Scissor Grips
Scissor Grips are a type of self-tightening fixture used for tensile testing. These grips are ideal for wider/thicker samples of bone, elastomers, foam, plastics, or wood. The Scissor Grip uses a spring to create tension and drive the jaw clamps together. This tensile grip is often chosen because it can open much wider than self-tightening roller grips or wedge grips.
The spring tension force is highest when the grip is wide open and smallest when the grip is almost closed.
As the test progresses, the grip maintains a positive lateral force on the sample which prevents slippage. Scissor fixtures work best for samples that are somewhat soft and have a good degree of thickness, usually above 10mm or 1/2 of an inch. If the specimen has a tendency to thin out and slip from a vise grip, then scissor grips are a great solution.
Other grips that provide positive lateral tension for wider samples include the Pneumatic Grips.
