FIELD: testing technology. SUBSTANCE: specimen made of sheet composition material under test is coupled to specimen manufactured of nonhumidified and nonoxidized material, for example of stainless steel without shifting of specimens relative to each other. Then composite specimen is saturated with moisture. Uniformity of volumetric saturation of composite sample with moisture is checked by periodical weighing. Variation of curvature of longitudinal axis of specimen uniformly saturated with moisture is measured, and coefficient of composition material humidity expansion is determined by moisture-content and longitudinal axis curvature variation. EFFECT: higher accuracy of determination of humidity expansion coefficient, reduced expenses for preparation and performance of tests. 2 cl, 1 dwg
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