Criterion for predicting direction of the crack in composites with random structure
Referat wygłoszony
| Status: | |
| Autorzy: | Podgórski Jerzy |
| Rok wydania: | 2012 |
| Język: | angielski |
| Źródło: | ECCOMAS European Congress on Computational Methods in Applied Science and Engineering, 10-14.09.2012 r., Wiedeń, Austria |
| Państwo wystąpienia: | POLSKA |
| Efekt badań statutowych | NIE |
| Abstrakty: | angielski |
| Paper contains results of fracture analysis of brittle composite materials with a random distribution of grains like concrete or other geo-materials. The composite material has been modeled as an isotropic matrix that surrounds circular grains with random diameters and space position. Analyses were preformed for the rectangular finite element models. Fracture analyses were accomplished with the authors' computer program CrackPath3 executing the "fine mesh window" technique. Calculations were preformed in 2D space assuming the plane stress state. Current efforts focus on brittle geo-materials such as rocks or concrete. The CrackPath3 program calculates the stress field using finite elements methods and then it seeks the point of the crack initiation on the basis of the author (PJ) criterion.This is the point of the highest value of the material effort (m). The the crack is assumed to continue in direction of highest value of the m ratio. The value of the material effort ratio m is calculated based on the formula containing stress tensor components and material constants according to the PJ failure criterion: m = r(s)/ro(s), where r and ro are radii in the stress space. |
