Abstract: A novel method for determining a coefficient of moisture expansion of a single, identified workpiece or coupon. The method includes the steps of positioning the workpiece in a chamber having known environmental parameters; determining a workpiece length change .DELTA.L caused by a chamber induced change in the workpiece moisture content .DELTA.M, by positioning first and second transformers to opposite ends of the single workpiece; and, measuring a chamber induced change in the workpiece moisture content .DELTA.M, by weighing the workpiece.

Abstract: An assembly for determining a coefficient of moisture expansion of a single, identified workpiece or coupon. The assembly includes means for positioning the workpiece in a chamber having known environmental parameters; means for determining a workpiece length change, .DELTA.L caused by a chamber induced change in the workpiece's moisture content .DELTA.M; and, means for measuring a chamber-induced change in the workpiece's moisture content .DELTA.M.

Abstract: An assembly and method suitable for determining the coefficient of thermal expansion (CTE) of a workpiece. The assembly includes a dual channel laser interferometer system placed in operative association with the workpiece, and a vacuum, heating and cooling chamber surrounding the workpiece. The assembly is particularly useful for determining the CTE of a workpiece having a relatively low value, e.g., a CTE less than 0.1.times.10.sup.-6 inch/inch .degree.F. It is therefore advantageously employed for determining the CTE of a workpiece comprising a composite, like a graphite/epoxy composite, that may have a CTE in the range of .+-.0.2.times.10.sup.-6 inch/inch .degree.F.

Abstract: An improved dilatometer suitable for testing the coefficient of thermal expansion (CTE) of a workpiece. The workpiece having a CTE in the range of -0.2.times.10.sup.-6 inch/inch .degree.F. to 0.2.times.10.sup.-6 inch/inch/.degree.F. The improvement includes a reference structure means for positioning and isolating the workpiece, and for maintaining an independent reference temperature, uninfluenced by a required workpiece temperature differential. The temperature independent reference structure means helps assure that measurements of expansions/contractions of the workpiece, as a function of temperature, are uniquely that of the workpiece, and not that of the reference structure means, or any other ambient temperature determinant. The improved dilatometer is particularly useful for determining the CTE of a workpiece having a relatively low value, e.g., a CTE less than 0.1.times.10.sup.-6 inch/inch .degree.F.