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Sökning: WFRF:(Spearing R)

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  • Sisodia, Sanjay M., et al. (författare)
  • High-resolution computed tomography in resin infused woven carbon fibre composites with voids
  • 2016
  • Ingår i: Composites Science And Technology. - 0266-3538 .- 1879-1050. ; 131, s. 12-21
  • Tidskriftsartikel (refereegranskat)abstract
    • Tomographic imaging using both microfocus radiation and synchrotron radiation was performed to assess the void defects in resin transfer moulded woven carbon fibre composites. The focus of this study is on characterising the void homology (e.g. local void size and spatial distribution) in relation to weave orientation, infusion direction and potential effects on damage formation in tensile loading. As the orientation angle between the fibre direction of unidirectional layer in the laminate and the direction of the global resin flow increases, from parallel to perpendicular, larger voids and a greater volume fraction of voids were observed, which led to increased damage formation upon loading. Significant accumulation of voids around both the layer interfaces and yarn fibres were also observed. With regard to yarn design, it is recommended to balance the benefits (e.g. fabric handling, structural integrity of preform) and drawbacks (e.g. lower fibre content, more voids) of the supporting yarn. Also, sensible placement of resin inlets and outlets could reduce the amount of deleterious voids, i.e. by promoting resin flow along the fibre direction in the most defect-sensitive off-axis layers.
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  • Sisodia, Sanjay, et al. (författare)
  • The effects of voids in quasi-static indentation of resin-infused reinforced polymers
  • 2019
  • Ingår i: Journal of composite materials. - 0021-9983 .- 1530-793X. ; 53:28-30, s. 4399-4410
  • Tidskriftsartikel (refereegranskat)abstract
    • The focus of this study is the influence of voids on the damage behaviour in quasi-static loading of resin-infused carbon fibre-reinforced polymers. Experimental results are presented for quasi-static loading in combination with high-resolution tomographic imaging and statistical analysis (homology of pores or voids and induced cracks). Three distinct mechanisms were observed to control delamination growth in the presence of sharp and blunt voids. Delamination cracks interact with the supporting yarns, especially in combination with air pockets trapped in the resin in the form of long, sharp voids. This resulted in crack growth that coalesces with delamination cracks from neighbouring yarn-voids during increased out-of-plane load-displacement, with almost no presence of intralaminar transverse cracks. This highlights the benefits and drawbacks of the supporting yarn during out-of-plane loading.
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