Extensometers for material testing machines - Zwick - #2

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2 Table of contents 1. The Zwick Roell Group – more than a century of experience in materials testing .............................................. 2 2. Extensometers – a core area of Zwick expertise ............................................................................................. 3 3. Choosing the right extensometer for every materials testing application ............................................................ 4 4. Direct and indirect extension measurement..................................................................................................... 8 5. Relevant material properties ........................................................................................................................... 9 5.1 Extension measurement ........................................................................................................................... 9 5.2 Transverse strain measurement ...............................................................................................................10 6. Selection criteria ..........................................................................................................................................10 7. Overview of Zwick extension measurement systems ......................................................................................12 8. Contact measuring systems ..........................................................................................................................13 8.1 Sensor arm extensometers .....................................................................................................................13 8.2 Clip-on extensometers ............................................................................................................................17 9. Non-contact measuring systems ...................................................................................................................19 9.1 videoXtens .............................................................................................................................................20 9.2 laserXtens ..............................................................................................................................................21 9.3 lightXtens ...............................................................................................................................................22 9.4 optiXtens................................................................................................................................................23 1. The Zwick Roell Group – More than a Century of Experience in Materials Testing Mechanical-technological testing is one of the oldest disciplines of materials testing. As early as in the 15th and 16th century, Leonardo da Vinci and Galileo Galilei were already considering the flexural stressing and elastic behaviour of materials. In the course of time further knowledge was obtained. In the middle of the 18th century the first testing machines finally appeared in France. Since 1920 the company Roell & Korthaus was involved in the materials testing business. In 1937 Zwick built its first testing machines and systems for mechanical testing of materials, and many years prior to that in 1876, a Professor Seger had founded a chemical laboratory as part of a scientific technological consulting company for non-metallic materials. During the 20th century the present company, Toni Technik, has evolved from these origins and is now considered a leading expert in test systems for building materials. MFL (Mohr & Federhaff) – a company that was founded in 1870 – became part of the Zwick Roell group and interestingly, Carl Benz (of Mercedes Benz fame) was one of their employees. Headquarters of the Zwick Roell AG and the Zwick GmbH & Co. KG in Ulm