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Operational tests spend for the purpose of definition of conformity of a product to service conditions. The following concerns this group of tests: definition of rigidity of the design-indicator, characterising ability of a design to resist to deformation; definition of effort of transformation - an indicator defining size of effort, necessary for transformation of products; definition of stability to overturning - an indicator characterising ability of a design to keep steady (horizontal or vertical) position under the influence of loading; softness definition - an indicator characterising ability of a material or a soft element is easy to be compressed under loading, gradually increasing resistance to a system equilibrium state ' loading - a material '.
Comparison of the received results of tests to the standard allows to estimate objectively degree of conformity of a design to operational requirements.
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