Method for analyzing thermal deformation
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United States of America Patent
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Sep 23, 2003
Grant Date -
Mar 20, 2003
app pub date -
Aug 31, 2001
filing date -
Nov 29, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to precisely analyze thermal deformation of a substance which thermally shrinks over time, the amount of deformation of a substance is determined by separate steps of calculation of elasto-plastic deformation during temperature increase (step S12); calculation of creep deformation from the time when the temperature increase is completed till the time when the temperature decrease is started (step S14); and calculation of elasto-plastic deformation during the temperature decrease (step S16). When calculating the creep deformation, it is assumed that deformation due to the thermal shrinkage of the substance over time occurs simultaneous with the creep deformation, and strain rate is calculated as the time derivative of the total strain which is the sum of creep strain and the strain produced by thermal shrinkage. The creep deformation is then calculated by integrating the strain rate over the time from when the temperature increase is completed until the time when the temperature decrease is started.
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