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Confidence intervals of long-term prediction and synthesis of creep compliance prediction estimates for expanded polystyrene (EPS) under permanent compressive stress
被引:3
|作者:
Gnip, I. Y.
[1
]
Vaitkus, S.
[1
]
Kersulis, V.
[1
]
Vejelis, S.
[1
]
机构:
[1] Vilnius Gediminas Tech Univ, Thermal Insulat Inst, Vilnius, Lithuania
关键词:
expanded polystyrene (EPS);
permanent compressive stress;
creep compliance;
confidence interval prediction;
synthesis of predictions;
D O I:
10.1016/j.polymertesting.2008.04.008
中图分类号:
TB3 [工程材料学];
学科分类号:
0805 ;
080502 ;
摘要:
The results obtained in investigating creep behaviour of expanded polystyrene (EPS) with a density of 16.5-33 kg/m(3), subjected to long-term compressive stress sigma(c), making 0.25 and 0.35 of stress corresponding to 10% relative deformation of the test specimens, are presented. The overall period of the direct long-term experiment was 3-4 years. Confidence interval prediction of creep compliance for the period of 50 years in the future was based on extrapolation of creep formation approximated by power and exponential regression equations which were reduced to a linear form by taking logarithms. The consistency (agreement) of particular confidence interval predictions was demonstrated and the synthesis (integration) of these extrapolation-based predictions was made. The results of synthesized predictions are presented. The dependence of the prediction estimates of creep compliance (creep strains) of expanded polystyrene on its density, permanent compression stress and time of prediction was determined. (C) 2008 Elsevier Ltd. All rights reserved.
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页码:688 / 697
页数:10
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