SELF-TIGHTENING/THIN FILM GRIPS

Self-tightening grips are primarily designed for precision testing of elastomeric and other flexible materials exhibiting a large reduction in cross-section area under load. They provide excellent testing accuracy, positive non-slip gripping action, and are quick and simple to use.

Principle of Operation

The self-tightening grip uses a serrated eccentric roller-type clamping action. The one-lever action reduces the time required to load specimens. Specimen insertion is extremely easy, and the spring pressure of the roller provides a positive non-slip action gripping force. This force is sufficient to hold the material until a load is applied. The follow-up action of the roller while under test prevents the specimen from creeping out of the grip as the load increases.

Special thin film grips use smooth and rubber coated wire capstans to provide a quick and highly efficient grip for testing thin film materials.

Application Range

• Type of loading: Tensile, static, tension cyclic tests. Not suitable for high-cycle fatigue tests.

• Specimen material: Thin sheets, films, flexible plastic and elastomers.

• Specimen shapes: Flat specimen with or without shoulder tab ends.

Safety Advice

Review safety note on page 234