Application of a phenomenological viscoplasticity model to the stress relaxation behavior of unidirectional and angle-ply CFRP laminates at high temperature

Masuko, Yoichi; Kawai, Masamichi

doi:10.1016/j.compositesa.2004.01.010

Cited by 26 publications

(12 citation statements)

References 24 publications

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“…This observation motivates one to develop an inelastic constitutive model that can describe all of these characteristic features in a form applicable to structural analysis of composite laminates. The macroscopic viscoplastic constitutive models developed so far were successfully applied to description of the rate-dependent inelastic behaviors of different kinds of unidirectional composites [8][9][10][11][12][21][22][23][24]. However, they cannot distinguish between the tensile and compressive viscoplastic deformation behaviors for a given off-axis fiber orientation.…”

Section: A Viscoplasticity Model Considering Tension-compression Asymmentioning

confidence: 99%

“…By means of the extended effective stress and the effective viscoplastic strain rate, the isotropic-hardening viscoplasticity model [22][23][24] for unidirectional composites is generalized so that it is furnished with an enhanced capability to describe the different nonlinear deformation behaviors of unidirectional composites under off-axis tension and compression. No yielding is assumed in the fiber direction as in the Sun-Chen plasticity model.…”

Section: A Viscoplasticity Model Considering Tension-compression Asymmentioning

confidence: 99%

“…The modified effective stress is then reduced to the original form given by Sun and Chen, and the viscoplasticity model that considers the tension-compression asymmetry is reduced to the tension-compression symmetry model tested in the previous studies [22][23][24]. As a result, all the material constants involved except for the additional constant c can be determined on the basis of the off-axis tensile behavior.…”

Section: Materials Identificationmentioning

confidence: 99%

“…As a result, all the material constants involved except for the additional constant c can be determined on the basis of the off-axis tensile behavior. The detailed procedure for their identification can be found in the previous reports [22][23][24]. The value of c is roughly evaluated first by comparing the yield stress levels in tension and compression, and then it is modified so as to improve the accuracy of prediction of the compressive stress-strain curve for θ = 90 Table 3.…”

Section: Materials Identificationmentioning

confidence: 99%

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Tension–Compression Asymmetry in the Off-Axis Nonlinear Rate-Dependent Behavior of a Unidirectional Carbon/Epoxy Laminate at High Temperature and Incorporation into Viscoplasticity Modeling

Kawai

Zhang

Saito

et al. 2009

Advanced Composite Materials

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Off-axis compressive deformation behavior of a unidirectional CFRP laminate at high temperature and its strain-rate dependence in a quasi-static range are examined for various fiber orientations. By comparing the off-axis compressive and tensile behaviors at an equal strain rate, the effect of different loading modes on the flow stress level, rate-dependence and nonlinearity of the off-axis inelastic deformation is elucidated. The experimental results indicate that the compressive flow stress levels for relatively larger off-axis angles of 30 • , 45 • and 90 • are about 50 percent larger than in tension for the same fiber orientations, respectively. The nonlinear deformations under off-axis tensile and compressive loading conditions exhibit significant strainrate dependence. Similar features are observed in the fiber-orientation dependence of the off-axis flow stress levels under tension and compression and in the off-axis flow stress differential in tension and compression, regardless of the strain rate. A phenomenological theory of viscoplasticity is then developed which can describe the tension-compression asymmetry as well as the rate dependence, nonlinearity and fiber orientation dependence of the off-axis tensile and compressive behaviors of unidirectional composites in a unified manner. It is demonstrated by comparing with experimental results that the proposed viscoplastic constitutive model can be applied with reasonable accuracy to predict the different, nonlinear and rate-dependent behaviors of the unidirectional composite under off-axis tensile and compressive loading conditions.

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Section: A Viscoplasticity Model Considering Tension-compression Asymmentioning

confidence: 99%

Section: A Viscoplasticity Model Considering Tension-compression Asymmentioning

confidence: 99%

Section: Materials Identificationmentioning

confidence: 99%

Section: Materials Identificationmentioning

confidence: 99%

See 2 more Smart Citations

Tension–Compression Asymmetry in the Off-Axis Nonlinear Rate-Dependent Behavior of a Unidirectional Carbon/Epoxy Laminate at High Temperature and Incorporation into Viscoplasticity Modeling

Kawai

Zhang

Saito

et al. 2009

Advanced Composite Materials

Self Cite

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“…Although it is possible to determine the Green-Lagrange strain tensor [from Eqs. (12) to (13)] for every material point calculation, this is not entirely necessary. This computational effort can be avoided as the deformation gradient components in the local material system are already available from the fi nite element calculations and are normally passed into the user-defi ned material interface.…”

Section: Failure Assessment For Large Deformation Loadingmentioning

confidence: 99%

Failure assessment of a woven E-glass/vinyl ester composite subjected to large deformation loading

Hufner

Xing

Accorsi

2012

Science and Engineering of Composite Materials

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Woven polymer-based composites exhibit highly non-linear behavior, which often results in very high strains to failure. A micromechanical model is developed to represent the large deformation kinematics of woven composites, and develop predictions for failure strain components in specifi c cases of multiaxial loading. Failure functions are proposed for macromechanical analyses of arbitrary cases of large deformation loading. The approach is validated against basic tension experiments performed using both digital image correlation and with specially designed instrumentation for large strain measurement. Predicted failure strains correspond well with experimental observations. The proposed failure functions are well suited for fi nite element applications involving user-defi ned material models.

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Viscoplastic analysis of fiber reinforced polymer matrix composites under various loading conditions

Guedes

2008

Polymer Composites

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The present study aims modeling the viscoplastic behavior of polymer matrix composite laminates under different loading conditions. The adopted model is based on the one-parameter plasticity model employed to predict the plastic part of the recognized nonlinear behavior of fiber composites [C.T. Sun and J.L. Chen, J. Compos. Mater., 23, 1009 (1989)]. This model evolved to a three-parameter constitutive viscoplastic model used to describe successfully the strain-rate dependent mechanical behavior. Based on this model, designated as 3PV, a numerical implementation was made, based on the Classical Laminate Theory (CTL), to simulate non-linear behavior of general laminates. The validation of this numerical implementation was performed using experimental data reported in literature. The first step was to assess the model predictions under high strain rates. The model was able to model high strain rate mechanical response, of an epoxy system reinforced with glass fibers, between 10 and 2,500 s 21 . Furthermore the model proved to be reasonable accurate to simulate creep, stress relaxation and constant strain rate loading of the same material system under high temperatures. Following the experimental observations of vsicoplasticity strain evaluation during load and unloading made by Kim and Tsai [J. Compos. Mater. 36(6), 745 (2002)], a simple model modification is suggested. This modified model proved accurate enough to simulate relaxation successfully of a composite during loading and unloading.

show abstract

Application of a phenomenological viscoplasticity model to the stress relaxation behavior of unidirectional and angle-ply CFRP laminates at high temperature

Cited by 26 publications

References 24 publications

Tension–Compression Asymmetry in the Off-Axis Nonlinear Rate-Dependent Behavior of a Unidirectional Carbon/Epoxy Laminate at High Temperature and Incorporation into Viscoplasticity Modeling

Tension–Compression Asymmetry in the Off-Axis Nonlinear Rate-Dependent Behavior of a Unidirectional Carbon/Epoxy Laminate at High Temperature and Incorporation into Viscoplasticity Modeling

Failure assessment of a woven E-glass/vinyl ester composite subjected to large deformation loading

Viscoplastic analysis of fiber reinforced polymer matrix composites under various loading conditions

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