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Перегляд Прoблемы прочности, 2008 за темою "Научно-технический раздел"

Репозиторій DSpace/Manakin

Перегляд Прoблемы прочности, 2008 за темою "Научно-технический раздел"

Сортувати за: Порядок: Результатів:

  • Fracture toughness of multilayer pipes 
    Nezbedova, E.; Fiedler, L.; Majer, Z.; Vlach, B.; Knesl, Z. (Проблемы прочности, 2008)
    Multilayer pipes composed of various materials improve partially the properties of a pipe system and are frequently used in service. To estimate the lifetime of these pipes the basic fracture parameters have to be measured. ...
  • Grain boundary influence during short fatigue crack growth using a discrete dislocation technique 
    Hansson, P.; Melin, S. (Проблемы прочности, 2008)
    We have studied the effect of a grain boundary in front of a short edge crack on its propagation under cyclic loading conditions in bcc iron. The used model is a combination of a discrete dislocation formulation and a ...
  • Hot-cracking of high-alloyed steels evaluated by wedge rolling test 
    Schindler, I.; Suchanek, P.; Rusz, S.; Kubecka, P.; Sojka, J.; Heger, M.; Liska, M.; Hlisnikovsky, M. (Проблемы прочности, 2008)
    We present a new methodology of determination of hot-cracking f metallic materials, which is based on laboratory application of the wedge rolling test and computer processing of the results obtained. The experiment was ...
  • Influence of carbides morphology on fracture toughness of cast steel G200CrMoNi4-3-3 
    Stradomski, Z.; Pirek, A.; Dyja, D. (Проблемы прочности, 2008)
    We analyze the influence of small modification of chemical composition of G200CrMoNi4-3-3 cast steel on the morphology of carbides and on material crack resistance. Using the Termo-Calc software the volume fraction of ...
  • Influence of nitriding on the fatigue behavior and fracture micromechanisms of nodular cast Iron 
    Konecna, R.; Nicoletto, G.; Majerova, V.; Baicchi, P. (Проблемы прочности, 2008)
    Surface modification processes are increasingly used to fully exploit material potential in fatigue critical applications because fatigue strength is sensitive to surface conditions. Nitriding is extensively adopted with ...
  • In-service fatigue fracture mechanisms in covered disks of a TV3-117VK helicopter turbine engine 
    Shanyavskii, A.A.; Potapenko, Yu.A. (Проблемы прочности, 2008)
    In-service propagatingfatigue cracks were examined in EI-698VD superalloy thin turbine covered disks ofthefirst, second, and third stages ofa TV3-117VK helicopter engine within service lifes of 200-1800 h. To reveal causes ...
  • In situ scanning electron microscopy study of fatigue crack propagation 
    Jacobsson, L.; Persson, C.; Melin, S. (Проблемы прочности, 2008)
    The fatigue crack propagation rate is influenced by various mechanisms at the very vicinity of the crack tip, e.g., local plasticity and/or creep, microcracking, crack branching, and crack closure induced by plasticity and ...
  • Localization of plastic deformation and fracture in aluminum polycrystals 
    Zarikovskaya, N.V.; Zuev, L.B. (Проблемы прочности, 2008)
    The effect of the grain size as a basic structural parameter on plastic strain macrolocalization has been studied for polycrystalline aluminum. The mathematical form of the above dependence has been verified. The limiting ...
  • Mechanical behavior of Zr-based bulk metallic glasses 
    Nowak, S.; Ochin, P.; Pasko, A.; Guerin, S.; Champion, Y. (Проблемы прочности, 2008)
    Bulk metallic glasses have a very high corrosion resistance and mechanical strength. Bulk metallic glasses show elastic-perfectly plastic behavior with an extended region of elastic strain (≈ 2%). But at room temperature ...
  • Mechanical properties and fracture behavior of high-strength steels 
    Musalek, R.; Hausild, P.; Siegl, J.; Bensch, J.; Slama, J. (Проблемы прочности, 2008)
    Typical thicknesses ofhigh-strength steels (HSS) sheets used in the car industry are inapplicablefor standardized testingprocedures. The aim ofthis study is topropose an appropriate methodologyfor testing and comparing of ...
  • Mechanisms of Fracture in Neutron-Irradiated 15Ch2MFA Steel 
    Valek, S.; Hausild, P.; Kytka, M. (Проблемы прочности, 2008)
    The influence of irradiation on fracture properties of 15Ch2MFA pressure vessel steel is studied. The distribution of inclusions and carbides is characterized. The quantitative fractography of broken Charpy specimens is ...
  • Method for low-cycle fatigue life assessment of metallic materials under multiaxial loading 
    Shukaev, S.; Gladskii, M.; Zakhovaiko, A.; Panasovskii, K. (Проблемы прочности, 2008)
    A new method of fatigue life assessment under multiaxial low-cycle regular and irregular loading is proposed, which is based on the modified Pisarenko-Lebedev criterion, the linear damage accumulation hypothesis, and the ...
  • Microstructural and fracture analysis of aged cast duplex steel 
    Dyja, D.; Stradomski, Z.; Pirek, A. (Проблемы прочности, 2008)
    The effect of increased carbon content and heat treatment parameters on the microstructure and selected properties of ferritic-austenitic duplex cast steel is discussed. Test results show that the cast steel microstructure ...
  • Microstructural features of failure surfaces and low-temperature mechanical properties of Ti-6Al-4V ELI ultra-fine grained alloy 
    Tabachnikova, E.D.; Podolskiy, A.V.; Smirnov, S.N.; Csach, K.; Miskuf, J.; Saitova, L.R.; Semenova, I.P; Valiev, R.Z.; Bengus, V.Z. (Проблемы прочности, 2008)
    Microstructural regularities of failure surfaces and low-temperature mechanical characteristics in quasistatic uniaxial tension and compression have been studied for ultra-fine grained structural states of Ti-6Al-4V ELI ...
  • Microstructure and fracture morphology of thermally sprayed refractory metals and ceramics 
    Kovarik, O.; Siegl, J. (Проблемы прочности, 2008)
    The microstructural characteristics such as porosity, splat morphology and grain size of thermally sprayed coatings made of both ceramic and refractory metals are investigated. Al2O3 and Cr2O3 coatings represent ceramic ...
  • Near Surface Modification Affected by Hydrogen Interaction: Global Supplemented by Local Approach 
    Katz, Y.; Tymiak, N.; Gerberich, W.W. (Проблемы прочности, 2008)
    The current study is centered on elastic-plastic solid interaction with hydrogen. Here, the environment isfree hydrogen, from either external or internal origins providing as such aggressive effects. In this context, near ...
  • Numerical simulation of elastic linear micropolar media based on the pore space length scale assumption 
    Jeong, J.; Adib-Ramezani, H.; Al-Mukhtar, M. (Проблемы прочности, 2008)
    The 3D micropolar theory numerical simula­tions have been performed on the brittle isotro­pic materials (amorphous glass, brittle rock and two different lightweight concretes) with differ­ent pore sizes using the cylindrical ...
  • On mechanics of deformation and crushing processes 
    Berka, L. (Проблемы прочности, 2008)
    The mechanics of crushing and breaking of particles is one of the most intractable problems in materials science. The stressed states of processed materials are significantly inhomogeneous, and thus the deformation and ...
  • Quantitative fractographic analysis of impact fracture surfaces of steel R73 
    Mrazkova, L.; Lauschmann, L. (Проблемы прочности, 2008)
    Macroscopic images offracture surfaces of Charpy test specimens of steel R73 were studied, where bright spots in images represent cleavage facets or ductile dimples, respectively, both in special orientations. Within image ...
  • Relation between Mechanical Properties and Microstructure of Cast Aluminum Alloy AlSi9Cu3 
    Panuskova, M.; Tillova, E.; Chalupova, M. (Проблемы прочности, 2008)
    One common material for engine applications is the AlSi9Cu3 alloy. This alloy has a good castability, excellent machinability, medium strength, and low specific weight. The study was focused on the investigation of the ...

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