The Effect of Matrix Microcracks on the Stress-Strain Relationship in Fiber                Composite Tubes

Sj, Roberts; Evans, J.T.; Gibson, A.G.; Frost, S.R.

doi:10.1177/0021998303034360

Cited by 15 publications

(15 citation statements)

References 19 publications

(20 reference statements)

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“…Hence, the relationship between the crack density and applied stress can be derived (Roberts, Evans, Gibson, & Frost, 2003) and given below;…”

Section: Non-linear Responsementioning

confidence: 99%

“…For close adaptation to the experimentally determined curve of all stress ratios, the curve fitting constants α E2 and α G were fitted by optimizing one constant at a time while retaining the value of the other. σ 2 fail , which is transverse failure stress, was adjusted and assigned to a constant value, thus demonstrating the effects of total stress on the laminate (Roberts et al, 2003). The effective modulus was then applied with laminate theory to determine the new corresponding axial and hoop modulus of the pipe after taking into account the effects of the matrix cracking.…”

Section: Non-linear Responsementioning

confidence: 99%

See 1 more Smart Citation

Stress-Strain Response Modelling of Glass Fibre Reinforced Epoxy Composite Pipes under Multiaxial Loadings

Majid¹,

Daud²,

Afendi³

et al. 2014

J MECH ENG SCI

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This paper presents the modelling of the stress strain response of glass fiber reinforced epoxy (GRE) composite pipes subjected to multiaxial loadings at room temperature (RT). This particular modeling work was developed to predict the non-linear stress strain response caused by the fatigue cyclic and static loading in the multiaxial ultimate elastic wall stress (UEWS) tests by considering the effects of matrix cracking within the laminates. The UEWS test, whilst not yet standardized, appears to offer an attractive alternative to existing procedures of qualifying GRE pipes. The ply properties initially expressed as a function of crack density were computed as a function of increasing stress and strain using shear lag approximation. The results show that the model developed from the classical laminate theory which takes into account whether the effects of transverse matrix micro-cracks on stiffness and strains is capable of predicting the resulted elastic properties. The predictions are found to be in good agreement with the data from multiaxial UEWS tests on ±55° filament wound glass-reinforced epoxy pipes.Keywords: Stress strain response; multiaxial loadings; composite pipes; cyclic and static loading; crack density. INTRODUCTIONThe failure behavior of filament wound GRE pipes subjected to biaxial load has been the subject of numerous experimental and modelling investigations spanning decades, as demonstrated in the literature (Bachtiar, Sapuan, & Hamdan, 2010;Carvalho & Marques, 2007;Frost & Cervenka, 1994;Gibson, Saied, Evans, & Hale, 2003a, 2003bHale, Shaw, Speake, & Gibson, 2000;Hull, Legg, & Spencer, 1978;Jeffrey, Tarlochan, & Rahman, 2011;Meijer & Ellyin, 2008;Mertiny & Ellyin, 2006;Ravi Sankar, Srikant, Vamsi Krishna, Bhujanga Rao, & Bangaru Babu, 2013;Salleh, Yusop, & Rosdi, 2013;Tarakcioglu, Gemi, & Yapici, 2005). The majority of such investigations have emphasized failure envelopes, fatigue strength, leakage and the associated deformation of angle ply laminates similar to those used in GRE pipes. However, whilst most of these studies concentrated on structural failure in composite pipes, the more significant issue of micro structural progressive damage, which leads to the final failure, is less clear. Most of the literature has reported that filament wound composite pipes under fatigue biaxial load failed due to sequences of damage which

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“…Hence, the relationship between the crack density and applied stress can be derived (Roberts, Evans, Gibson, & Frost, 2003) and given below;…”

Section: Non-linear Responsementioning

confidence: 99%

Section: Non-linear Responsementioning

confidence: 99%

Stress-Strain Response Modelling of Glass Fibre Reinforced Epoxy Composite Pipes under Multiaxial Loadings

Majid¹,

Daud²,

Afendi³

et al. 2014

J MECH ENG SCI

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show abstract

“…the reciprocal of crack spacing. The model used by Roberts et al [6], based on the previous work of Zang and Gudmundson [7,8], applies to microcracks with crack surfaces parallel to the fibre direction and perpendicular to the lamina plane.…”

Section: Specific Modulus Of Different Materialsmentioning

confidence: 99%

Understanding and predicting stiffness in advanced fibre-reinforced polymer (FRP) composites for structural applications

Guedes

Xavier²

2013

Advanced Fibre-Reinforced Polymer (FRP) Composites for Structural Applications

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This chapter describes the elastic qualities of advanced fibrereinforced composites, in terms of characterization, measurement and prediction from the basic constituents, i.e. the fibre and matrix. The elastic analysis comprises applying micromechanics approaches to predict the lamina elastic properties from the basic constituents, and using classical lamination theory to predict the elastic properties of composite materials composed of several laminae stacked at different orientations. Examples are given to illustrate the theoretical analysis and give a full apprehension of its prediction capability. The last section provides an overview on identification methods for elastic proprieties based on full-field measurements. It is shown that these methodologies are very convenient for elastic characterization of anisotropic and heterogeneous materials.

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“…Plain composite pipes [7][8][9]11,12,19 are widely used in a broad range of oil and gas applications, E-glass being the dominant reinforcement for economic reasons. The choice of epoxy resin for the matrix has been driven by its excellent chemical resistance, compared to other thermosets.…”

Section: Non-metallic Pipe Products Fibreglass Pipingmentioning

confidence: 99%

“…Figure 6a shows weepage, the main failure mode in fibreglass pipes. [7][8][9]11,12 Composite materials show time dependent damage accumulation, in the form of matrix cracks, as in Fig. 6b, which run parallel to the fibres.…”

Section: Non-metallic Pipe Products Fibreglass Pipingmentioning

confidence: 99%

Non-metallic pipe systems for use in oil and gas

Gibson

Linden

Elder³

et al. 2011

Plastics, Rubber and Composites

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This paper relates to the expanding use of non-metallic materials in piping for the transport of oilfield fluids, onshore and offshore. Qualification processes for thermoplastic and composite pipework all involve long term stress rupture tests to establish a relationship between pressure and time to failure. These qualification tests are needed to account for particular long term failure process that occur in non-metallics, and are essential to the successful application of these materials. Uses of both thermoplastics and composites in several types of pipework are discussed. These include fibreglass pipe, spoolable thermosets, reinforced thermoplastic pipe, flexible risers, rigid risers and, finally, repair and rehabilitation.

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The Effect of Matrix Microcracks on the Stress-Strain Relationship in Fiber Composite Tubes

Cited by 15 publications

References 19 publications

Stress-Strain Response Modelling of Glass Fibre Reinforced Epoxy Composite Pipes under Multiaxial Loadings

Stress-Strain Response Modelling of Glass Fibre Reinforced Epoxy Composite Pipes under Multiaxial Loadings

Understanding and predicting stiffness in advanced fibre-reinforced polymer (FRP) composites for structural applications

Non-metallic pipe systems for use in oil and gas

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