Modeling of nonlinear viscoelastic creep of a polyethylene pipeline during water hammer

2021 ◽  
pp. 1-12
Author(s):  
Jalil Javadi Orte Cheshme ◽  
Ahmad Ahmadi ◽  
Alireza Keramat
Keyword(s):  
Water Hammer ◽  
Viscoelastic Creep ◽  
Nonlinear Viscoelastic

Modeling of Nonlinear Viscoelastic Creep of Polycarbonate

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Wenbo Luo ◽  
Said Jazouli ◽  
Toan Vu-Khanh
Keyword(s):  
Creep Behavior ◽  
Room Temperature ◽  
Multiple Integral ◽  
Model Fit ◽  
Viscoelastic Creep ◽  
Commercial Grade ◽  
Nonlinear Viscoelastic ◽  
Schapery Model ◽  
Special Case ◽  
Better Than

AbstractThe creep behavior of a commercial grade polycarbonate was investigated in this study. 10 different constant stresses ranging from 8 MPa to 50 MPa were applied to the specimen, and the resultant creep strains were measured at room temperature. It was found that the creep could be modeled linearly below 15 MPa, and nonlinearly above 15 MPa. Different nonlinear viscoelastic models have been briefly reviewed and used to fit the test data. It is shown that the Findley model is a special case of the Schapery model, and both the Findley model and the simplified multiple integral representation are suitable for properly describing the creep behavior of the polycarbonate investigated in this paper; however, the Findley model fit the data better than the simplified multiple integral with three terms.

scholarly journals Peridynamic model for nonlinear viscoelastic creep and creep rupture of Polypropylene

2019 ◽  
Vol 13 (4) ◽  
pp. 5735-5752 ◽  
Author(s):  
M. A. Azizi ◽  
A. K. Ariffin
Keyword(s):  
Internal State ◽  
Creep Behaviour ◽  
Numerical Data ◽  
Creep Rupture ◽  
Experimental Result ◽  
Viscoelastic Creep ◽  
Nonlinear Viscoelastic ◽  
Secondary Stage ◽  
Peridynamic Model ◽  
Viscoelastic Equation

This paper presents the peridynamic numerical method for nonlinear viscoelastic creep behaviour which consists of primary, secondary, tertiary creep stages and creep rupture. A nonlinear viscoelastic creep constitutive equation based on internal state variable (ISV) theory which covers four creep stages is examined. The viscoelastic equation is substituted into material parameter in the peridynamic equation to derive a new peridynamic method with two time parameters i.e. numerical time and real time. The parameters of the viscoelastic equation is analyzed and evaluated. In validating this peridynamic method, a comparison is made between numerical and experimental data. The peridynamic method for nonlinear viscoelastic creep behaviour (VE-PD) is approved by the good similarity between numerical and experimental creep strain curves with overall difference of 10.67%. The nonlinearity of experimental and numerical data is adequately similar as the error between experimental and numerical curves of secondary stage strain rate against load is 8.022%. The shapes of fractured numerical specimen show good resemblance with the experimental result as well.

scholarly journals Long term prediction of nonlinear viscoelastic creep behaviour of elastomers: extended Schapery model

2008 ◽  
Vol 9 (5) ◽  
pp. 407-416 ◽  
Author(s):  
Hatem Gacem ◽  
Yvon Chevalier ◽  
Jean-Luc Dion ◽  
Mohamed Soula ◽  
Brahim Rezgui
Keyword(s):  
Creep Behaviour ◽  
Viscoelastic Creep ◽  
Term Prediction ◽  
Nonlinear Viscoelastic ◽  
Schapery Model ◽  
Long Term Prediction

Modelling of nonlinear viscoelastic creep behaviour of hot-mix asphalt

2015 ◽  
Vol 95 ◽  
pp. 329-336 ◽  
Author(s):  
Dongdong Gao ◽  
Pengbin Wang ◽  
Ming Li ◽  
Wenbo Luo
Keyword(s):  
Hot Mix Asphalt ◽  
Creep Behaviour ◽  
Viscoelastic Creep ◽  
Nonlinear Viscoelastic

Research on Nonlinear Viscoelastic Creep Characteristic of Frozen Soft Rock of Cretaceous Formation

2013 ◽  
Vol 671-674 ◽  
pp. 257-261
Author(s):  
Jie Zhu
Keyword(s):  
Creep Compliance ◽  
Soft Rock ◽  
Creep Process ◽  
Test Results ◽  
Viscoelastic Creep ◽  
Nonlinear Viscoelastic ◽  
Uniaxial Creep ◽  
Different Temperatures ◽  
Creep Characteristic ◽  
Generalized Kelvin Model

Creep curves at different temperatures and stress-strain isochrones were abtained by using uniaxial creep test for frozen soft rocks of Cretaceous formation. The test results showed that the creep process was nonlinear,and the viscoelastic creep compliance was related to time and stress. On the basis of generalized Kelvin model,the nonlinear viscoelastic creep expression was proposed by nonlinear improvement on creep compliance and the parameters were also identified. Through the comparison between the theoretical curves and the test results,the correctness and rationality of the model are verified.

Nonlinear Viscoelastic Creep Characterization of HDPE-Rice Husk Composites

2005 ◽  
Vol 13 (6) ◽  
pp. 581-598 ◽  
Author(s):  
A. Pramanick ◽  
M. Sain
Keyword(s):  
Rice Husk ◽  
Creep Behaviour ◽  
Nonlinear Creep ◽  
Flexural Mode ◽  
Viscoelastic Creep ◽  
Nonlinear Viscoelastic ◽  
Bearing Materials ◽  
Term Creep

Rice husk based plastic composites are increasingly being used as deck-boards, railings and other load-bearing materials. Since this material typically contains 40% plastic, and plastics creep with respect to time when they carry load, creep is an important issue here. So the viscoelastic characterization of this material and the prediction of creep as a function time is of paramount importance for the material's long-term commercial success. Creep is a time related deformation but it can also be affected by the stress level and environmental conditions, such as time and temperature. In order to predict the creep of this composite, it is important to derive a relationship between deformation, time, temperature, relative humidity and stress. Nonlinearity can exist in the stress, temperature, and moisture related deformation. In this study, hollow extruded rice husk -HDPE beams were subjected to creep and recovery in flexural mode and the stress related nonlinear creep behaviour of the same was studied phenomenologically. Both linear and non-linear region constants were determined with modified models, and a predictive model was developed. These constants will be used to define, model and predict long-term creep deformation.

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

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