Fracture mechanics of polymers

Roylance, David

doi:10.1016/0025-5416(85)90313-1

Cited by 27 publications

(41 citation statements)

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“…Equation is the Maxwell equation which relates the stress to the strain. This equation can be solved for the stress σ ( t ) once the strain ϵ ( t ) is specified, or for the strain if the stress is specified

k \overset{ϵ}{true} = \overset{σ}{true} + (σ / τ)

…”

Section: Resultsmentioning

confidence: 99%

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Improvement in thermo‐chemical stability of nanocomposite preformed particle gels for conformance control in harsh oil reservoir conditions

Saghafi¹,

Naderifar

Gerami

et al. 2016

Can J Chem Eng

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Gel treatment is one of the most promising technologies to improve conformance control in heterogeneous reservoirs. In this paper, new enhanced preformed particle gels (PPGs) are introduced for conformance control in high‐temperature and high‐salinity oil reservoirs. The thermo‐chemical stability of this product is due to the incorporation of a new monomer, N,N‐dimethyl acrylamide (DA), to the structure of the last well‐known nano‐composite PPGs. Four species, N,N‐dimethyl acrylamide, 2‐acrylamido‐2‐methylpropane sulphonic sodium salt (AMPSNa), acrylamide (AM), and N‐vinylpyrrolidone (NVP) monomers, were used to synthesize these PPGs via free radical cross‐linking polymerization at room temperature using N,N‐methylenebis (acrylamide) as a cross‐linker. The mechanical properties of these new classes of PPGs were enhanced by adding the nano‐clay montmorillonite Na+. A temperature stability agent was also used to make these special PPGs compatible with high temperature and salinity reservoir conditions. A systematic study on PPGs preparation was conducted to improve PPGs stability for harsh reservoir conditions that exist in Persian Gulf oil reservoirs (a temperature of 145 °C and a water total dissolved solid of 225 000 mg/L). PPGs prepared with 0.30 g/g (30 wt%) of a 2:1:1:2 molar mass ratio of AM, DA, NVP, and AMPSNa could be completely stable for the mentioned conditions. Rheological behaviours of these PPGs were investigated and a mathematical model for prediction of storage modulus up to onset of elastic to viscous phase was presented. The results of this study reveal useful insights about the selection of appropriate material for successful conformance control in the heterogeneous reservoirs.

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k \overset{ϵ}{true} = \overset{σ}{true} + (σ / τ)

…”

Section: Resultsmentioning

confidence: 99%

“…In the case of the dynamic response, the time dependency of both the stress and the strain are in the form of exp ( iωt ). All time derivatives will therefore contain the expression ( iω ) exp ( iωt ), so Equation gives the following:

k (i ω) ϵ_{0} \times \exp (i ω t) = (i ω + 1 / τ j) σ_{0} \times \exp (i ω t)

…”

Section: Resultsmentioning

confidence: 99%

Improvement in thermo‐chemical stability of nanocomposite preformed particle gels for conformance control in harsh oil reservoir conditions

Saghafi¹,

Naderifar

Gerami

et al. 2016

Can J Chem Eng

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“…A simple way of visualising Δ E , illustrated in Figure 6, is to regard two regions adjacent to the crack flanks, of width L and height ∼ L , as being completely unloaded, while the full stress σ is redistributed to the remaining material 11.…”

Section: Application Of the Ae Techniquementioning

confidence: 99%

“…This model was applied to the two monitored cracks, where L is the sum of the crack increments measured during the survey. Since these cracks propagated through the entire thickness s = 40 cm of the wall, the total energy Δ E made available by a crack growth of length L (and constant depth s ) is then given by the elastic energy per unit volume times the volume in both regions 11, 12: where plane stress condition and linear elastic material ( σ = Eε ) are assumed.…”

Section: Application Of the Ae Techniquementioning

confidence: 99%

Damage analysis of reinforced concrete buildings by the acoustic emission technique

Carpinteri

Lacidogna

Niccolini

2010

Struct. Control Health Monit.

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This paper presents a research work in which the stability of a multi‐storeyed building in reinforced concrete, with two visible macrocracks periodically subjected to visual inspection, is assessed by the acoustic emission (AE) technique. The observed proportionality between the rates of recorded AE activity from the cracks and the measured crack growth rates confirms significantly the effectiveness of the AE technique for damage evolution assessment in structural elements. The AE activity has been correlated with the size of the source crack advancements by some fitting relationships established using models from Damage Mechanics, Fracture Mechanics and Geophysics. Copyright © 2010 John Wiley & Sons, Ltd.

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“…Under a fourpoint bending load with third point loading scheme in which the two point loads applied at an equal distance (L/3) of the span length, as depicted in Figure 2(b), Roylance [10] recommended the following equation: As mentioned earlier, the contribution of shear deflection should be considered in sandwich panel especially when a low density core is employed. The deformation under four-point bending load is shown in Figure 3.…”

Section: Development Of Theoretical Framework For Deflection Under Fmentioning

confidence: 99%

Experimental and Theoretical Deflections of Hybrid Composite Sandwich Panel under Four-point Bending Load

Fajrin

Zhuge

Wang

et al. 2017

ced

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This paper presents a comparison of theoretical and experimental deflection of a hybrid sandwich panel under four-point bending load. The paper initially presents few basic equations developed under three-point load, followed by development of model under four-point bending load and a comparative analysis between theoretical and experimental results. It was found that the proposed model for predicting the deflection of hybrid sandwich panels provided fair agreement with the experimental values. Most of the sandwich panels showed theoretical deflection values higher than the experimental values, which is desirable in the design. It was also noticed that the introduction of intermediate layer does not contribute much to reduce the deflection of sandwich panel as the main contributor for the total deflection was the shear deformation of the core that mostly determined by the geometric of the samples and the thickness of the core.

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Fracture mechanics of polymers

Cited by 27 publications

References 0 publications

Improvement in thermo‐chemical stability of nanocomposite preformed particle gels for conformance control in harsh oil reservoir conditions

Improvement in thermo‐chemical stability of nanocomposite preformed particle gels for conformance control in harsh oil reservoir conditions

Damage analysis of reinforced concrete buildings by the acoustic emission technique

Experimental and Theoretical Deflections of Hybrid Composite Sandwich Panel under Four-point Bending Load

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