HYGROTHERMAL STRESS OF CLAY IN A HIGH-SPEED DRYING FURNACE
作者:
Kazuhiro Kishidaira,
Kazumi Watanabe,
期刊:
Journal of Thermal Stresses
(Taylor Available online 1996)
卷期:
Volume 19,
issue 7
页码: 599-612
ISSN:0149-5739
年代: 1996
DOI:10.1080/01495739608946197
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Hydrothermal stresses in a clay put in a high-speed drying furnace are discussed. This practical clay is treated as a hygrothermal elastic material that has a simple shape of an infinite body with a bored cylindrical hole. Thus, a theory of hygrothermoelasticity with uneven distributions of temperature and moisture concentration is used to find a closed-form hygrothermal hoop stress in such a body and to illustrate the solution graphically. For a clay put into a high-speed drying furnace, the effects of thermal expansion and drying contraction on the clay cracking are discussed in detail. In particular, it is shown that the effect of thermal expansion on cracking is much smaller (only a few percent) than that of drying contraction, even at high temperatures. As a result, the clay cracking under practical drying conditions would be caused by a drying stress concentration.
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