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Local approach and FEM in brittle fracture prediction

100%

Kozák V. , Dlouhý I.

Computer Assisted Mechanics and Engineering Sciences

1998

tom Vol. 5, nr 2

193-198

Local approach in fracture mechanics is based on the application of appropriate failure micromechanistic models to make predictions of fracture behaviour. The FEA of crack-tip and an associated post-processing routine is usually applied. Here should be noted the distinction between the cells of material, having characteristic microstructural dimensions, which constitute the cleavage process zone, and the corresponding finite elements used to represent their behaviour. Predictions of brittle fracture are based on the Beremin local approach model, where the Weibull location parameter Q u and shape parameter m have been calculated using FEM for Charpy type specimen. These parameters are considered to be transferable materal properties, independent of temperature, specimen geometry or loading mode and can be used for prediction of the stress intensity factor K.

Determination of elastic-plastic properties using reverse FEA of ball indentation test

80%

Brumek J. , Strnadel B. , Dlouhý I.

2007

tom Vol. 321, z. 89

87-87

We proposed an improved technique to determine the plastic properties of material from the load-displacement curve from ball indentation test. The reverse finite element method was used for simulation of indentation test. This technique has been successfully applied on several carbon steel specimens and for all these test materials the reverse analysis results were found to agree with the data from conventional standard test method. This nondestructive assessment of deformation behavior has good potential for the other materials.

Vliv mikrostruktury na charakter tvárného porušení Cr-Ni oceli

80%

Chobot K. , Dlouhý I. , Strnadel B.

2003

tom z. 76

35-42