Browsing Pokročilé kovové materiály a kompozity na bázi kovů by Issue Date
Now showing items 1-20 of 26
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Initiation of Fatigue Cracks in Ultrafine-grained Materials in High-cycle Fatigue Region
(Elsevier, 2014-06-25)Initiation of fatigue cracks in materials with conventional grain (CG) size was investigated very thoroughly in the past. There is an extensive knowledge on the localization of cyclic plasticity and early crack development; ... -
3D Morphology of Fracture Surfaces Created by Mixed-mode II+III Fatigue Loading in Metallic Materials
(Elsevier, 2014-06-25)This paper presents results of 3Dfractographical analysis of shear-mode fatigue cracks in ARMCO iron, alpha-titanium, nickel and the X5CrNi18-10 steel. Observation of crack paths on a microscopic level enables us to reveal ... -
Near threshold fatigue crack growth in ultrafinegrained copper
(IOP Publishing, 2014-08-08)The near threshold fatigue crack growth in ultrafine-grained (UFG) copper at room temperature was studied in comparison to conventional coarse-grained (CG) copper. The fatigue crack growth rates da/dN in UFG copper were ... -
Initiation of fatigue cracks in AZ91 Mg alloy processed by ECAP
(IOP Publishing, 2014-08-08)Mechanism of fatigue crack initiation was investigated in ultrafine-grained (UFG) magnesium alloy AZ91 processed by equal channel angular pressing (ECAP). Fatigue behaviour of UFG material was compared to the behaviour of ... -
Effects of microstructure and crystallography on crack path and intrinsic resistance to shear-mode fatigue crack growth
(Italian Group of Fracture, 2015-09-16)The paper focuses on the effective resistance and the near-threshold growth mechanisms in the ferritic-pearlitic and the pure pearlitic steel. The influence of microstructure on the shear-mode fatigue crack growth is divided ... -
A fractographic study of bending/torsion fatigue failure in metallic materials with protective surface layers
(Hindawi, 2016-06-10)Results are given of a fractographic study of biaxial in-phase bending/torsion fatigue fractures in specimens made of nitrided steel and nickel-based superalloy with protective coatings (diffusion coatings and plasma-sprayed ... -
Stress coupling effect on ideal shear strength: tungsten as a case study
(Hindawi, 2016-12-05)Mechanical response of a perfect bcc tungsten crystal to a multiaxial loading was investigated from first principles. The multiaxial stress state consisted of the shear stress and a superimposed compressive triaxial stress ... -
Simple criterion for predicting fatigue life under combined bending and torsion loading
(Gruppo Italiano Frattura, 2017-07-01)Multiaxial fatigue is a challenging problem and, consequently, a number of methods has been developed to aid in design of components and assemblies. Following the complexity of the problem, these approaches are often ... -
On the connection between mode II and mode III effective thresholds in metals
(Italian Group of Fracture, 2017-07-01)Closure-free long cracks under the remote mode III loading grow in a more complicated way than those under the remote mode II. For bcc metals, a coplanar in-plane spreading of tongues driven by the local mode II loading ... -
Crack onset assessment near the sharp material inclusion tip by means of modified maximum tangential stress criterion
(Gruppo Italiano Frattura, 2017-10-01)In the case of particle reinforced composites, where the particles are in a form of sharp material inclusions, singular stress concentration exists on each tip of each inclusion. This is due to the geometric and material ... -
Wear of grinding rotors with thermally-sprayed coatings in a high-speed mill
(Elsevier, 2018-10-15)In this paper, the erosion behavior of three types of protective thermally-sprayed coatings and non-coated substrate steel was investigated under semi-industrial test conditions using a laboratory high-speed pin mill DESI-11. ... -
Strength and Brittleness of Interfaces in Fe-Al Superalloy Nanocomposites under Multiaxial Loading: An ab initio and Atomistic Study
(MDPI, 2018-10-24)We present an ab initio and atomistic study of the stress-strain response and elastic stability of the ordered Fe3Al compound with the D03 structure and a disordered Fe-Al solid solution with 18.75 at.% Al as well as of a ... -
Deposition of Hydroxyapatite and Tricalcium Phosphate Coatings by Suspension Plasma Spraying: Effects of Torch Speed
(Elsevier, 2018-12-01)This research focuses on the deposition of hydroxyapatite (HA) and tricalcium phosphate (TCP) coatings produced by suspension plasma spraying (SPS) using in-house liquid feedstock suspensions. The work studied the effects ... -
An Ab Initio Study of Pressure-Induced Reversal of Elastically Stiff and Soft Directions in YN and ScN and Its Effect in Nanocomposites Containing These Nitrides
(MDPI, 2018-12-01)Using quantum-mechanical calculations of second- and third-order elastic constants for YN and ScN with the rock-salt (B1) structure, we predict that these materials change the fundamental type of their elastic anisotropy ... -
Microcrack interaction with circular inclusion and interfacial zone
(Gruppo Italiano Frattura, 2019-01-04)A geometrically simplified plane elasticity problem of a finitesmall crack emanating from a thin interfacial zone surrounding the circularinclusion situated in the finite bounded domain is investigated. The crack isarbitrarily ... -
Fatigue Life of 7475-T7351 Aluminum After Local Severe Plastic Deformation Caused by Machining
(MPDI, 2019-11-03)The fatigue properties of thermo-mechanically treated and machined aluminum alloy 7475-T7351 have been studied. The applied advanced machining strategy induced intensive plastic deformation on the machined surface under ... -
Extraordinary Response of H-Charged and H-Free Coherent Grain Boundaries in Nickel to Multiaxial Loading
(Multidisciplinary Digital Publishing Institute, 2020-07-08)The cohesive strength of 3, v5, and v11 grain boundaries (GBs) in clean and hydrogen-segregated fcc nickel was systematically studied as a function of the superimposed transverse biaxial stresses using ab initio methods. ... -
Geometric Modeling of the Valencia Orange (Citrus sinensis L.) by Applying Bezier Curves and an Image-Based CAD Approach
(MDPI AG, 2020-07-29)The computer-aided design of fruits are used for different purposes, e.g., to determine mechanical properties by applying engineering simulations, to design postharvest equipment, and to study the natural changes related ... -
Classically determined effective Delta K fails to quantify crack growth rates
(Elsevier, 2020-08-01)Decomposition of the resistance to fatigue crack growth into the intrinsic and extrinsic component is very important for understanding of fatigue failure mechanisms, relation to microstructure and modelling of residual ... -
Impact of Antiphase Boundaries on Structural, Magnetic and Vibrational Properties of Fe3Al
(MDPI, 2020-11-01)We performed a quantum-mechanical study of the effect of antiphase boundaries (APBs) on structural, magnetic and vibrational properties of Fe3Al compound. The studied APBs have the {001} crystallographic orientation of ...