Compressive Creep of Virgin HDPE Using Equivalent Strain Energy Density Method

Bozorg-Haddad, Amir; Iskander, Magued; Wang, Hsiao Lun

doi:10.1061/(asce)mt.1943-5533.0000136

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…These observations are also found in SuescunFlorez et al [12] for granular media loaded in uniaxial compression. In addition, these results are consistent with Bozorg-Haddad et al [40,41] for virgin and recycled plastics respectively.…”

Section: Verification Of Strain Rate Pairs Calculationsupporting

confidence: 90%

“…The value of m converges to a constant value of 0.048 and 0.027, for virgin and recycled HDPE, respectively, when tests with at least a difference of 2 or more orders of magnitude in their strain rates are used [40,41].…”

Section: Methods Based On the Equivalent Strain Energy Density (Sed) Fmentioning

confidence: 88%

“…In the conventional SED method, a linear fit is applied to the strain-stress curves to find the modulus of elasticity and calculate the strain energy density as the area of a triangle under the stress-strain curve [40,41]. The proposed model, on the other hand, accounts for the viscoplasticity of sand by applying a stepped visco-elastic model piece-meal, such that each portion of the stress-strain curve has a different value of m. In keeping with the fundamental SED hypothesis, the value of m changes as SED increases along a loading curve.…”

Section: Sed Applied To Modeling Stress-strain Behavior Of Granular Mmentioning

confidence: 99%

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A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

Suescun-Florez

Iskander

Bless

2015

J. dynamic behavior mater.

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A new method is proposed and evaluated to model the effect of strain rate on sand during triaxial compression. Triaxial compression tests were conducted on dry silica sand with rates of 0.1-10 %/s at 100-400 kPa confining pressures. Rate effects become significant at the higher confining pressures. It is found that a modified strain-energy-density approach provides a useful means to interpolate and extrapolate constant strain rate triaxial data to other strain rates.

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Section: Verification Of Strain Rate Pairs Calculationsupporting

confidence: 90%

Section: Methods Based On the Equivalent Strain Energy Density (Sed) Fmentioning

confidence: 88%

Section: Sed Applied To Modeling Stress-strain Behavior Of Granular Mmentioning

confidence: 99%

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A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

Suescun-Florez

Iskander

Bless

2015

J. dynamic behavior mater.

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“…• Energy Methods, such as the strain energy density method which take advantage of the equivalence of energy points in specimens tested using different strain rates. Thus creep is predicted by extrapolating the stress-strain behavior of specimens tested under different strain rates to obtain long term static creep [6,15,16].…”

Section: Creep Of Polymersmentioning

confidence: 99%

“…Virgin polymers have been used successfully in geosynthetics and seismic retrofitting of structures, and methods to predict their tensile creep are available [5]. Nevertheless, there is little data on the compressive creep of recycled HDPE or FRP that can be used to calibrate predictive models of pile creep [6]. Therefore, this study was performed in order to characterize the long term compressive-creep behavior of RPP.…”

Section: Introductionmentioning

confidence: 99%

Compressive Creep of Reinforced Polymeric Piling

Bozorg-Haddad¹,

Iskander

2011

Testing and Specification of Recycled Materials for Sustainable Geotechnical Construction

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Reinforced polymeric piling (RPP) is a sustainable piling product that is gaining attention for use instead of timber piling in coastal and waterfront applications. However, unlike conventional construction materials that have well-documented creep behavior, there is virtually no reliable data on the compressive creep behavior of RPP. RPP is composed of a recycled plastic matrix made of high density polyethylene (HDPE) that is reinforced with steel or fiber reinforced polymer rods (FRP, E-glass, or fiberglass). In this study, an accelerated test method to predict the compressive creep of both recycled HDPE and FRP is employed. The method is based on the equivalence of strain energy density (SED) between conventional constant-stress creep tests and stress-strain tests, conducted at different strain rates. Test results indicate that the tested recycled HDPE exhibited a pronounced viscoelastic or viscoplastic response, at low strains, when loaded in compression. At room temperature, SED predicts that recycled HDPE will creep about 1.1 % in 100 years when loaded at an ultimate stress of 8.3 MPa (1200 psi). FRP exhibits a small viscoelastic tendency. SED predicts that the FRP loaded in compression will creep by less than 0.5 % in 100 years when loaded at an ultimate stress of 88 MPa (12 800 psi). The stress-strain behavior of RPP depends on strain compatibility of both HDPE and FRP. Creep of RPP will depend on the percentage of FRP reinforcement in the cross section. Creep of RPP is estimated to be on the order of 0.2 % to 1.8 % in 100 years under loading and reinforcement ratios employed for this research.

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Fracture criterion on the basis of uniformity of plastic work of polycrystalline ductile materials under various stress states

Zhao

Liu

2016

Acta Mech

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Compressive Creep of Virgin HDPE Using Equivalent Strain Energy Density Method

Cited by 15 publications

References 23 publications

A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

A Model to Predict Strain Rate Dependency of Dry Silica Sand in Triaxial Compression

Compressive Creep of Reinforced Polymeric Piling

Fracture criterion on the basis of uniformity of plastic work of polycrystalline ductile materials under various stress states

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