A unifying strain criterion for fracture of fibrous composite laminates

Poe, C. C.

doi:10.1016/0013-7944(83)90166-2

Cited by 48 publications

(16 citation statements)

References 8 publications

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“…The characteristic distance, do, was suggested by Poe to be independent of layup [14]. It is assumed in this work that the do value measured from one layup with a through-the-thickness crack is the same for other layups with part through-thethickness cracks.…”

Section: Residual Strength Prediction For Laminate Containing Impact mentioning

confidence: 99%

“…The ultimate tensile load of the damaged laminate was assumed to be determined by failure of fibers in the key load carrying plies. This failure was predicted on the basis of a procedure developed by Pbe [14], in which fiber failure in a given ply is predicted when the fiber direction strain at a certain distance away from the broken fiber region reaches the allowable tensile fiber strain. Failure of the entire laminate is assumed to follow failure of the principal load carrying plies.…”

Section: Review Of Previous Modelmentioning

confidence: 99%

“…The residual strength prediction was performed using the principal load carrying ply criterion by Poe [14]. This criterion predicts laminate failure from the fracture of the principal load carrying plies.…”

Section: Residual Strength Prediction For Laminate Containing Impact mentioning

confidence: 99%

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Residual Tensile Strength Prediction on a Ply-by-Ply Basis for Laminates Containing Impact Damage

Tian

Swanson

1992

Journal of Composite Materials

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Impact loading on composite laminates can cause surface or internal damage in the form of fiber breakage, delamination and matrix cracking. Such damage can reduce laminate tensile strength. In the work presented here, impact damage was modelled as part through-the-thickness damage and laminate residual strength was evaluated by examining the behavior of each individual ply of the laminate. A residual strength prediction procedure, proposed previously for laminates containing cut internal fibers, was used here for laminates containing impact damage. The prediction of laminate residual strength was performed based on 3-D finite element results in conjunction with a principal load carrying ply failure criterion. The predicted residual strength agreed with the experimental data within the bounds of 0.85 to 1.08 times the experimental data, indicating the applicability of the procedure and the damage modelling technique.

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Section: Residual Strength Prediction For Laminate Containing Impact mentioning

confidence: 99%

Section: Review Of Previous Modelmentioning

confidence: 99%

See 1 more Smart Citation

Residual Tensile Strength Prediction on a Ply-by-Ply Basis for Laminates Containing Impact Damage

Tian

Swanson

1992

Journal of Composite Materials

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“…This failure criterion is suitably modified for each quadrant in stress-space to form a closed surface. For the specific case of a mixed mode crack in a fiber-reinforced composite under tensile loading Equation (19) is used in the following form to predict the failure of the material:…”

Section: Quadratic Surfaces Criterionmentioning

confidence: 99%

Analytical Damage Zone Size Predictions for Notched Laminated Composites

Yeh

Berryhill

Yeh

2004

Journal of Reinforced Plastics and Composites

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The purpose of this study was to investigate the significance of damage zone size as a parameter for evaluating the fracture strength of center-cracked laminated composites.Using experimental data for a symmetrical, generally orthotropic graphite-epoxy laminate, the damage zone sizes predicted by the Average Stress Criterion and Point Stress Criterion, as well as the D-Criterion, were compared. Additionally, limited data for the Quadratic Surfaces and Sequential Fiber Failure Criteria were evaluated.Experimental measurements of crack-tip damage zone size were used to establish a physical reference point by which all of the theories were compared.The preliminary results of this study indicate that the characteristic lengths defined by the Quadratic Surfaces and Sequential Fiber Failure Criteria are not representative of the measured damage zone size and need further investigation.

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“…It was proposed by Neuber [12] that stresses or strains be evaluated over a distance rather than at the peak value adjacent to the stress concentration. This idea was applied to fiber composite laminates by Whitney and Nuismer [13] using stress values and by Poe [14] using strain on a ply basis. It is usually postulated that the distance is a material parameter.…”

Section: Damage and Failure Modelsmentioning

confidence: 99%

Interpretation of Scaling of Damage and Failure in Fiber Composite Laminates

Swanson

1994

Journal of Thermoplastic Composite Materials

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It is often useful to predict the behavior of large structures from the results of tests on subscale articles. While the scaling of the linear elastic response of fiber composite structures is at least reasonably well understood, scaling of damage formation and failure is relatively unexplored. Idealized models of failure processes predict various effects of changes in size. Extrapolation of failure results with size thus requires proper interpretation of the failure mechanisms involved. A series of impact tests was recently carried out in which scaling with respect to size was a primary variable. An analysis of the data from these tests indicates a number of important results with respect to the models of failure mechanisms mentioned above. A primary result is that propagation of delamination closely follows the dependence on absolute size predicted by fracture mechanics and energy release rate analyses. Conversely, fiber breakage does not appear to show a dependence on absolute size. The primary thrust of the paper is to assess the implications of the experimental results in terms of the failure models and the effect on scaling of results.

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A unifying strain criterion for fracture of fibrous composite laminates

Cited by 48 publications

References 8 publications

Residual Tensile Strength Prediction on a Ply-by-Ply Basis for Laminates Containing Impact Damage

Residual Tensile Strength Prediction on a Ply-by-Ply Basis for Laminates Containing Impact Damage

Analytical Damage Zone Size Predictions for Notched Laminated Composites

Interpretation of Scaling of Damage and Failure in Fiber Composite Laminates

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