Comparison of composite damage growth tools for static behavior of notched composite laminates

Engelstad, Stephen P.; Clay, Stephen B.

doi:10.1177/0021998316675945

Cited by 28 publications

(19 citation statements)

References 10 publications

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“…The static benchmarking exercise was described in detail in previous publications. [1][2][3] For the static portion of the program, the analysis teams performed progressive damage blind predictions on unnotched and open-hole coupon failures in both tension and compression. Across all teams, the overall average difference between the blind strength predictions and the mean experimental strength was found to be 18%.…”

Section: Introductionmentioning

confidence: 99%

Experimental results of fatigue testing for calibration and validation of composite progressive damage analysis methods

Clay

Knoth

2016

Journal of Composite Materials

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The Air Force Research Laboratory led a research effort to benchmark the accuracy of static and fatigue predictions of several emerging composite progressive damage analysis techniques. The static portion of this technical effort is described in detail in a previous special issue of the Journal of Composite Materials. This paper provides the details of the fatigue experiments that were conducted to calibrate and validate the computational models. Initially, in-plane and out-of-plane S–N curves were generated through coupon tests that were performed on unidirectional laminae. The challenges experienced during fatigue testing of in-plane, matrix-dominated unidirectional coupon specimens are presented in detail. The higher fidelity test data from the fiber-dominated and out-of-plane experiments are also included in this paper. Following the calibration experiments, a series of tension–tension fatigue validation tests were conducted on open-hole coupons with three different stacking sequences. Each specimen was cycled to a pre-determined number of fatigue cycles, followed by static residual strength tests in both tension and compression. This paper provides the stress–strain responses of these validation tests as well as high-resolution X-ray computed tomography images of the subsurface damage as a function of cycles. Seven analysis teams used these test results to calibrate their models and to benchmark the accuracy of their predictions of damage and residual mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Experimental results of fatigue testing for calibration and validation of composite progressive damage analysis methods

Clay

Knoth

2016

Journal of Composite Materials

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“…Another approach is to reverse engineer the constituent properties from macro-scale experimental results. This was extensively used in the recent composite failure prediction benchmark organized by the Air Force Research Laboratory [26,27] where several participants calibrated the constituent properties on the available experimental data [28,29]. 25 Note that, although the reverse engineering approach is promising, it can only be used to estimate the properties of the constituent fibres and matrix in micro-scale models.…”

Section: Introductionmentioning

confidence: 99%

Multiscale approach for identification of transverse isotropic carbon fibre properties and prediction of woven elastic properties using ultrasonic identification

Sevenois

Garoz

Verboven

et al. 2018

Composites Science and Technology

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In this work the possibility to reverse engineer the transverse isotropic carbon fibre properties from the 3D homogenized elastic tensor of the UD ply for the prediction of woven ply properties is explored. Ultrasonic insonification is used to measure the propagation velocity of both the longitudinally and transversally polarized bulk waves at various symmetry planes of a unidirectional (UD) Carbon/Epoxy laminate. These velocities and the samples' dimensions and density are combined to obtain the full 3D orthotropic stiffness tensor of the ply. The properties are subsequently used to reverse engineer the stiffness tensor, assumed to be transversely isotropic, of the carbon fibres. To this end, four micro-scale homogenization methods are explored: 2 analytical models (Mori-Tanaka and Mori-Tanaka-Lielens), 1 semi-empirical (Chamis) and 1 finite-element (FE) homogenization (randomly distributed fibres in a Representative Volume Element). Next, the identified fibre properties are used to predict the elastic parameters of UD plies with multiple fibre volume fractions. These are then used to model the fibre bundles (yarns) in a meso-scale FE model of a plain woven carbon/epoxy material. Finally, the predicted elastic response of the woven carbon/epoxy is compared to the experimentally obtained elastic stiffness tensor. The predicted and measured properties are in good agreement. Some discrepancy exists between the ultrasonically measured value of the Poisson's ratio and the predicted value.Nonetheless, it is shown that virtual identification and prediction of mechanical properties for woven plies is feasible.

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“…15 The necessity for several adjustment and calibrations also made the reliability of the results debatable. 19 According to the available literature, 17–22 these methods still need to be matured to provide reliable predictions for variable amplitude fatigue failure incidents.…”

Section: Introductionmentioning

confidence: 99%

Fatigue damage simulation of tension-tension loaded glass/polyester fiber composites with thickness tapering effects

Hosseiny

Jakobsen

2018

Journal of Composite Materials

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This study evaluates the capability of a progressive damage method in predicting the fatigue failure in glass/polyester fiber composite materials. Residual material properties in different failure modes have been obtained from testing fatigue-loaded specimens to their ultimate limits. A numerical tool utilizes the experimentally obtained values to simulate the process of damage in more complex models with high interlaminar shear stresses. The tool accounts for fatigue damage through stiffness and strength degradation rules without relying on prior calibration/modifications. Benchmark ply-drop problems under constant and variable amplitude fatigue loadings are simulated and compared against experimental results. Verification case studies show that the numerical tool can predict damage initiation and final fatigue life, successfully.

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Comparison of composite damage growth tools for static behavior of notched composite laminates

Cited by 28 publications

References 10 publications

Experimental results of fatigue testing for calibration and validation of composite progressive damage analysis methods

Experimental results of fatigue testing for calibration and validation of composite progressive damage analysis methods

Multiscale approach for identification of transverse isotropic carbon fibre properties and prediction of woven elastic properties using ultrasonic identification

Fatigue damage simulation of tension-tension loaded glass/polyester fiber composites with thickness tapering effects

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