Three-Dimensional Inelastic Finite Element Analysis of Laminated Composites

Griffin, O. Hayden; Kamat, Manohar P.; Herakovich, Carl T.

doi:10.1177/002199838101500605

Cited by 50 publications

(8 citation statements)

References 36 publications

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“…The three-dimensional finite element program NALCOM [4] was used to predict thermal stress distributions in cross-ply ([On/90n]J and angle-ply ([+45,/ -45 j ) graphite/epoxy laminates. Figure 1 defines the coordinate system used in this paper.…”

Section: Generalmentioning

confidence: 99%

Numerical/Experimental Correlation of Three-Dimensional Thermal Stress Distributions in Graphite/Epoxy Laminates

Griffin¹,

Roberts²

1983

Journal of Composite Materials

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Three-dimensional finite element analysis was used to predict thermal stress distributions in thick graphite/epoxy laminates. The laminates analyzed were [O n /90 n ] s and [+45 n /-45 n ] s . For the [O n /90 n ] s laminates, high thermal in-plane tensile normal stresses were predicted in the transverse (2-) directions in both the 0° and 90 ° plies. High interlaminar normal (z-or 3-direction) tensile stresses were predicted to exist in the 90° plies near the center of two opposite free edges, with large compressive interlaminar normal stresses along the other two edges. Stresses were predicted to be low in all corners. In the [+45 n /-45 n ] s laminates, high in-plane transverse (2-) direction normal tensile stresses were also predicted. High tensile interlaminar normal stresses were predicted to exist at two diagonally opposite corners, with large compressive interlaminar normal stresses at the other corners. Subsequent experiments using thick laminates with similar stacking sequences slowly cooled to -150°C confirmed the predicted stress distributions and the existence of a "free corner" effect in angle-ply laminates, an effect which could not have been predicted without performing a fully three-dimensional analysis. Absence of inplane symmetry in mid-plane symmetric angle-ply laminates was predicted analytically and verified experimentally. Failure mode and location were shown, analytically (based on a maximum stress failure criterion) and experimentally, to depend on stacking sequence.

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Section: Generalmentioning

confidence: 99%

Numerical/Experimental Correlation of Three-Dimensional Thermal Stress Distributions in Graphite/Epoxy Laminates

Griffin¹,

Roberts²

1983

Journal of Composite Materials

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“…Therefore, appropriate modeling of the nonlinear behavior of FRP becomes crucial. A significant number of macro-mechanical models have been proposed to represent the constitutive relation of fiberreinforced composite materials such as nonlinear elasticity models 3,5,6 , plasticity models [7][8][9][10][11] , or damage theory coupled with elasticity 12 . In addition, various failure criteria have also been proposed to predict the onset of damage in single layer within the fiber-D Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Analysis of Fiber-Reinforced Composite Laminates Subjected to Uniaxial Compressive Load

Hu¹,

Lin

2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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A nonlinear constitutive model together with a mixed failure criterion for a single lamina is developed to simulate the behavior of composite laminates under uniaxial compression. In the model, fiber and matrix are assumed to behave elastic-plastic and the in-plane shear to behave nonlinear with a variable shear parameter. The damage onset for individual lamina is detected by a mixed failure criterion, which is composed of the Tsai-Wu criterion and the maximum stress criterion. After damage is taken place within the lamina, fiber and in-plane shear are assumed to exhibit brittle behavior and matrix to exhibit degrading behavior. This material model has been tested against experimental data and good agreement has been obtained.

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“…A yield function was formed using the stress invariants of a transversely isotropic material and simple hardening and flow rules were derived. Griffin (1981) extended HillÕs anisotropic plasticity theory, and used the associated plasticity flow rule to determine the plastic increment of strain. A Ramberg-Osgood uniaxial stress-strain relation was used to model nonlinear hardening.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear constitutive models for pultruded FRP composites

Haj-Ali

Kılıç

2003

Mechanics of Materials

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Three nonlinear multi-axial constitutive models for pultruded fiber reinforced plastic composites are proposed and examined in this study. The first two are macromechanical models that idealize the entire composite material as homogeneous orthotropic under plane stress conditions. The third is a new three-dimensional (3D) micromechanical model where the fiber and matrix responses are explicitly recognized and the nonlinear behavior is expressed at the matrix level. The pultruded composite material system considered in this study consists of two alternating layers of roving and continuous filament mat. The two layers have E-glass/vinylester fiber/matrix constituents. Coupon tests were performed for calibration and verification of the proposed models. Nonlinear response is calibrated using V-notch tests, to generate the axial-shear stress-strain, and uniaxial transverse tests. Off-axis coupons were cut with different roving orientations in order to generate in-plane multi-axial stress states. The nonlinear axial stress-strain curves of the off-axis tests are compared with the predicted curves from the three proposed models. Good agreement is shown for all off-axis angles when comparing the experimental stress-strain curves with those predicted by the 3D micromodel. The nonlinear curves predicted by the two nonlinear orthotropic models are also in good agreement with the experimental results but not for all off-axis orientations. All three models can be easily integrated within a finite element code for the general nonlinear analysis of pultruded composite structures using layered shell or 3D type elements.

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Three-Dimensional Inelastic Finite Element Analysis of Laminated Composites

Cited by 50 publications

References 36 publications

Numerical/Experimental Correlation of Three-Dimensional Thermal Stress Distributions in Graphite/Epoxy Laminates

Numerical/Experimental Correlation of Three-Dimensional Thermal Stress Distributions in Graphite/Epoxy Laminates

Nonlinear Analysis of Fiber-Reinforced Composite Laminates Subjected to Uniaxial Compressive Load

Nonlinear constitutive models for pultruded FRP composites

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