A New End Tab Design for Off-Axis Tension Test of Composite Materials

Sun, C. T.; Berreth, S.P.

doi:10.1177/002199838802200805

Cited by 42 publications

(11 citation statements)

References 13 publications

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“…More specifically, the conventional rectangular-shaped tabs were used for 90° off-axis samples. In order to reduce the end-constrain effect induced by rigid clamps [25], the oblique end-tabs [26,27] were applied for 10°, 20° and 45° off-axis samples.…”

Section: Methodsmentioning

confidence: 99%

Tensile Creep Behavior of Quasi-Unidirectional E-Glass Fabric Reinforced Polypropylene Composite

2018

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The present work addressed the creep behavior of quasi-unidirectional E-glass fabric reinforced polypropylene composites under off-axis tensile loading. A series of creep tests were performed on the composite at three different loading stress levels. The creep response of off-axis samples of quasi-unidirectional composites under a constant loading level can be clearly observed. A phenomenological viscoplasticity model was built for describing the creep behavior of the composite. To improve the accuracy of prediction, cyclic loading-unloading tests were adopted to determine the material constants in the model. The predicted results in terms of the strains after a load over a period of time were found to be satisfactory, compared with the experimental results. In addition, same failure mechanism was found in off-axis samples under quasi-static and creep loading cases.

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Section: Methodsmentioning

confidence: 99%

Tensile Creep Behavior of Quasi-Unidirectional E-Glass Fabric Reinforced Polypropylene Composite

2018

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“…The experimental work contained herein is in accordance with ASTM standards for the measurement of tensile [4] and shear [5] properties of fiber-reinforced polymers. The concept and design of the off-axis specimens for measuring shear properties was presented in [6], while improvements to this technique such as end-tab design and rotating grip fixtures have appeared in numerous publications [7][8][9]. In addition, the nonlinear constitutive models employed in the current effort are presented in a number of textbooks [10].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Tensile and Shear Behavior of Macro Fiber Composite Actuators

Williams

Inman

Schultz

et al. 2004

Journal of Composite Materials

103

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The Macro Fiber Composite (MFC) actuator, developed at the NASA Langley Research Center, offers much higher flexibility and induced strain levels (~2000μσ, peak-to-peak) than its monolithic piezoceramic predecessors. The focus of this work is twofold; to measure the four independent linear elastic engineering constants of the orthotropic MFC actuator under short-circuit electrical boundary conditions using standard tensile testing procedures, and to use these experimental results to characterize the nonlinear tensile and shear stress–strain behavior and Poisson effects using various plastic deformation models. The results can then be readily incorporated into the piezoelectric constitutive equation and ultimately into structural actuation models that accurately consider nonlinear mechanical behavior.

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“…Conventional knowledge indicates that for end-grip effects, extension-shear coupling may be presented in off-axis tests. Some general methods for solving the problem include the formation of specimens with large aspect ratio, selection of long tapered tabs with different compliant soft materials that allow for shear deformation, 29,30 adoption of pinnedend fixture that releases the rotational displacement produced by the rigid grip, [31][32][33] and an obliqueshaped end-tab with an oblique angle using the confrontation principle of shear deformation. 34 In this study, a novel rotating-grip test fixture proposed by Xiao et al 35 was applied for the tension and compression measurements for reducing the stress concentration in close proximity to the end and producing relatively uniform stress distributions in the specimen gage section.…”

Section: Methodsmentioning

confidence: 99%

Some improvements on Sun–Chen’s one-parameter plasticity model for fibrous composites – Part I: Constitutive modelling for tension–compression asymmetry response

Wang

Xiao

2016

Journal of Composite Materials

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Herein, a one-parameter plasticity model proposed by Sun and Chen [Sun CT and Chen JL. A simple flow rule for characterizing nonlinear behavior of fiber composites. J Compos Mater 1989; 23: 1009-1020] demonstrates features that make it highly attractive for characterizing non-linear responses of fibrous composites. However, a detailed exploitation of the model's potential has been halted by unresolved problems that include tension-compression asymmetry in stressstrain curves, FEM implementation as well as optimal parameters determination, which are addressed in this investigation as well as proposed solutions are presented. The major focus in Part I of this three-part study was devoted to developing a simple model for predicting the tension-compression asymmetry in stress-strain curves for fibrous composites, which was based on Sun and Chen's one-parameter plasticity model. A generalized Hill yield criterion was proposed from combinations of the Drucker-Prager yield criterion that considers the effect of hydrostatic pressure for isotropic materials and the Hill yield criterion suitable for anisotropic materials. By incorporating the yield strength-differential effect on the plastic flow rule in composite laminates, the one-parameter plasticity model was extended to a strengthdifferential effect-incorporated model. The improved model has been calibrated and validated by off-axis tension and compression tests on unidirectional carbon/epoxy (IM600/Q133) composite laminates. Results verified that the proposed model captured the complex tension-compression asymmetry in observed non-linear responses of stress-strain curves.

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A New End Tab Design for Off-Axis Tension Test of Composite Materials

Cited by 42 publications

References 13 publications

Tensile Creep Behavior of Quasi-Unidirectional E-Glass Fabric Reinforced Polypropylene Composite

Tensile Creep Behavior of Quasi-Unidirectional E-Glass Fabric Reinforced Polypropylene Composite

Nonlinear Tensile and Shear Behavior of Macro Fiber Composite Actuators

Some improvements on Sun–Chen’s one-parameter plasticity model for fibrous composites – Part I: Constitutive modelling for tension–compression asymmetry response

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