Prevención ar anti-grietas ne ar avalancha

Abstract

Anticrack ge 'nar dets'e falla pendiente caracterizada ya nucleación ne ar propagación carga cizallamiento, fracturas modo mixto da deslaminan ar capa débil dige 'nar área nt'ot'e ho 'bui ndunthe ya. ar onda colapso hingi lineal resultante to da t'ot'e hogu'mui ar avalancha ne ar disparo. jar xeni Nthuts'i calculamos jar dätä hnini perturbación ar tensión generada ja 'nar simple, modelo Anticrack. Mostramos da genera 'nar onda cizallamiento ko 'nar amplitud bi jagu̲ju̲ ya ndu nzafi ar capa débil ne ar tsa̲ da interpretar jar ngäts'i 'nar concentrador tensión Griffith. nuna ar concentración ar tensión produce fracturas en — escalon, similares ja ya observadas jar hwähi. Mostramos da gi fracturas jar echelon contribuyen jar dätä escala ar deformación ar onda colapso ne ar aumento consiguiente jar energía cinética avalancha.

In models in which brittle fracture is assumed, a crack is characterised by a single size parameter, the radius or half-length of the crack, and a unique characteristic mechanical energy, called the crack energy V(r). In addition to the stress applied to the crack, this energy is also dependent on cohesion, geometry, applied strain and any material defects (e.g. pores).

In a continuum description of the stress field in the weak layer the mechanical energy of an Anticrack can be divided into a contribution proportional to t2 and a portion that is proportional to s2. We use a two-dimensional BEM code to calculate the state of stress induced by a model Anticrack CB, and compare it with the normal stresses obtained with the Eshelby approach. Near the Anticrack tip the Anticrack solution is very close to the Eshelby solution, but for any distance beyond this point the mismatch drops to less than 1%.