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Minimizing bending strain in tension tests has become increasingly important over the last few years with the advent of testing very brittle materials such as ceramics. There are many different ways to minimize bending strain m a tension test, but the most popular method is to allow the grip ends to move freely, or float.
This paper discusses a new tensile grip that uses a captive volume of oil to support the tensile load applied to the specimen. The portion of the grip that is attached to the specimen is allowed to float on a captive volume of oil so that very little bending moment is applied to the specimen. Other factors that contribute to bending stress are discussed in relation to achieving a tension test with a minimum of bending strain.
Data is presented showing the capability of the grip. This data has been manipulated to differentiate between the bending strain caused by the grip versus the bending strain caused by eccentricities within the test specimen. The results are shown as percent bending strain of axial strain versus axial load.
This paper discusses the function, logistics of use, and experimental test results of this new tensile grip. The results show that this grip is capable of producing accurate test results with even very brittle materials.
composite materials, thermal properties, mechanical properties, tensile grip, bending strain, self-alignment, percent bending, alignment fixture
Product engineer, MTS Systems Corporation, Eden Prairie, MN