Literature Review-Effects of Hydrostatic Pressure on the Mechanical Behavior of Composite Materials

Hoppel, Christopher P.; Bogetti, Travis A.; Gillespie, John W.

doi:10.1177/089270579500800403

Cited by 63 publications

(54 citation statements)

References 43 publications

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“…It is thus necessary to seek an appropriate failure criterion that accounts for this variation. Based on the work of other researchers [3][4][5][6][7][8][9], the transverse stresses have been shown to have a role to play in determining the fibre-direction strength of a lamina. So it can be deduced that the failure is likely to have happened at a material point with some maximal combination of the three principal stresses.…”

Section: Fe Results and Failure Criterionmentioning

confidence: 99%

“…However there is still a paucity of reliable experimental data for biaxial or multiaxial load cases, especially for those involving through-thickness compression and in-plane tension, due to the cost and complexity of multiaxial testing. A number of works have investigated the unidirectional tensile strength of composites under hydrostatic pressure [3][4][5][6][7][8][9]. The results of these studies show that the strength and the failure mode of composites depend strongly on the magnitude of the hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of high through-thickness compressive stress on fibre direction tensile strength of carbon/epoxy composite laminates

Gan

Wisnom

Hallett

2014

Composites Science and Technology

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The fibre-direction tensile strength of carbon/epoxy laminates under the influence of throughthickness compressive stresses has been experimentally investigated. In a unidirectional (UD) laminate, the through-thickness compressive stresses will cause premature longitudinal fibresplitting, masking the effect of transverse stresses on the fibre-direction strength. Here a cross-ply laminate has been used. With the addition of 90° plies preventing the 0° fibres from splitting, it effectively allows the dependence of fibre-direction tensile strength on high through-thickness stresses to be studied. The severity of the through-thickness loads has been varied using cylindrical indenters of different radii, up to the loads near the through-thickness compressive failure stress of the cross-ply laminate. The results show that there is a linear decrease in fibre-direction strength with the mean through-thickness stress. In all the test cases, the specimens failed in a catastrophic brittle manner, with scanning electron micrography showing primarily a fibre tensile fracture mode. The detailed stress state in the specimens has been calculated via finite element analysis. Two failure criteria are proposed, which can be used as conservative design criteria concerning fibre-dominated failures in multiaxial load scenarios. IntroductionWith the increasing use of composite materials replacing metals in aerospace applications, the need to consider complex load conditions is also increasing. Highly localised throughthickness stresses can often be seen in components where localised contact conditions exist, such as in bolted joints. These stresses may interact with co-existing primary in-plane tensile loading in the fibre-direction, leading to earlier failure. when he studied through-thickness compressive loading on unidirectional and cross-plied carbon/epoxy AS4/8552 laminates. The through-thickness stresses that interact with the unidirectional composite fibre direction strength found in the literature are mostly in the form of hydrostatic pressure, at most up to moderate values of ~700 MPa. The current study is a detailed expansion of initial results presented in [12]. In this work, a biaxial test method is developed to apply highly localised through-thickness compressive stress (locally as high as -1700 MPa, as calculated by linear elastic finite element analysis) on a simple cross-plied carbon/epoxy tensile test specimen.The high through-thickness compressive strength of a cross-plied laminate allows the interaction between a broad range of through-thickness compression and in-plane tensile strength to be examined. Multiple experimental load cases are presented and finite element models have been used to study the stresses within the specimens so that a simple failure criterion can be proposed for engineering design purposes. Experimental Specimen preparation and rig setupThe material under consideration is Hexcel's carbon epoxy pre-preg system, IM7/8552 with a nominal ply thickness of 0.125 mm. Four identical panels wi...

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Section: Fe Results and Failure Criterionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of high through-thickness compressive stress on fibre direction tensile strength of carbon/epoxy composite laminates

Gan

Wisnom

Hallett

2014

Composites Science and Technology

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“…Pressure increases interfacial normal and shear stresses, resulting in greater adhesion between fibres and matrix, whilst reducing the influence of flaws such as microcracks and voids [2]. The effects of hydrostatic pressure on the non-linear response of a UD composite are shown in figure 2a and b, indicating a change in the post-yield behaviour and an increase in elastic modulus.…”

Section: Constitutive Response Of Materialsmentioning

confidence: 99%

“…Furthermore, polymers and polymer-matrix composites yield at different stresses in tension and compression, while the elastic modulus increases with hydrostatic pressure [1][2][3].…”

Section: Constitutive Response Of Materialsmentioning

confidence: 99%

Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach

Vyas

Pinho

Robinson

2011

Composites Science and Technology

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Please cite this article as: Vyas, G.M., Pinho, S.T., Robinson, P., Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach, Composites Science and Technology (2011), doi: 10.1016/j.compscitech.2011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach AbstractThis paper presents the development of a constitutive model able to accurately represent the full non-linear mechanical response of polymer-matrix fibre-reinforced composites with unidirectional (UD) plies under quasi-static loading. This is achieved by utilising an elasto-plastic modelling framework. The model captures key features that are often neglected in constitutive modelling of UD composites, such as the effect of hydrostatic pressure on both the elastic and non-elastic material response, the effect of multiaxial loading and dependence of the yield stress on the applied pressure.The constitutive model includes a novel yield function which accurately represents the yielding of the matrix within a unidirectional fibre-reinforced composite by removing the dependence on the stress in the fibre direction. A non-associative flow rule is used to capture the pressure sensitivity of the material. The experimentally observed translation of subsequent yield surfaces is modelled using a non-linear kinematic hardening rule. Furthermore, evolution laws are proposed for the non-linear hardening that relate to the applied hydrostatic pressure. * Corresponding author Email address: gv04@imperial.ac.uk (G.M. Vyas) Preprint submitted to ElsevierMultiaxial test data is used to show that the model is able to predict the nonlinear response under complex loading combinations, given only the experimental response from two uniaxial tests.

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“…It is evident that the von Mises' and Tresca's yield criteria, which were formulated by assuming that the yielding is independent of hydrostatic pressure, are inapplicable to polymers. Previous studies [1][2][3][4][5][6] have shown that the yield strength increases approximately linearly with the hydrostatic pressure. The Drucker-Prager 7 yield criterion which takes into account the linear dependence of the yield strength on hydrostatic pressure is usually adopted and is shown below:…”

Section: Introductionmentioning

confidence: 99%

An instrumented indentation method for evaluating the effect of hydrostatic pressure on the yield strength of solid polymers

et al. 2014

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The yield behavior of solid polymers may be influenced by the hydrostatic pressure, strain rate, and temperature. In the present work, we focus on evaluating the effect of hydrostatic pressure on the yield strength by instrumented indentation. Using dimensional analysis and finite element analysis, two analytical expressions were derived to relate the indentation data to the plastic properties, and a method for extracting the coefficient of internal friction which reflects the effect of hydrostatic pressure on the yield strength was established. Applications were illustrated on polypropylene (PP), polycarbonate (PC), and unplasticized polyvinyl chloride (UPVC). The coefficient of internal friction determined by this indentation method is 0.20 6 0.02 for PP, 0.07 6 0.01 for PC, and 0.10 6 0.01 for UPVC, which are in good agreement with the values reported in the literature. This demonstrates the proposed indentation method which is useful to evaluate the effect of hydrostatic pressure on the yield strength of solid polymers.

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Literature Review-Effects of Hydrostatic Pressure on the Mechanical Behavior of Composite Materials

Cited by 63 publications

References 43 publications

Effect of high through-thickness compressive stress on fibre direction tensile strength of carbon/epoxy composite laminates

Effect of high through-thickness compressive stress on fibre direction tensile strength of carbon/epoxy composite laminates

Constitutive modelling of fibre-reinforced composites with unidirectional plies using a plasticity-based approach

An instrumented indentation method for evaluating the effect of hydrostatic pressure on the yield strength of solid polymers

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