Numerical analysis of singly curved shallow composite panels under three-point bend load

Guedes, Rui Miranda; Sá, Alcides

doi:10.1016/j.compstruct.2007.04.005

Cited by 23 publications

(8 citation statements)

References 17 publications

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“…Inversion of curved beams under mechanical loading has been studied extensively in the literature. Curved beam deformation behavior due to bending moment has been modelled using analytical [50], finite element [51] and experimental [52] techniques. Owing to their unique geometry, these structures often undergo bifurcation buckling and snap-through instability when the translational and rotational degrees of freedom are constrained at their ends [53].…”

Section: Discussionmentioning

confidence: 99%

Mismatch strain programmed shape transformation of curved bilayer-flexible support assembly

Abdullah

Nan

Rogers

et al. 2016

Extreme Mechanics Letters

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Shape transformation in three dimensional (3D) structures is of interest in the design of engineered systems capable of accomplishing particular tasks that are unachievable by two dimensional (2D) architectures or static 3D ones. One approach involves the incorporation of stimuli responsive materials into the structural assembly to induce such transformations. In this work, we investigate the transformation of a curved bilayer ribbon supported by a flexible assembly that belongs to a family of complex three dimensional architectures. Through finite element analysis, we identified key design parameters and their effects on the deformation behavior of the assembly when it is subjected to an external stimuli in the form of a mismatch strain. Our results show that the behavior of the curved bilayer in response to the stimuli could be tuned by controlling the structural properties of the assembly. Our calculations also reveal a diverse set of deformation mechanisms including gradual flipping, snapping and creasing of the curved bilayer under specific circumstances. The design principles established in this work could be used to engineer 3D sensors, actuators for traditional and soft robotics, electronic device components, metamaterials, energy storage and harvesting devices with on-demand functional capabilities enabled by 3D transformations.

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Section: Discussionmentioning

confidence: 99%

Mismatch strain programmed shape transformation of curved bilayer-flexible support assembly

Abdullah

Nan

Rogers

et al. 2016

Extreme Mechanics Letters

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“…Accordingly, the average span for the 207 and 483 kPa specimen was 32.4 mm (0.81 mm thick) and 30.8 mm (0.77 mm thick), respectively. These half‐ring specimens were placed concave side down on support pins to reduce the effect of geometric nonlinearities . The cross‐head speed was set to 2 mm/min and the half‐ring segments were then loaded until an outer surface rupture occurred.…”

Section: Methodsmentioning

confidence: 99%

Reduction of microvoids in composite laminates fabricated by bladder assisted composite manufacturing (BACM)

Anderson

Altan

2014

Polymer Composites

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Bladder Assisted Composite Manufacturing (BACM) is a recently developed out-of-autoclave process designed to fabricate geometrically complex, hollow composite parts. This paper assesses the ability of three new BACM process variations to fabricate parts with high fiber and low void contents. This was achieved by fabricating 4-ply cylinders from a carbon/ epoxy prepreg at cure pressures of 207 and 483 kPa. The fiber/void content, mechanical properties, and energy consumed during the curing of the cylinders are investigated and compared to the original BACM process. The fiber content of the cylinders were observed to be dependent on both bladder pressure and BACM variation used, reaching a maximum fiber content of 66% which is 5% greater than that obtained by the original BACM process. The elastic moduli and failure strength results for the cylinders were found to increase with fiber content and showed no preference to any of the studied BACM process variations. In addition, the void content of the cylinders were reduced by 94% with the utilization of a porous bleeder fabric when compared to the original BACM process. POLYM. COMPOS., 37:561-572, 2016.

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“…[14]. The support span for all tests was set such that a 16:1 or greater span to depth ratio was maintained and the specimens were placed with the concave side down to reduce the effect of geometric nonlinearities [15]. Twelve ring segment specimens from each of the pressure/ply combinations were tested.…”

Section: Mechanical Testingmentioning

confidence: 99%

Properties of Composite Cylinders Fabricated by Bladder Assisted Composite Manufacturing

Anderson¹,

Altan

2012

Journal of Engineering Materials and Technology

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An innovative manufacturing method, bladder assisted composite manufacturing (BACM), to fabricate geometrically complex, hollow parts made of polymeric composite materials is presented. Unlike the conventional bladder or diaphragm assisted curing processes, BACM uses an internally heated bladder to provide the consolidation pressure at the required cure temperature. The feasibility of this manufacturing method is demonstrated by fabricating laminated composite cylinders using multiple cure pressures and number of plies. The elastic moduli, failure strength, fiber volume fraction, and void contents of the cylinders were found to be comparable to the values obtained fi-om fiat laminates produced by hot plate molding of the same material. Compared to conventional bladder manufacturing methods, the BACM process reduced the energy required to cure the cylinders by almost 50% due to internal heating and insulatedmold.

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Numerical analysis of singly curved shallow composite panels under three-point bend load

Cited by 23 publications

References 17 publications

Mismatch strain programmed shape transformation of curved bilayer-flexible support assembly

Mismatch strain programmed shape transformation of curved bilayer-flexible support assembly

Reduction of microvoids in composite laminates fabricated by bladder assisted composite manufacturing (BACM)

Properties of Composite Cylinders Fabricated by Bladder Assisted Composite Manufacturing

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