Variable-stiffness composite panels: As-manufactured modeling and its influence on the failure behavior

Falcó, O.; Mayugo, J.A.; Lopes, C.S.; Gascons, N.; Turón, A.; Costa, J.

doi:10.1016/j.compositesb.2013.09.003

Cited by 58 publications

(23 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The percentage of feasible designs increased to 27%, 37%, and 32% for the second, third and fourth plate sizes considered in this work, respectively. In practice, for a very small T 1 , the course width at the plate edges becomes too small, and AFP has to drop all the tows within the course before reaching the plate edges [12,16]. Hence for a constant curvature fiber path, laminates with a very small T 1 are not manufacturable, regardless of the plate size.…”

Section: Manufacturable Design Spacementioning

confidence: 99%

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

Nik

Lessard

Pasini

2015

Science and Engineering of Composite Materials

View full text Add to dashboard Cite

Variable stiffness laminates can be manufactured using curvilinear fiber paths. A curvilinear fiber path is generally defined based on the plate size and has a curvature that is dependent on the plate size. In practice, however, the fiber path must satisfy manufacturing constraints, such as the minimum turning radius imposed by the automated fiber placement machine, thereby limiting the possible amount of fiber steering. In this work, we studied the effect of the plate size on the structural properties of a plate manufactured with curvilinear fibers. We considered four plate sizes, which were designed by a constant curvature fiber path. We optimized the plates for both maximum buckling load and in-plane stiffness. The results showed that the in-plane stiffness of the plate was not controlled by the plate size, whereas the buckling load was highly affected by the curvature of the fiber path. Hence, the potential of a buckling load increase reduced for plate sizes smaller than the minimum turning radius. In addition, for a given maximum curvature of the fiber path, the influence of a complex layup on the buckling load was marginal.

show abstract

Section: Manufacturable Design Spacementioning

confidence: 99%

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

Nik

Lessard

Pasini

2015

Science and Engineering of Composite Materials

View full text Add to dashboard Cite

show abstract

“…The recent advances in manufacturing technologies have made it possible to produce VSCL components. There are multiple ways by which the variable angle composites can be manufactured and has been well detailed [8,9,10]. Usually the fiber orientations are described as a function of the spatial coordinate.…”

Section: Introductionmentioning

confidence: 99%

Mechanical buckling of curvilinear fibre composite laminate with material discontinuities and environmental effects

Venkatachari

Natarajan

Ganapathi

et al. 2015

Composite Structures

View full text Add to dashboard Cite

“…• is never achieved in practice due to finite tow-width and discrete tow-cutting [25]. For the tensile specimen design in this work, a discontinuity of 12…”

Section: Specimen Design and Manufacturingmentioning

confidence: 99%

“…on buckling response, thermal stresses analyses, strength and stiffness-with the aim of obtaining an adequate understanding of the behavior of these laminates have been developed and validated by experimental work [18][19][20][21][22][23][24]. However, the full details of the mechanisms that lead to failure and the mechanical response of a VSP are not yet fully understood, particularly the influence of embedded defects, mainly gaps, overlaps and the fiber angle discontinuities induced by AFP [25,26]. It is worth mentioning the theoretical and numerical investigation on the influence of the tow-drop areas and staggering on the stiffness and strength of variable-stiffness laminates presented by Blom et al [12].…”

mentioning

confidence: 99%

Variable-stiffness composite panels: Defect tolerance under in-plane tensile loading

Falcó

Mayugo

Lopes

et al. 2014

Composites Part A: Applied Science and Manufacturing

Self Cite

View full text Add to dashboard Cite

Automated Fiber Placement is being extensively used in the production of major composite components for the aircraft industry. This technology enables the production of tow-steered panels, which have been proven to greatly improve the structural efficiency of composites by means of in-plane stiffness variation and load redistribution. However, traditional straightfiber architectures are still preferred. One of the reasons behind this is related to the uncertainties, as a result of process-induced defects, in the mechanical performance of the laminates. This experimental work investigates the effect of the fibre angle discontinuities between different tow courses in a ply on the un-notched and open-hole tensile strength of the laminate. The influence of several manufacturing parameters are studied in detail. The results reveal that 'ply staggering' and '0% gap coverage' are effective techniques in reducing the influence of defects in these laminates.

show abstract

Variable-stiffness composite panels: As-manufactured modeling and its influence on the failure behavior

Cited by 58 publications

References 17 publications

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

Size-dependent behavior of laminates with curvilinear fibers made by automated fiber placement

Mechanical buckling of curvilinear fibre composite laminate with material discontinuities and environmental effects

Variable-stiffness composite panels: Defect tolerance under in-plane tensile loading

Contact Info

Product

Resources

About