A rational method for obtaining the dynamic mechanical properties of laminae for predicting the stiffness and damping of laminated plates and beams

A new and accurate relationship for the shear modulus in the fiber direction of unidirectional fiber composites is derived, based on the Kerner model concepts but not using its approximate relationships. Furthermore, this model is extended by taking into account the mesophase between the fiber and the matrix accomodating smoothly the mechanical properties between neighbouring phases. The introduction of the mesophase results in an improvement of the theoretical predictions, which now approach close to experimental values for the moduli of different fibrous composites.

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“…Expressions similar to relations (12), containing the remaining stresses and strains, are redundant and do not provide any further information.…”

Section: A C = Af Vf-[-ai Vi + Am U M = Glrc"mentioning

confidence: 97%

“…The properties and the volume content of the mesophase, were calculated in [7] from experimental data, presented in [11][12] for an E-glass epoxy resin unidirectional fiber composite. These results are given in table 1.…”

Section: Applicationsmentioning

confidence: 99%

The shear modulus in the fiber direction of unidirectional fiber composites based on the concept of mesophase

Theocaris

Varias

1987

Rheol Acta

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“…Chung has indicated that increasing the matrix/fiber volume ratio will increase the damping ratio [2]. Ni and Adams reported that a parabolic increase in damping was observed in carbon fiber reinforced polymeric composites (CFRP) and glass fiber reinforced polymeric composites (GFRP) at up to 0.6 volume ratio [3].…”

Section: Related Workmentioning

confidence: 99%

Effect of Orientation Angles on Vibration Properties at Carbon Fiber Reinforced Polymeric Composites

Aydın¹,

Gündoğdu²,

Kaya³

et al. 2018

NWSA

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In this study, composite plates with dimensions of 300x300mm were produced by VARTM (Vacuum Assisted Resin Transfer Molding) method using unidirectional carbon fiber fabrics. The composite plates were produced symmetrically at four different orientations ((0°) 4 ,(60°/-30°) S ,(45°/-45°) S , (0°/90°) S ) and four layered. Required specimens according to three-point bending and vibration tests related ASTM standards for were cut from produced plates. The maximum flexural stresses of the specimens were determined by performing three-point bending tests. Free vibration tests under fixed-free boundary conditions were performed to determine their natural frequencies and damping ratios. As a result of the tests, specimens with (0°) 4 directional angles were found to have the highest bending strength. Also, composite specimens with orientation angles (0°) 4 have the highest natural frequencies and lowest damping ratios. (45°, -45°) S , the natural frequency values were the lowest while the damping ratio values were found to be the highest.

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“…(7,10) matrix layer, which have shown to be a significant additional source of damping in composite laminates [14]. Similarly, the maximum laminate strain energy in eq.…”

Section: Laminate Dampingmentioning

confidence: 99%

“…Various damping mechanics theories for unidirectional composites and laminates [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have been reported. Work on the damping of composite beams and plates [15][16], and plate/shell composite structures of general geometry and lamination has been also reported [17].…”

Section: Introductionmentioning

confidence: 99%

Integrated Mechanics for the Passive Damping of Polymer-Matrix Composites and Composite Structures

Saravanos

Chamis

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Some recent developments on integrated damping mechanics for unidirectional composites, laminates, and composite structures are reviewed. Simplified damping micromechanics relate the damping of on-axis and off-axis composites to constituent properties, fiber volume ratio, fiber orientation, temperature, and moisture. Laminate and structural damping mechanics for thin composites are summarized. Discrete layer damping mechanics for thick laminates, including the effects of interlaminar shear damping, are developed and semi-analytical predictions of modal damping in thick simply-supported specialty composite plates are presented. Applications demonstrate the advantages of the unified mechanics, and illustrate the effect of fiber volume ratio, fiber orientation, structural geometry, and temperature on the damping. Additional damping predictions for composite plates of various laminations, aspect ratios, fiber content, and temperature illustrate the merits and ranges of applicability of each theory (thin or thick laminates).

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A rational method for obtaining the dynamic mechanical properties of laminae for predicting the stiffness and damping of laminated plates and beams

Cited by 56 publications

References 8 publications

The shear modulus in the fiber direction of unidirectional fiber composites based on the concept of mesophase

The shear modulus in the fiber direction of unidirectional fiber composites based on the concept of mesophase

Effect of Orientation Angles on Vibration Properties at Carbon Fiber Reinforced Polymeric Composites

Integrated Mechanics for the Passive Damping of Polymer-Matrix Composites and Composite Structures

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