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National Repository of Grey Literature 6 records found  Search took 0.00 seconds. 
Calculations of fract. param. of general stress concentrators:III.Analysis of the stress field around a tip of a sharp V-notch
 Náhlík, Luboš ; Gröger, Roman
In the article is under assumptions of linear elastic fracture mechanics analyzed problem of the sharp V-notch with its tip on the bi-material interface, as a example of general stress concentrator. The procedure for the determination of stress singularity exponents is performed for general cases, when this exponent lies within the interval (0,1). The procedure for an estimation of the general stress intensity factor for considered configuration is shown too. Here is suggested method which consider both types of stress singularities which exist in this case.
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Calculations of fracture parameters of a general stress concentrators: III. Analysis of the stress field around a tip of a sharp
 Náhlík, Luboš ; Gröger, Roman
In the article is under assumptions of linear elastic fracture mechanics analyzed problem of the sharp V-notch with its tip on the bi-material interface, as a example of general stress concentrator. The procedure for the determination of stress singularity exponents is performed for general cases, when this exponent lies within the interval (0,1). The procedure for an estimation of the general stress intensity factor for considered configuration is shown too. Here is suggested method which consider both types of stress singularities which exist in this case.
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Determination of fracture parameters of general stress concentrators: I. Estimation of generalized stress intensity factor using
 Klusák, Jan
A sharp notch is presented as a model for simulation of behaviour of generalized stress singular concentrators. Estimations of generalized stress intensity factor are shown using direct methods. Direct methods can be used for 2D and 3D structures. Advantage is the fact that these methods cooperate with standard finite element systems.
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The influence of T-stress on proporcional factor
 Hutař, Pavel
Relation between crack opening displacement and J integral is of a great importance in fracture mechanics.The basic aim of this paper is to describe an influence of T-stress on proporcional factor. This factor is occured on the J integral and CTOD estimation equations. Specimens with different values of T-stress (compact tension,three point bend and single edge cracked tension) are analysed by finite element method, the factor is calculated as function of corresponding crack length. The influence of different material constants on proporcional factor are analysed by modified boundary layer model. Results are discussed from the point of view of two-parameter fracture mechanics.
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Influence of bi-materials interface on crack interaction
 Seitl, Stanislav
Existence of the interface between regions with different elastic properties has a pronounced influence on the behaviour of cracks. The aim of the present contribution are a modelling and analysis of two perpendiculars cracks growing in a vicinity of the interface between two different elastic materials. The dependence of stress intensity factor for mod I (KI) on the distance of a crack with respect to the interface is studied. The results contribute to better understanding of crack's behaviour in relation to microstructure of material.
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Statistical and physical aspects of the use of master curve concept at assessment of loading rate effects on transition behavior
 Jurášek, Ladislav ; Kohout, J. ; Holzmann, Miloslav ; Dlouhý, Ivo
The use of master curve at assessments of loading rate effects on fracture toughness transition behaviour. Independence of the master curve shape at different loading rates has been analysed based on measurements. In addition, shift of reference temperature with loading rate and physical aspects of fracture toughness change at different temperatures and loading rates has been discussed. From the statistical point of view, comparison of methods for reference temperature determination has been carried out.
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