Abstract
The experimental work on embryonic fracture cracks in polymers recently carried out in the A. F. Ioffe Physico-Technical Institute, Academy of Sciences of the USSR, is reviewed. The cracks have been studied by diffraction methods, chiefly by small-angle x-ray scattering. A principal result of this research is the possibility of formulating the general principle of a micromechanics of polymer fracture. The theory is based on data on the behavior of submicrocracks in polymers (size, concentration), the structural conditions and molecular mechanism of crack formation, the enlargement of submicrocracks, their influence on microcrack formation, and the growth of the macrocracks.
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