Tensile Tests on Ropes According to EN ISO 2307
Rope testing requires a certain amount of expertise. Untwisting of the rope on clamping should be avoided as far as possible or kept to a minimum.
The specimen is inserted ergonomically, quickly, and carefully via a winding principle. Specimen material is clamped only on the ends making this principle ideal for very sensitive surfaces. The specimen is automatically centered via a centering ring and the tensile stress on the specimen is reduced by the frictional contact on the load reduction roller. End clamping takes place mechanically via a screw (possibly with increased force), a wedge, or a hydraulic clamping element.
Applying gage marks to the surface of braided or twisted specimens can also be tricky. In view of the energy released when the rope breaks, a non-contact-measuring optical long-travel measuring system is essential because the crosshead travel reference value for the strain cannot be precisely defined. Zwick’s range of capstan grips and rope grips, together with a non-contact long-travel measuring system, provide the ideal solution.