Abstract
This paper presents the results of experimental tests on PMMA plane specimens during compression loading and unloading. Notched specimens were used. They were weakened by various edge-notches: sharp V-notch (notch radius is close to zero), rounded V-notch (notch radius is approximately 1 mm) and U-notch with radius equal to 10 mm. Specimens had two thicknesses: 9.7 and 14.5 mm. All of the deformations and fracture processes were recorded by a high-speed PHANTOM camera, which was synchronized with an MTS testing machine. Device synchronization enabled the estimation of the fracture initiation point and time moment. Depends on shape of the notch, various fracture initiation points were indicated. Critical load values were obtained. Two types of crack were observed. Causes and fracture initiation moments were diagnosed. The first crack appears during loading stage as a result of contact stress caused by the closing notch surfaces (crack type A). The second one was caused by residual stress generated during the unloading stage (crack type B). Fracture evolution processes for each notch type were described.
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