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National Repository of Grey Literature 4 records found  Search took 0.01 seconds. 
Initial stages of fatigue failure of polycrystalline materials
 Man, Jiří ; Petrenec, Martin ; Obrtlík, Karel ; Polák, Jaroslav
Geometry of persistent slip markings (PSMs) formed during cyclic loading of polycrystalline stainless steels and superalloy was studied using atomic force microscopy (AFM) and high-resolution scanning electron microscopy (SEM-FEG). Internal dislocation structure was investigated using transmission electron microscopy (TEM). Persistent slip bands with dislocation structure corresponding to the cyclic strain localization were identified and correlated with PSMs observed on the specimen surface.
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Determination of threshold values of components with protective layers
 Náhlík, Luboš ; Bareš, Pavel
The contribution is focused on the influence of existing fatigue cracks in protective layers on fatigue life of structures with protective layers. The problem is solved under conditions of linear elastic fracture mechanics with help of finite element method. Is shown, that in the case of the hard protective layer on the ductile substrate represents existing crack with its tip on the bi-material interface dangerous singular stress concentrator, because of decrease of threshold values of applied loading necessary for crack propagation. Knowledge of crack propagation in protective film is of paramount importance when studying potential failure of the substrate.
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Reliability assessment of bodies with general singular stress concentrator
 Klusák, Jan
The paper presents a method leading to reliability assessment of bodies with general singular stress concentrator. The method uses combination of analytical and numerical procedures to determine fracture-mechanics parameters. The approach is based on comparison of fracture behaviour of body with a crack and a body with a general singular stress concentrator. The goal of the paper is to determine value of applied stress that leads to initiation of failure of construction.
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View from statistics perspective on fatigue crack growth influenced by constraint effect
 Seitl, Stanislav
The issue of the fatigue crack behavior is studied in connectivity on different levels of constraint. The constraint is quantified by using T-stress. The problems are studied on two different forms of specimen (Center cracked plate tension specimen and compact tension specimen) that have different values of T-stress for the same value of the stress intensity factor.
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