Pokročilé kovové materiály a kompozity na bázi kovů
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Advantageous Description of Short Fatigue Crack Growth Rates in Austenitic Stainless Steels with Distinct Properties
(MDPI, 2021-03-01)In this work two approaches to the description of short fatigue crack growth rate under large-scale yielding condition were comprehensively tested: (i) plastic component of the J-integral and (ii) Polak model of crack ... -
Entropy-Driven Grain Boundary Segregation: Prediction of the Phenomenon
(MDPI, 2021-08-01)The question is formulated as to whether entropy-driven grain boundary segregation can exist. Such a phenomenon would be based on the assumption that a solute can segregate at the grain boundary sites that exhibit positive ... -
Effect of Underload Cycles on Oxide-Induced Crack Closure Development in Cr-Mo Low-Alloy Steel
(MDPI, 2021-05-01)Underload cycles with small load amplitudes below the fatigue crack growth threshold are dominantly considered as insignificant cycles without any influence on fatigue lifespan of engineering structural components. However, ... -
Fatigue characterization of polyethylene under mixed mode I/III conditions
(Elsevier, 2021-04-01)Mixed mode I/III fatigue fracture behaviour of bulk polymers is scarcely investigated. Thus, the aim of this work is to focus on the comparison of pure mode I and mixed mode I/III fatigue loading of polyethylene. During ... -
Effect of Solution Annealing on Fatigue Crack Propagation in the AISI 304L TRIP Steel
(MDPI, 2021-03-01)Fatigue crack propagation in near-threshold regime was studied in the 304L austenitic stainless steel in two microstructural states: as-received (AR) with finer microstructure and low susceptibility to the transformation-induced ... -
Experimental and Numerical Investigation of Thermomechanical Cycling of Notched NiTi Shape Memory Ribbon Using SMA Model Accounting for Plastic Deformation
(Elsevier, 2021-09-07)Shape memory alloys (SMAs) are being increasingly applied as thermally driven actuators. The commercially available SMA elements, however, frequently contain stress risers, either due to internal or surface defects or due ... -
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 ... -
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 ... -
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 ... -
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. ... -
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 ... -
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; ... -
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 ... -
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 ... -
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. ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ...
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