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第四届亚洲土工合成材料学术大会论文集 英文版_64.docx

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the specific materials being tested and when the type ofdegradation is the same.For exposure cycle for coatings and plastics the ASTMG154 suggests UVA 340 lamps (8 h UV at 60 ± 3°C)followed by 4 h condensation at 50 ± 3°C. Another cyclehas been widely used for coatings: UVB 313 lamps (4 hUV at 60 ± 3°C) followed by 4 h condensation at 50 ±3°C.The light source is an important factor in laboratory testsof materials. Besides that the heat and moisture play asignificant role in lhe effect of weather on materialsthrough lheir effect on the secondary reactions followingbond breakage by the absorbed radialion and are animportant component of the laboratory accelerated tests. Agreat benefit of a laboratory simulation is the repeatabilitycompared to what is essentially an uncontrolled andvariable phenomenon, the actual weather. The weatherfactors can be manipulated independently. Thus, manyweather factors that would be impossible to conductoutdoors can be reproduced in specific conditions.
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Term
Summer
Professor
Eric Larson
Tags
Materials Science, Ultraviolet, ASTM

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