Local strain in a 5-harness satin weave composite under static tension: Part I – Experimental analysis

Daggumati, Subbareddy; Voet, Eli; Paepegem, Wim Van; Degrieck, Joris; Xu, Jian; Lomov, Stepan Vladimirovitch; Verpoest, Ignace

doi:10.1016/j.compscitech.2011.03.021

Cited by 59 publications

(39 citation statements)

References 27 publications

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“…Two recent studies [14,15] have incorporated DIC to examine the mechanical behavior of a 2-D C-fiber polymer matrix composite. They confirm the expected features: notably, the heterogeneity of strains at intra-tow and inter-tow length scales as well as the periodicity of strains and its intimate relationship to the fiber architecture.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Digital Image Correlation for High-Resolution Strain Mapping of Ceramic Composites

2012

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Digital image correlation (DIC) is assessed as a tool for measuring strains with high spatial resolution in woven-fiber ceramic matrix composites. Using results of mechanical tests on aluminum alloy specimens in various geometric configurations, guidelines are provided for selecting DIC test parameters to maximize the extent of correlation and to minimize errors in displacements and strains. The latter error is shown to be exacerbated by the presence of strain gradients. In a case study, the resulting guidelines are applied to the measurement of strain fields in a SiC/SiC composite comprising 2-D woven fiber. Sub-fiber tow resolution of strain and low strain error are achieved. The fiber weave architecture is seen to exert a significant influence over strain heterogeneity within the composite. Moreover, strain concentrations at tow crossovers lead to the formation of macroscopic cracks in adjacent longitudinal tows. Such cracks initially grow stably, subject to increasing app lied stress, but ultimately lead to composite rupture. Once cracking is evident, the composite response is couched in terms of displacements, since the computed strains lack physical meaning in the vicinity of cracks. DIC is used to identify the locations of these cracks (via displacement discontinuities) and to measure the crack opening displacement profiles as a function of applied stress.

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Section: Introductionmentioning

confidence: 99%

Optimization of Digital Image Correlation for High-Resolution Strain Mapping of Ceramic Composites

2012

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“…The full model calculations are reported in [47,48]. We have used the ABAQUS models kindly provided by the authors of [47,48] to benchmark the new EE calculations. The reader is referred to the original papers for details of building the full models.…”

Section: From a Geometrical Model To Finite Element Analysis *mentioning

confidence: 99%

From a Virtual Textile to a Virtual Woven Composite

Lomov¹

2015

Woven Composites

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The future of fibre-reinforced composites, in general, and textile composites in particular, seems bright. Four industrial branches -aeronautic, automotive, sporting goods and wind energy -are now major users of composites, and their demands will shape composite material science for decades ahead.With the Airbus-380, Airbus-350 and Boeing-787 flying, and being produced by the hundreds, the aeronautics industry has a high demand for further materials, manufacturing and quality control improvement. All leading car manufacturers have developed concept solutions of composite cars, with several of them already on the roads or expected there shortly. The specific price requirements and recyclability regulations of the car industry shape the research directions in somewhat different ways than in aeronautics. The demands of wind energy industry for composites are extreme, both in production volumes and in material performance. Turbine blades of 90 metres, composed fully of composite materials need to run for 25 years in extreme, off-shore conditions at the same time, meeting the competitive cost limits of the energy market. And finally, the sporting goods industry has become almost a "traditional" user of composites, both because they allow for weight reduction and hence reduce the energy consumption by the athletes (in cycling . . . ) and they improve the control and efficiency (in skiing, tennis . . . ). Sporting goods have always been, and will remain, an ideal testing ground for new composites concepts, because the consumer demands them and the developers are not hindered by too many regulations. 109Woven Composites Downloaded from www.worldscientific.com by UNIVERSITY OF BIRMINGHAM on 08/21/15. For personal use only.

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“…Intra-ply delamination in weft tow in CFRP laminate composite specimens. This technique was also employed in [14] for damage characterisation of woven CFRP laminates. In this work, an OLYMPUS BX-60M microscope was used to capture the images of the through-thickness side edge of the un-fractured specimen to observe the barely visible damage on the specimen surface.…”

Section: Microscopic Analysis Of Woven Cfrpmentioning

confidence: 99%