Microstresses

Microstresses

 

internal stresses that arise in crystals in the absence of external forces and are equilibrated within volumes that are small compared to that of the entire body. They are caused by imperfections of the crystal structure, such as point defects and clusters of them, and also dislocations. With decreasing distance from a defect, the stresses in the crystal increase and may reach values of the order of the ultimate strength of the material. Microstresses determine a number of the physical properties of crystals, above all the mechanism of their plastic deformation and failure.

References in periodicals archive ?
As reported, at room temperature, the residual microstresses generate nonuniform strains (distortions) in the molecular structure and cause broadening of the diffraction peaks thus hiding the relatively sharp lines that would normally be generated by the crystalline regions [32].
The efficiency of nitriding depends on many interconnected factors such as technology, composition of steel, level of residual macro and microstresses, hardness, depth and structural composition of nitrided layer.
5] is based on the hypothesis that microstresses are distributed by the normal law while fracture occurs when critical probability of exceeding by microstresses responsible for fracture is reached.
Microstresses in the random point of nonuniform micro-sized medium with elastic deformation can be found as the sum:
11]> is covariances (correlation moments) of microstresses caused by single macrostresses [[bar.
For every kind of extension six components of microstresses [bar.