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| When certain viscoelastic samples are sheared, a force normal to the plane of the applied shear is produced, this is called the normal force (or normal stress if the correct geometry factors are considered). The most obvious display of normal force is the rod-climbing phenomenon more commonly referred to as the Weissenberg effect. When a rotating rod is dipped into a shallow vessel containing an elastic liquid the liquid actually climbs the rod whereas a Newtonian liquid would be forced outwards by inertia. |
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