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>EMPIRICAL EVALUATION OF THERMAL CONTACT RESISTANCE OF BOLTED JOINT CONFIGURATIONS FITTED WITH VARIOUS INTERFACE MATERIALS UNDER VACUUM CONDITIONS
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EMPIRICAL EVALUATION OF THERMAL CONTACT RESISTANCE OF BOLTED JOINT CONFIGURATIONS FITTED WITH VARIOUS INTERFACE MATERIALS UNDER VACUUM CONDITIONS
This paper presents the results of the experiments conducted with two different test setups, representing the orthodox configurations of bolted joints and structural geometries in wide usage for space applications, to evaluate the thermal contact resistance across abovementioned joints when fitted with various polymeric gaskets and RTV silicone compounds and subjected to heat flux in vacuum conditions. The test subjects include a special bolt and washer configuration frequently employed in spacecraft designs and not studied comprehensively hitherto, in the form of two Al-6065 and Al-7071 specimen bolted together with interface materials between the two aluminum sheets and flat and spring washers inserted between the bolt heads and the upper plate and nuts and the bottom plate. The mentioned assembly is sandwiched between a copper and an aluminum slab, on the top of which the heater is installed. The whole configuration is covered with a MLI blanket and is attached to the base plate of a thermally conditioned vacuum chamber. The second test subject represents a more complex geometry comprising a hollow aluminum box with a hatch connected to the top of the box, and another aluminum plate to which the bottom of the box is jointed. The lower aluminum plate is in turn connected to an aluminum slab and thermal filler materials are inserted between the interface of the aluminum plate and the slab. An electrical heater is mounted on the top of the box and again, the whole setup is installed in the vacuum chamber. The effects of filler parameters like thickness on thermal contact resistance are studied and the results are discussed. These series of tests are designed to facilitate selection of the best performing-value for money- thermal fillers in these specific configurations for thermal control engineers in practical cases.
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