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NEW A VERSATILE SYSTEM FOR TENSILE TESTING OF RUBBER O-RINGS
Lloyd Instruments can offer a versatile system for tensile testing of rubber O-rings, featuring a special motorised ring grip in conjunction with a universal materials testing machine such as the 5kN LRXPlus. O-rings are used for fluid and vacuum sealing in a host of industries including automotive and aerospace. The motorised grip can accommodate bands up to 20 mm wide. The grip consists of two anvils mounted on shafts to allow rotation. The lower anvil is driven by a small electric motor and is mounted to the lower anchor pin of the testing machine. The upper anvil is mounted to the loadcell of the testing machine and is free to rotate. The lower anvil speed can be adjusted between 0 and 20 RPM. The O-ring is placed over both anvils and rotated by the electric motor while a tensile load is applied by the testing machine. In this way stress in the sample is equalised through its length. Tensile measurements can be used to monitor the quality and uniformity of O-rings. Three properties are typically measured: the force required to break the O-ring, the percentage elongation before breaking and the tensile breaking strength. Testing can be carried out both before and after immersion of the O-ring in the fluid to which it is providing the seal. This shows how the fluid environment can affect the material's physical properties. The LRXPlus is a single column test instrument that can be used for material testing applications up to 5 kN (1124 lbf). Fast (8 kHz) sampling rates allow detailed measurement and analysis, benefiting research as well as production applications. Special 'creep' and 'relaxation' programmes accompany tensile, compression, flexural and cycling modes to fulfil a wide range of test applications. The addition of Lloyd Instruments’ powerful NEXYGEN MT materials test and data analysis software and Ondio application builder software allows full automation of the tests, collection of data and presentation of results. http://www.lloyd-instruments.co.uk
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