Abstract
Cyclic constant displacement tests on CT (compact tension) specimens, according to the ASTM E647-00 standard, have been carried out in order to investigate the crack initiation and propagation for two polymeric materials: the ABS (Acrylonitrile Butadiene Styrene) and PMMA (Polymethyl methacrylate). Experimental cyclic tests have been performed on a self-designed and constructed machine working under constant displacement at frequency of 0.25 Hz and with maximum displacement of 390 μm. The displacement control is implemented using the Arduino software, a personal computer together with an inductive proximity sensor, which allows determining the displacement with ±4 μm of precision. The stress intensity factor in mode I (KI), is obtained for different crack lengths “a”, different amplitudes of displacement, for the two polymeric materials. In addition, the energy release rate G for plane stress and plane strain are obtained by using the stress intensity factors in mode I, previously calculated. Finally, the fracture surfaces are analyzed by scanning electron microscope in order to examine the general trends for crack initiation and propagation under the loading conditions being described.
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