These extensometers are used for direct extension measurement in tensile tests, flexure tests, and alternating load tests. They all possess a large measurement range featuring stepless adjustment to suit the specimen being tested. Clip-on extensometers and extensometers with sensor arms are in direct mechanical contact with the specimen via knife edges positioned at right angles to the gage length.
The demands placed on extensometers vary as widely as the applications for which they are used. The criteria used to determine the most suitable extensometer for a given application or range of applications are also highly varied. The principal factors determining extension measurement requirements are the properties of the material to be tested, the specimen shape and dimensions, and the test standards that have to be complied with (for example, ISO 6892, ISO 527, ISO 10113 etc.). Among other things they define the test sequence, the characteristics to be determined, and with what accuracy, and the environmental conditions, such as the test temperature.
ZwickRoell has a comprehensive selection of extensometers, ranging from an analog clip-on instrument to the fully automatic universal extensometer. ZwickRoell extensometers are designed with the operator in mind. They should be as simple as possible to clamp on the specimen and to operate. Our many years of experience in developing and designing extensometers, manufacturing the instruments in-house from start to finish and performing a wide variety of installations are your guarantee of state-of-the-art extensometry. ZwickRoell’s innovations have placed the company at the cutting edge in many areas.
The crucial advantage of extensometers featuring non-contact measurement is that they can be used right up to break without risk of damage, even with specimens which are critical in this respect.