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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Numerical and experimental evaluation of fracture characteristics for 3 Point bend pre-cracked specimen
 Vlček, Libor ; Kozák, Vladislav
An extensive investigation has been carried out on the sensitivity parameters determination describing fracture behavior of body with crack with respect to character change of true stress-strain curve with dominant region of Luders deformation.
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Influence of material characteristics on the fatigue crack growth through bi-material interface
 Náhlík, Luboš
This contribution describes a study of the behaviour of a fatigue crack growing in one material and penetrating through the bi-material interface into a second material. Dependence of the stress singularity exponent on Poisson's ratio of both materials is studied. The study especially aims to quantify the influence of the interface on the values of fatigue threshold. It is suggested that the controlling variable for the behaviour of a crack approaching to the interface is the size of the plastic zone existing near the tip of the crack. The results of the contribution makes it possible to decide whether the crack will stop at the interface or continue growing into the second material. The results contribute to a better understanding of the damage of composite materials.
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Evalution of Q-parameter in the case of microstructurally short fatigue cracks
 Seitl, Stanislav
The paper presents evaluation of the elastic-plastic Q-parameter in the case of microstructurally short fatigue cracks, i.e. for cracks for which the crack size is comparable to the scale of the characteristic microstructural dimension such as the grain size. The microstructurally short crack is modelled as a crack with its tip in the vicinity of an interface between two different materials (elastic one and steel 12060), see Fig.1. Q-parameter is calculated by means of direct use of finite element results, namely the difference from the T = 0 reference solution, see Eq.5. Q-parameter is determined as a function of the crack orientation with respect to the interface, the crack length and the ratio of Young's modulus of both materials, see. Fig.1.
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