Determination of the elastic modulii of thin, dry-bearing liners by ball indentations

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Abstract
The elastic moduli of polymer-based composite materials can be conveniently derived from measurements of the elastic recovery of ball indentations following removal of the load. For the thin layer, dry-bearing liners widely used in aerospace applications, classical elasticity theory is invalid but modified analyses are available which take into account the effect of the substrate material. These modified analyses are verified experimentally and it is shown that the greatest source of uncertainty arises from the lack of information about Poisson's ratio. For one composite bearing liner it has proved possible to relate the variations in modulus with thickness to the structure of the fabric reinforcement,