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equilibrium, and are of such type or geometry that the weight change ofthe material cannot be properly measured by weighing the specimen itself(such as a tabbed mechanical coupon), then use another traveler coupon ofthe same nominal thickness and appropriate size (but without tabs) todetermine when equilibrium has been reached for the specimens beingconditioned.8.2 Geometry—Design of mechanical test coupons, especiallythose using end tabs, remains to a large extent an artrather than a science, with no industry consensus on how toapproach the engineering of the gripping interface. Each majorcomposite testing laboratory has developed gripping methodsfor the specific material systems and environments commonlyencountered within that laboratory. Comparison of these methodsshows them to differ widely, making it extremely difficultto recommend a universally useful approach or set of approaches.Because of this difficulty, definition of the geometryof the test coupon is broken down into the following threelevels, which are discussed further in each appropriate section:
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