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Projects / Programmes source: ARIS

A Unification Approach to Fracture of Homogeneous and Functionally Graded Materials

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Research activity

Code Science Field Subfield
2.11.00  Engineering sciences and technologies  Mechanical design   

Code Science Field
P170  Natural sciences and mathematics  Computer science, numerical analysis, systems, control 
Keywords
Functionally graded materials, ferritic steels, fracture in ductile-brittle transition, Weibull stress, coupled Beremin-Gurson model, numerical simulations, experimental research, laser welded joints;
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (2)
no. Code Name and surname Research area Role Period No. of publications
1.  21380  PhD Boštjan Bezenšek  Mechanical design  Researcher  2004 - 2006  26 
2.  03014  PhD Jože Flašker  Mechanical design  Head  2004 - 2006  784 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0795  University ob Maribor, Faculty of mechanical engineering  Maribor  5089638010  23,917 
Abstract
Functionally graded materials present viable new material alternatives, subject to appropriate characterisation of resistance against fracture. In the proposed project the framework for fracture of functionally graded materials in the ductile-brittle transition shall be developed. The weakest link statistics shall be used and Beremin's Weibull stress model extended to model stress controlled fracture of functionally graded materials. Crack initiation from a static field of a pre-crack and after incremental crack growth by ductile tearing shall be modelled. The significance of plastic strains on the cleavage fracture in graded materials highlighted by Bezensek (2003) shall be examined by empirical functions of strain dependent crack initiation distributions and by a coupled Gurson-Weibull model, that would allow for the effects of plasticity to be quantified and incorporated in models of stress controlled fracture. The procedure will introduce gradients in strength and toughness of the material in the coupled model, allowing accurate examination of near tip fields ahead of cracks and notches for stress and strain controlled fracture processes. The procedure shall be verified on custom made fracture mechanics specimens containing controlled strength and toughness gradients. With such knowledge the fracture of functionally graded materials in the ductile-brittle transition will be more accurately modelled and unification procedures developed. Such procedures would allow fracture data obtained using Charpy and fracture mechanics testing procedures to be unified into a common fracture locus, for homogeneous and functionally graded materials.
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