The description of DS at the sub-ppm level will require new terminology. Hysteresis on thermal cycling is a major variable in the DS description of materials at the ppm and sub-ppm level. In addition, CTE is not a very useful tool in the description of dimensional stability at the sub-ppm level. Materials with zero quasi-static CTE behave as if they had a CTE of several ppm/K when the thermal gradients are present. Thermal fluctuations limit the ultimate DS of all materials. Two phase 'zero CTE' materials have additional severe limitations on the ultimate CTE. In non-equilibrium conditions 'zero CTE' materials behave as if they had the CTE nearly equal to double the CTE of the stiffest phase.
Theoretical limits of dimensional stability for space structures
Theoretische Grenzen der Dimensionsstabilität für Weltraumstrukturen
1991
11 Seiten, 4 Tabellen, 4 Quellen
Conference paper
English
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