| 内容提要（EN）： |
A micrometer with a 4 to 7 mm [0.16 to 0.28 in.] nominal diameter ball-interface or a flat anvil interface shall be used to measure the specimen thickness. A ball interface is recommended for thickness measurements when facings are bonded to the core and at least one surface is irregular (e.g., the bag-side of a thin facing laminate that is neither smooth nor flat). A micrometer or caliper with a flat anvil interface is recommended for thickness measurements when facings are bonded to the core and both surfaces are smooth (e.g., tooled surfaces). A micrometer or caliper with a flat anvil interface shall be used for measuring length and width, as well as the specimen thickness when no facings are present. The use of alternative measurement devices is permitted if specified (or agreed to) by the test requestor and reported by the testing laboratory. The accuracy of the instruments shall be suitable for reading to within 1&x2009;%of the sample dimensions. For typical specimen geometries, an instrument with an accuracy of &xb1;&x2009;0.025 mm [&xb1;0.001 in.] is adequate for the length, width, and thickness measurements.; bending stress; core modulus; core stress; facing stress; sandwich construction; sandwich deflection; shear stress; |
