New and Improved Tests for Adhesion.
AKRON UNIV OH INST OF POLYMER SCIENCE
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Three methods are discussed for measuring the work G sub a required to break a bond Outwaters double-torsion test for long plates, bonded together a pull-off test for an elastic strip adhering to a rigid surfaces and a blister test for an adhering elastic layer. The pull-off force F or blow-off pressure P is given by F4or P4 is directly proportional to KG sub a cubed where is the tensile stiffness of the detaching layer. This unusual dependence arises from the non-linear cubic relation between force or pressure and pull-off angle theta or blister height y. However, the products F theta and Py give direct measures of G sub a, independent of stiffness and the extent of detachment. Keywords Adhesion, Blister test, Detachment, Elasticity, Fracture energy, Fracture mechanics, Non-linear elastic behavior, Pressure, Pull-off, Torsion.