Effects of Hydrostatic Pressure on In-Plane Shear Properties of Graphite/Epoxy Composites

Shin, E.S.; Pae, K. D.

doi:10.1177/002199839202600604

Cited by 52 publications

(59 citation statements)

References 15 publications

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“…To do this, the MCM model assumes that at each point Figure 1. Pressure dependent strength data for fiber and matrix fracture modes in composite materials [2]. within a structure, there exists a representative volume element (RVE).…”

Section: Constitutive Modelmentioning

confidence: 99%

“…As a consequence, damage and failure predictions using traditional stress based failure criterion can often times be misleading. Factors which influence these misleading results include; stiffness and strength increases at elevated pressures [2], the retention of shearing resistance under compression and the fact that these materials often times cannot react on the time scales of the pressure wave propagations. Figure 1 shows an example of the pressure dependent strength behavior for a graphite/epoxy composite material.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a strain based failure criterion for the multi-constituent composite model under shock loading

Key

Schumacher

Alexander

2015

EPJ Web of Conferences

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Abstract. This study details and demonstrates a strain-based criterion for the prediction of polymer matrix composite material damage and failure under shock loading conditions. Shock loading conditions are characterized by high-speed impacts or explosive events that result in very high pressures in the materials involved. These material pressures can reach hundreds of kbar and often exceed the material strengths by several orders of magnitude. Researchers have shown that under these high pressures, composites exhibit significant increases in stiffness and strength. In this work we summarize modifications to a previous stress based interactive failure criterion based on the model initially proposed by Hashin, to include strain dependence. The failure criterion is combined with the multi-constituent composite constitutive model (MCM) within a shock physics hydrocode. The constitutive model allows for decomposition of the composite stress and strain fields into the individual phase averaged constituent level stress and strain fields, which are then applied to the failure criterion. Numerical simulations of a metallic sphere impacting carbon/epoxy composite plates at velocities up to 1000 m/s are performed using both the stress and strain based criterion. These simulation results are compared to experimental tests to illustrate the advantages of a strain-based criterion in the shock environment.

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Section: Constitutive Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of a strain based failure criterion for the multi-constituent composite model under shock loading

Key

Schumacher

Alexander

2015

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…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%

“…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. (a) (b) Figure 2: Effect of increasing hydrostatic pressure on shear response and modulus of a UD composite [3,6] Another significant effect is the interaction between different stress components under multiaxial loading also affects the material response. Figure 3 shows that stress components are coupled, as the shear response of a UD composite is influenced by the introduction of a stress in the transverse direction.…”

Section: Constitutive Response Of Materialsmentioning

confidence: 99%

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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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Delamination characteristics of multi‐directional carbon fiber/epoxy composites under high pressure

Rhee

Park

2001

Polymer Composites

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It was shown in a previous study that for unidirectional (0‐deg) graphite/epoxy composites, the fracture toughness under hydrostatic pressure increased 38% as hydrostatic pressure increased from 0.1 MPa to 200 MPa. This work investigates the compressive delamination behavior of multi‐directional graphite/epoxy laminated composites subjected to various hydrostatic pressures. Compressive delamination tests were performed under four hydrostatic pressure levels: 0.1, 100, 200, and 300 MPa Eighty‐eight‐ply dog‐bone type specimens with a single delamination at the center of the specimen were used. The stacking sequence applied was [0°/±45°/90°]lls. The compliance and fracture load were determined from load‐displacement curves as a function of hydrostatic pressure.The results show that the compliance decreases with increasing pressure while fracture load increases with increasing pressure. The compressive delamination toughness, Gc, was determined from the compliance method as a function of applied hydrostatic pressure. The results also show that Gc is significantly affected by hydrostatic pressure and increases from 2.11 kJ/m2 to 3.04 kJ/m2 (44% increase) as hydrostatic pressure increased from 0.1 MPa to 300 MPa. Visual examination of the fractured surface revealed that the increase of Gc is due to the suppression of micro‐cracks With increasing pressure. It was also found from SEM examination of delaminated surface that the Gc increase is due to more epoxy adhering to the fibers and more plastic deformation of epoxy material as applied hydrostatic pressure increases.

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Effects of Hydrostatic Pressure on In-Plane Shear Properties of Graphite/Epoxy Composites

Cited by 52 publications

References 15 publications

Evaluation of a strain based failure criterion for the multi-constituent composite model under shock loading

Evaluation of a strain based failure criterion for the multi-constituent composite model under shock loading

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

Delamination characteristics of multi‐directional carbon fiber/epoxy composites under high pressure

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