Description in English
Fracture toughness tests of steels can yield an important information about the cohesive strength of grain boundaries in case of intergranular fracture mode. Current evaluation methods, however, completely ignore the micro-tortuosity of the crack front.Related shielding effects might substantially reduce the real crack driving force in comparison with the standardly assumed straight crack front.The aim of the project is to develop a methodology for estimation of the shielding level for 2D- and 3D intergranular crack front branches. This correction would enable to reduce the data scatter band and to obtain a more relevant information on the grain boundary properties. Using this method, experimental data obtained from fracture toughness-, stress corosion cracking- and fatigue tests will be evaluated for various (mostly low alloy) steels, An analysis of impurity concentrations at grain boundaries will also be performed.

OC 517.30

Czech

Pokluda Jaroslav, prof. RNDr., CSc. - principal person responsible

Faculty of Mechanical Engineering
- responsible department (1.1.1989 - not assigned)
Faculty of Mechanical Engineering
- beneficiary (1.1.1998 - 31.12.2001)

POKLUDA, J. Tortuous Cracks under Remote Mode I: the Statistical LEFM Approach. Zeszyty naukowe politechniki Opolskiej seria Mechanika, 2001, vol. 67, no. 7, p. 277 ( p.)ISSN: 1429-6055.
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PONÍŽIL, P.; SAXL, I.; DRUCKMÜLLER, M.; POKLUDA, J. Comparison of Real and Simulated Polycrystalline Grain Structures. Kovové materiály, 1998, vol. 36, no. 6, p. 409 ( p.)ISSN: 0023-432X.
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POKLUDA, J., VLACH, B., ŠANDERA, P., JANOVÁ, D., HORNÍKOVÁ, J. Fraktografická podpora interpretace anomálního vztahu lomové a vrubové houževnatosti ultrapevné oceli. In Fractography 2000. Košice: ÚMV SAV, 2000. s. 383 ( s.)ISBN: 80-968468-3-3.
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POKLUDA, J., ŠANDERA, P., HORNÍKOVÁ, J. Statistical Model of Roughness Induced Crack Closure. In Fracture Mechanics: Applications and Challenges, ECF 13. San Sebastian: Elsevier, 2000. p. CD ( p.)
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POKLUDA, J., VLACH, B., ŠANDERA, P., JURÁŠEK, L. Antagonism in Fracture and Notch Toughness of UHSLA Steels. In Charpy Centenary Conference 2001. Les Fontelles: SF2M Les Fontelles, 2001. p. 465 ( p.)
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DOBROVSKÁ, J., DOBROVSKÁ, V., POKLUDA, J., STRÁNSKÝ, K., MANDRINO, D., JENKO, M. Microheterogeneity in the Ultra-High Strength Low Alloy Steel after Three Regimes of Heat-Treatment. In Materials Structure & Micromechanics of Fracture (MSMF-3). Brno: Vutium, 2001. p. 726 ( p.)ISBN: 80-214-1892-3.
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GORDIENKO, Y., ZASIMCHUK, E., POKLUDA, J. Multiscale Correlation Effects during Fatigue Damage Evolution Observed by Surface Roughness Analysis. In Materials Structure & Micromechanics of Fracture (MSMF-3). Brno: Vutium, 2001. p. 180 ( p.)ISBN: 80-214-1892-3.
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ŠANDERA, P., HORNÍKOVÁ, J., POKLUDA, J. Aproximální výpočet stínícího efektu na čele interkrystalické trhliny pomocí pyramidálního modelu. In Křehký lom. Brno: ÚFM AV ČR, 2001. s. 69 ( s.)
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POKLUDA, J., ŠANDERA, P., HORNÍKOVÁ, J. Kvantitativní interpretace závislosti rozkmitu prahových hodnot K-faktoru na střední velikosti zrna ARMCO železa. In Degradácia vlastností konštrukčných materiálov únavou. Žilina: ŽU Žilina, 2001. s. 31 ( s.)ISBN: 80-7100-873-7.
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ŠANDERA, P., POKLUDA, J., HORNÍKOVÁ, J. Pyramidal Model of Intergranular Crack Front. In Materials Structure & Micromechanics of Fracture (MSMF-3). Brno: Vutium, 2001. p. 786 ( p.)ISBN: 80-214-1892-3.
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HORNÍKOVÁ, J., ŠANDERA, P., POKLUDA, J. Effective Stress Intensity Factor for Crack of Intergranular Morphology. In Materials Structure & Micromechanics of Fracture (MSMF-3). Brno: Vutium, 2001. p. 737 ( p.)ISBN: 80-214-1892-3.
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POKLUDA, J., VLACH, B., ŠANDERA, P., JURÁŠEK, L. Contradiction in Fracture- and Notch Toughness of High Purity Low Alloy Steels. In Cleaner Metal for Industrial Exploitation. Řež: Inst. Nuclear Research, 2001. p. 126 ( p.)ISBN: 92-828-8323-X.
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POKLUDA, J., SAXL, I., ŠANDERA, P., PONÍŽIL, P., MATOUŠEK, M., PODRÁBSKÝ, T., HORNÍKOVÁ, J. Real-like Polycrystal with Intergranular Crack. In Euromat 2000. Tours (Francie): Elsevier, 2000. p. 449 ( p.)ISBN: 0-08-042815-0.
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ŠANDERA, P., HORNÍKOVÁ, J., POKLUDA, J. Effective Stress Intensity Factor of a Real-Like 3D Intergranular Crack Front. In ECF 12, Fracture from Defects. UK, Sheffield: Elsevier, 1998. p. 811 ( p.)ISBN: 190153703.
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Responsibility: Pokluda Jaroslav, prof. RNDr., CSc.