Abstract
Abstract This paper presents an alternative method to measure the torsion modulus, G, for samples of polymers. We constructed a measurement system with a force sensor (FS) and a rotational movement sensor (RMS) to obtain a relationship between force (F) and torsion angle (θ). An expression that could return the value of G was deduced using the deformation energy method. This technique is nondestructive and independent of knowing the value of Poisson’s ratio. Samples with different diameters of polytetrafluoroethylene (PTFE) were submitted to quasi-static torsion at the same aspect ratio. The aim was to present and validate the use of the technique for a known polymer. The approximate value of 350 MPa of the torsion modulus G was found for PTFE samples. As the values obtained are within the limits found in the literature, the technique can be used to study samples of polymers and other materials.
Highlights
In order to predict the behavior of materials when technique can be used to measure G in polymeric materials.subjected to stresses or loads, it is necessary to know their this technique showed some limitations regarding characteristics, such as rigidity
We have chosen the polymer we developed an apparatus that is fixed to the polytetrafluoroethylene (PTFE), a well-known fluoropolymer, same torsion pendulum used in the dynamic measure[12] and to validate the use of the technique
Circular cross-sections of PTFE samples showing a decrease in strength, and Kletschkowski et al.[8] with different diameters are subject to a quasi-static torsion explored the elastic behavior of filled PTFE to develop models for seal materials
Summary
In order to predict the behavior of materials when technique can be used to measure G in polymeric materials.subjected to stresses or loads, it is necessary to know their this technique showed some limitations regarding characteristics, such as rigidity (elastic modulus). We have chosen the polymer we developed an apparatus that is fixed to the polytetrafluoroethylene (PTFE), a well-known fluoropolymer, same torsion pendulum used in the dynamic measure[12] and to validate the use of the technique. The properties of this which will be used as a means to overcome the limitations polymer make it suitable for use in aerospace applications[1] related to the dynamic method. Circular cross-sections of PTFE samples showing a decrease in strength, and Kletschkowski et al.[8] with different diameters are subject to a quasi-static torsion explored the elastic behavior of filled PTFE to develop models for seal materials. Rae and Brown[9] found that some grades of PTFE are sensitive to strain-rate, temperature, and crystallinity under tension
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