A numerical analysis of crack growth in microcracking brittle solids
Journal Article
·
· Acta Metallurgica et Materialia; (United States)
- Ames Lab., IA (United States)
In this study a set of numerical analyses of crack growth was performed to elucidate the influence of microcracking on the observed fracture behavior of brittle solids and composites. The random nucleation, orientation and size effects of discrete microcracks and resulting interactions are fully accounted for in a hybrid finite element model. The results indicate that for development of R-curve behavior, the formation of a wake region is necessary. The near-field microcracks are not the sole dominating factor in the development of the R-curve behavior, their interactions can be strongly amplified or mitigated by the far-field cracks. Therefore, the microcrack zone width as well as microcrack density plays an important role in toughening behavior. The continuum description of microcracking can provide a reasonable estimation of shielding; however, it fails to distinguish the effects of microcrack length and the role of the wake region during the crack extension.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 7184370
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:11; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
BRITTLENESS
CRACK PROPAGATION
FRACTURE PROPERTIES
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
STRESS INTENSITY FACTORS
360103* -- Metals & Alloys-- Mechanical Properties
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
BRITTLENESS
CRACK PROPAGATION
FRACTURE PROPERTIES
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
STRESS INTENSITY FACTORS