基本信息
摘要：849,624. Testing physical qualities of materials. AVIATION, MINISTER OF, [formerly MINISTER OF SUPPLY]. May 14, 1957 [Feb. 16, 1956], No. 4844/56. Drawings to Specification. Class 106 (2). A method of testing the mechanical properties of materials comprises applying mechanically produced strains to the material under test through a deformable substrate to which the test material adheres throughout an area. The materials to be tested may include pastes, powders, polymer films and vacuum deposited films of metals. It is stated that the method may be applicable to a study of solid friction, of boundary lubrication, or of dilatant systems. Suitable substrates are formed from sheets of rubber, which may be arranged in the form of a cross, a disc, or an ellipse. Various methods are described by which tensional and shear forces may be applied to such members. It is also suggested that a partially inflated balloon might be used in certain circumstances. Other materials may also be used to form the substrate, such as a film of cellulose acetate, or a ductile metal, this being used for testing a thin film of brittle metal. For best results the test material should be sandwiched between two parallel substrates, in which case the mechanical actions imposed are more nearly homogeneous.
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