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Titolo:
Microcrack nucleation and growth in elastic lamellar solids
Autore:
Arata, JJM; Needleman, A; Kumar, KS; Curtin, WA;
Indirizzi:
Brown Univ, Div Engn, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 iv, Div Engn, Providence, RI 02912 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF FRACTURE
fascicolo: 4, volume: 105, anno: 2000,
pagine: 321 - 342
SICI:
0376-9429(200010)105:4<321:MNAGIE>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
DYNAMIC CRACK-GROWTH; NUMERICAL SIMULATIONS; TITANIUM ALUMINIDE; VOID NUCLEATION; TIAL-ALLOY; BETA-PHASE; FRACTURE; TOUGHNESS; PLASTICITY; INTERFACE;
Keywords:
microlaminate fracture; lamellar solids;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Arata, JJM Brown Univ, Div Engn, Providence, RI 02912 USA Brown Univ Providence RI USA 02912 n, Providence, RI 02912 USA
Citazione:
J.J.M. Arata et al., "Microcrack nucleation and growth in elastic lamellar solids", INT J FRACT, 105(4), 2000, pp. 321-342

Abstract

The nucleation and growth of microcracks in elastic lamellar microstructures is studied numerically. The analyses are carried out within a framework where the continuum is characterized by two constitutive relations: one relating the stress and strain in the bulk material and the other relating thetraction and separation across a specified set of cohesive surfaces. In such a framework, fracture initiation and crack growth, including micro-cracknucleation ahead of the main crack, arise naturally as a consequence of the imposed loading, without any additional assumptions concerning criteria for crack growth, crack path selection or micro-crack nucleation. Full transient analyses are carried out and plane strain conditions are assumed. The specific problem analyzed is a compact tension specimen with two regions ofdiffering lamellar orientation separated by a fracture resistant layer of finite width d, which is small compared to the physical dimensions of the specimen. An initial crack, normal to the applied loading, is assumed to exist in the first region whose lamellar orientation is fixed. The lamellar orientation of the second region, beta, is varied, as is the thickness of thefracture resistant layer. It is found that microcrack nucleation in the second region is highly sensitive to the lamellar orientation in that region for small values of d. However, microcrack nucleation becomes rather insensitive to beta with increasing d. It is also shown that a linear elastic fracture mechanics model with one adjustable parameter gives good agreement with the numerical results for fracture initiation.

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Documento generato il 21/09/20 alle ore 12:12:55