A study of the tensile strength of short fiber reinforced plastics

Lees, J. K.

doi:10.1002/pen.760080304

Cited by 81 publications

(27 citation statements)

References 9 publications

(4 reference statements)

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“…Macroscopically oriented LCTs obtained by curing in the mesomorphic state inside a magnetic field led to these parameters having anisotropic characteristics. 16,30 Therefore, the CTE of macroscopically oriented materials must be lower than that of unoriented materials, and the storage modulus must be expected to increase considerably in the direction of the orientation.…”

Section: Physical Propertiesmentioning

confidence: 99%

Synthesis and crosslinking of a series of dimeric liquid‐crystalline diglycidylester compounds containing imine groups

Ribera

Mantecón

Serra

2002

J. Polym. Sci. A Polym. Chem.

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We used readily available commercial reagents and well‐known procedures to synthesize a series of aromatic imine mesogenic diglycidylester compounds with dimeric architectures. The compounds obtained were characterized by spectroscopic techniques. Their liquid‐crystalline behavior was examined by differential scanning calorimetry, hot‐stage polarized optical microscopy (POM), and wide‐angle X‐ray scattering (WAXS) and related to the different structures that varied in the length of the central spacer. All the compounds exhibited nematic mesophases with the exception of the dimer with a three‐methylene central spacer that did not reveal liquid‐crystalline character. We investigated the crosslinking of the synthesized compounds and obtained liquid‐crystalline thermosets (LCTs) with several primary aromatic diamines in stoichiometric ratios or a tertiary amine as a catalyst. The curing processes were measured by calorimetry, and the thermal stability of the LCTs was evaluated by thermogravimetry. The ordered character of the LCTs was confirmed by POM and WAXS. Finally, the mechanical characterization of the LCTs obtained was examined by dynamic mechanical thermal analysis. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 4344–4356, 2002

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Section: Physical Propertiesmentioning

confidence: 99%

Synthesis and crosslinking of a series of dimeric liquid‐crystalline diglycidylester compounds containing imine groups

Ribera

Mantecón

Serra

2002

J. Polym. Sci. A Polym. Chem.

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“…This enables us to compute k from the characteristics of the fibers and of the matrix; 1 is given by Different authors assume other hypotheses: more sophisticated theories on the elastic deformation, plastic deformation of the matrix around the fibers, or a combination of the two can be taken into a~c o u n t .~~~J~J~ In all these cases, we can compute the value of uf along the fibers, and the value of The general application of the foregoing to viscoelastic matrixes can be made fairly easily: the tensor S, is dependent upon time, as are k and 1. In expression (8), therefore, we must replace the tensors 'by functions of time. The elastic relationship (5) is obviously no longer valid, and it will be necessary to determine both K and L.…”

Section: (9)mentioning

confidence: 99%

“…Relations (3) to (8) are general, and the tensors K and L represent the transfer of the stresses due as much to the shape of the elements of the dispersed phase as to their orientation. In the case of fibers characterized by one preponderent dimension, their length, it is important to dissociate the influence of the orientation from that of the other factors affecting the reinforcement.…”

Section: (9)mentioning

confidence: 99%

Theoretical model for the elastic behavior of composites reinforced with short fibers

Ghesquiere

Bauwens

1976

J. Appl. Polym. Sci.

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SynopsisThe two simplest models that can be put forward to account for the elasticity of composite materials are the Reuss model and the Voigt model in which the constituents undergo, respectively, the same stress or the same strain. Experimental measurements always fall between the values predicted by these models. We propose correcting the Reuss model by stating u, = Ka, uf and urn being the average stresses undergone, respectively, by the reinforcing agent and the matrix. Similarly, we shall modify the Voigt model by supposing 6, = 0, tf and ern being the average strains undergone, respectively, by the reinforcing agent and the matrix. K and L are interrelated tensors which depend on the nature of the reinforcing agent, on its possible orientation, and on the mechanical behavior of the interface and also on the moduli of the constituents. We have developed the equations for determining the tensors with regard to fiber composite, taking into account the characteristics of the fibers (length, diameter, orientation, interface). The evaluation of K and L enables us, therefore, to calculate the modulus or the compliance. Conversely, by measuring the modulus or the compliance, one can determine K or L and, in this way, obtain data on the mechanism of load transfer from the matrix to the reinforcing agent and thus on the behavior of their interface. The theoretical values of the Young modulus calculated from our model are in good agreement with the experimental values obtained by Lees.8

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“…Ramsteiner and Theyson [21] used Equation (3) to obtain the shear strength of nylon 6, poly(propylene) and poly(methyl methacrylate) (PMMA) matrices. Lees [22] , on the other hand, employed the tensile strength of the matrix, r Ã m , to determine the matrix shear strength, s B , by using the Equation:…”

Section: Introductionmentioning

confidence: 99%

Variables that Determine the Fiber-Matrix Bond Strength in Ethylene-Type Ionomer Composites

Sadiku

Sanderson²

2001

Macromol. Mater. Eng.

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A study of the tensile strength of short fiber reinforced plastics

Abstract: An experimental study of the tensile strength of unidirectional short fiber reinforced plastics is reported. The data indicate agreement with existing theories as modified to suit plastics. The theory is extrapolated to provide a means for computing the strength of a random composite.

Cited by 81 publications

References 9 publications

Synthesis and crosslinking of a series of dimeric liquid‐crystalline diglycidylester compounds containing imine groups

Synthesis and crosslinking of a series of dimeric liquid‐crystalline diglycidylester compounds containing imine groups

Theoretical model for the elastic behavior of composites reinforced with short fibers

Variables that Determine the Fiber-Matrix Bond Strength in Ethylene-Type Ionomer Composites

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