突然想到一个问题，关于热膨胀系数的
做热应力分析这么久，今天才发现一个问题，ANSYS上的热膨胀系数APLX的定义到底是什么？是瞬时热膨胀系数即膨胀曲线在此温度时的斜率，还是从参考温度到此温度上的膨胀率的累加呢？查了几本书，居然还都没有提及热膨胀系数的具体定义。ANSYS帮助文件也没有提及。请知情者不吝赐教 找到定义了，看来应该是膨胀曲线的斜率：
By definition, thermal strain at temperature T is the change in length of a member, due to a change in temperature, ( T - Tref ), divided by the original length l of that member. Denoting thermal strain at temperature T as eT
http://femci.gsfc.nasa.gov/cte/eqn01.gif (1).The thermal strain is zero at the reference temperature, Tref .
Also, by definition, the coefficient of thermal expansion (CTE or http://femci.gsfc.nasa.gov/cte/alpha.gif) at temperature T is is defined as
http://femci.gsfc.nasa.gov/cte/eqn02.gif (2). 把作者的另一个帖子转过来大家看看
http://forum.vibunion.com/forum/thread-51134-1-1.html
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