Non-linear elastic metal polycrystals mechanics

Supposition on nonlinear distribution of elastic stresses over crystal bulk, subgrain, grain, sample volume is made, nonbinear elastisity mechanics is proposed according to which six types of elastic stresses (σph.s., σph.grain σph. - physical limits of the sample, grain, block elastisity, σc-contact stress of defect interaction, σPN -Peierls-Nabarro stress and 2Qm-atomic displacement stress) characterize stressed state during material loading. Mechanics of nonlinear-elastic metal polycrystals presents physical fundamentals to explain causes of forming dislocations, slip lines, fragmentation appearance and initiation of fragment rotations near the sample surface and grain boundaries