The bending stiffness of laminated composite material I-beams

Craddock, James N.; Yen, She-Hwa

doi:10.1016/0961-9526(93)90018-f

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…Sophisticated analyses coupled with numerical computations exist [1][2][3][4][5] in addition to the structural design procedure [6]. Structural analysis [7] was also carried out on the basis of the lamination theory in conjunction with the mechanics of materials. Although they were successful in their own applications, all these analyses used a simpli ed crosssectional pro le.…”

Section: Introductionmentioning

confidence: 99%

“…Structural analysis [7] was also carried out on the basis of the lamination theory in conjunction with the mechanics of materials. Although they were successful in their own applications, all these analyses used a simpli ed crosssectional pro le.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, to gain a thorough understanding of the load-bearing nature of I-beams, it is necessary to conduct an experimental examination of the failure characteristics induced under exural or shear loading as reviewed in references [8] to [12]. Composite I-beams are usually made in the form of solid structures, as shown in previous studies [1][2][3][4][5][6][7][8][9][10][11]. However, an even further weight reduction and thus a greater structural ef ciency could be achieved by using a sandwich construction in the web section, such as the main wing spars of the T67 Fire y light aircraft.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of preconditioned glass fibre reinforced composite sandwich I-beams in bending

Zhou

Forbes²,

Foster³

2002

Proceedings of the Institution of Mechanical Engineers, Part L:

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The exural mechanical behaviour of various composite sandwich I-beams has been investigated under quasi-static loading. Both intact and preconditioned I-beam specimens were examined. The intact I-beams had two different support spans. The preconditions included central voids and remote debonds, both embedded at the ange-web intersections, whereas remote, barely visible impact damage (BVID) was introduced on the ange surfaces. It was found that the behaviour of the present I-beams was nearly linear until ultimate failure approached, and that the load-bearing capability exceeded the design requirement, irrespective of the preconditions. The exural rigidity of the intact I-beams calculated by using the lamination theory compared well with the experimental value. The analytical predictions for maximum de ections and maximum tensile strains were in reasonably good agreement with the respective experimental measurements. It was found that neither the central voids nor the remote debonds or BVID had a signi cant effect on the exural behaviour. The process of structural failure was extremely complex and was affected to a greater extent by the relatively low mechanical properties of the polymethacrylimide (PMC) foam core. It was shown that foam compression and local web skin wrinkling were the major failure mechanisms, irrespective of the preconditions.

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