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Incubation time being the main characteristic parameter for dynamic fracture
process is experimentally measured for PMMA utilizing optical methods. The specimen is
quasistatically loaded in standard tensile testing machine until brittle fracture occurs when the
sample is split into two parts. Normally this splitting of brittle materials is accompanied by
the impact unloading of the sample. In considered tests tensioned samples were dynamically
unloaded by stress drop wave, generated by fracture process and registered by photoelasticity
technique at a certain distance from breaking line. The same experiment is simulated using
ANSYS FEM software package and the incubation time is evaluated numerically. The
simulation results are in a good coincidence with experimental measurements, proving the
applicability of the proposed simple method for brittle fracture incubation time measurements.
Keywords: dynamic fracture process; fracture incubation time; quasistatic tensile strength experiment |
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