Experiments for the long-term prediction of creep strain of expanded polystyrene under compressive stress

• Published in: Polymer testing Vol. 29; no. 6; pp. 693 - 700
• Main Authors: Gnip, I.Y., Vaitkus, S., Keršulis, V., Vėjelis, S.
• Format: Journal Article
• Language: English
• Published: Kindlington Elsevier Ltd 01.09.2010; Elsevier
• Subjects: Applied sciences; Cellular; Cold flow; Compression; Compressive properties; Creep (materials); Creep strain; Exact sciences and technology; Expanded polystyrene; Forms of application and semi-finished materials; Lead time; Mathematical analysis; Polymer industry, paints, wood; Polystyrene resins; Prediction; Statistical evaluation; Strain; Stresses; Technology of polymers; Testing time; Compression; Statistical evaluation; Creep strain; Expanded polystyrene; Testing time; Prediction; Statistical analysis; Long term variation; Experimental study; Cellular plastic; Modeling; Compressive stress; Creep curve; Styrene polymer; Plastics
• ISSN: 0142-9418; 1873-2348
• DOI: 10.1016/j.polymertesting.2010.05.011

Expanded polystyrene (EPS) slabs were tested to determine their strength and the effects of creep strain under compressive stress. The results were statistically analysed based on long-term experiments between 65 and 2034 days. The analysis shows that it is possible to predict creep strain development for a lead time of 50 years on the basis of the data obtained in experiments shorter than 608 days, as specified in Standard EN 13163. Sufficiently accurate point-wise prediction of creep strain of EPS slabs under a compressive stress σ c of (0.25 and 0.35) σ 10% for a lead time of 50 years is possible by extrapolating the creep described via a power equation (Findley W.N.) and using data from the 65-day direct experiment.