Jännityskriteeri
Jännityskriteeri is a concept used in engineering and materials science to predict when a material will fracture under stress. It is a criterion that defines the conditions under which failure will occur, based on the stress state at a crack tip. Unlike simpler yield criteria that predict the onset of plastic deformation, jännityskriteeri focuses on the catastrophic brittle or ductile fracture of a material.
There are several types of jännityskriteeri, each with its own approach to modeling fracture. One common approach
More advanced criteria consider the influence of plasticity around the crack tip. These may involve parameters