-destructive nature, multi-length scale resolutions and wide applicability to many solid materials [1]. Most of the existing XCT studies are restricted to the reconstruction of 3D internal microstructures of various materials [2][3][4][5][6] without loading. Recently, some in-situ XCT tests, by integrating a loading rig during the scan were carried out to investigate the internal 3D damage and fracture evolution in some materials, examples Limodin et al [7] in nodular graphite cast iron, Bay et al [8] in bones, Brault et al [9] in laminated composites, and Mostafavi et.…”

Section: Introductionmentioning

confidence: 99%

Micro-mechanisms of concrete failure under cyclic compression: X-ray tomographic in-situ observations

Sharma

Ren

McDonald

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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A meso scale compression test of the concrete specimen has been conducted in an in-situ X-ray computed tomography (XCT) facility. Concrete contained coarse aggregates of 5 mm and normal Portland cement. A specimen of 202020 mm 3 size was studied under three cycles in compression. It has been scanned after the completion of each stage in a cyclic (e.g. immediate after loading to the peak and after the unloading) and two dimensional (2D) images of the microstructure were recorded with a resolution of 16.5µm. A great amount of pre-existing damage in the form of micro cracks and voids has been revealed in the scanned images. Further, the micro-mechanisms, such as crack opening and closing, crack tip extension and diversion, crack tip blunting, and elastic recovery of the crack openings and closures were also observed in the images from different cycles. Finally, digital volume correlation (DVC) was utilized to get the macro displacement fields during each load cycle.

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“…Compared to SEM, X-ray computed tomography (XCT) is a nondestructive 3D technique capable of resolving internal structure with micron resolutions, and does not require tedious sample preparation. With XCT, void shape and size distributions, and interface structures can be revealed [9][10][11][12][13]. The synchrotron micro CT has been utilized to characterize the epoxy composites [10,12,13], 3D C/C [9] and 3D C/SiC [11].…”

Section: Introductionmentioning

confidence: 99%

Dynamic fracture of C/SiC composites under high strain-rate loading: microstructures and mechanisms

Fan

Lü

et al. 2015

Carbon

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We investigate dynamic fracture of C/SiC composites under high strain-rate compression or tension with split Hopkinson pressure bar (SHPB) and gas gun loading. Components of the as-fabricated composites are mapped and quantified with X-ray computed tomography, including C fibers and fiber bundles, SiC matrix, and inter-and intrabundle voids. Compression loading is applied along the out-of-and in-plane directions by SPHB at strain rates of 10 2 − 10 3 s −1 along with in situ X-ray phase contrast imaging. Out-of-plane direction compression and tension are examined with gas gun impact at strain rates 10 4 − 10 5 s −1. For the out-of-plane loading, compression induces fracture via void collapse and shear damage banding, while delamination dominates fracture for the in-plane direction compression. With increasing strain rates, the compression failure modes transit from interbundle to intrabundle fracture of SiC, and then to fiber and bundle breaking. Tensile failure involves delamina

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X-ray tomographical observations of cracks and voids in 3D carbon/carbon composites

Cited by 27 publications

References 22 publications

Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites

Numerical evaluation of the influence of porosity on bending properties of 2D carbon/carbon composites

Micro-mechanisms of concrete failure under cyclic compression: X-ray tomographic in-situ observations

Dynamic fracture of C/SiC composites under high strain-rate loading: microstructures and mechanisms

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