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When Quartz Tubes Start to Melt, or, Why the CVD Furnace Was Down for Four Weeks: Problem 29


Overview.
  This post is a description of the project Sunny Wicks and I will be pursuing for this class, to satisfy the requirements for Problem 29.


Description.
  We'd like to model our tube furnace in ABAQUS, in particular a spectacular incident involving an unexpected temperature jump that induced viscoelastic/plastic deformation of a fused quartz tube. This will involve a comparison of hand calculations of simplified models, ABAQUS results for the viscoelastic deformation, and the actual "experimental" results. We hope to explore the mechanisms of time- and temperature-dependent viscoelastic deformation in the tube under loads on its ends as well as the issues related to representing viscoelastic deformation and temperature variantions in modeling software.  With the actual deformed quartz tube and recorded temperature data versus time, we can check the accuracy of several complexities of representations, varying from a simple cantilever beam under point and thermal loads to a more detailed model and temperature profile in ABAQUS.

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