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1
100%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 315-331
2
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 46-48
EN An innovative type of one-point rolling contact fatigue (RCF) machine was developed to investigate crack initiation and propagation in metals. The microstructural changes and propagation of subsurface cracks during rolling contact in specimens tested by using the new device were studied by laser con[...]
3
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 44-45
EN Along with external forces and the macro-geometry of cracked bodies, the local stress intensity factors k at fronts of brittle and fatigue cracks are also determined by internal residual stress fields and the crack front mi- crogeometry (extrinsic shielding). Consequently, the values of k that repre[...]
4
63%
Prace Instytutu Lotnictwa
PL W pracy poddano analizie wybrane osobliwości rozwoju pęknięć zmęczeniowych, w szczególności związane z krzywymi długość pęknięcia w funkcji liczby cykli lub prędkość propagacji w funkcji zakresu współczynnika intensywności naprężeń, tj. krzywych typowych testów z cyklicznie zadawanymi przeciążeniami[...]
EN Some peculiarities of fatigue crack growth, ones referred to curves of a crack length vs. the number of cycles or the rate of propagation vs. the range of stress intensity factor, i.e. curves typical of tests with overloads applied in cycles for the aluminium alloy and the constructional steel, has [...]
5
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 82 29-36
EN The growth of a short edge crack under fatigue loading is investigated in detail for more than 11 000 cycles. The developing local plasticity consists of discrete dislocations that are emitted from the crack tip. The edge crack is modelled by a distribution of dislocation dipoles. The competition be[...]
6
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 82 115-122
EN An experimental technique to analyze images of fatigue cracks taken in-situ in an environmental scanning electron microscope is described. This technique finds the same spot on the surface of the material in different images and generates a displacement fields that can give information on for exampl[...]
7
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 82 131-138
EN Nowadays,the estimation of fatigue crack initiation of industrial parts presents growing economic interest. Usually, fatigue life predictions in rubber studies are given by a component of stress or strain tensor according to the number of cycles. This often involves difficulties due to the complexit[...]
8
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 82 187-194
EN Crack closure levels derived from the finite element analysis and from the local compliance measurements for structural steel are compared. It is shown that the observed crack opening stress values fall in between the numerical results obtained assuming the plane strain conditions and the plane stre[...]
9
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 82 195-202
EN Specimens from BS L65 4 percent cooper alloy were tested under cyclic tension and static compression. The constant compression was used to reproduce the fretting damage on the specimen surface. It was shown that the place of the fretting damage has not regular disposition on the specimen surface wer[...]
10
63%
Przegląd Mechaniczny
2005 nr 3 40-44
PL W pracy przedstawiono analizę oddziaływania płynu zamkniętego w pęknięciu z wykorzystaniem metody poszukiwania stanów równowagi. W celach porównawczych wykonano również obliczenia dla pęknięcia bez płynu oraz ze śladową ilością płynu, wystarczająca jedynie na zwilżenie ścianek pęknięcia. Dla każdego[...]
EN This paper presents analysis of reaction of liquid closed in the crack using equilibrium state searching method. In order to comparison there are also presented calcula-tions for crack without liquid and with the small amount of liquid sufficient only for crack walls re-wetting. Expected crack propa[...]
11
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 257-276
12
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 243-256
13
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 277-296
14
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 53-64
15
63%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2005 z. 79 333-352
16
51%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 94-97
EN Applications of analytical models for crack growth analysis of complex shape components can be crucial for appropriate crack growth life assessments. Several models for an example component are presented in the paper along with some suggestions aimed at improving the life assessments. The suggestion[...]
17
51%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 21-23
EN Fatigue of steel components occurs when small cracks form and continue to grow to a size large enough to cause failure. Detecting the cracks and determining whether the cracks will cause failure is very important for developing reliability of steel components. We applied a non-destructive method of [...]
18
51%
Zeszyty Naukowe. Mechanika / Politechnika Opolska
2011 z. 99 53-54
EN An assessment of the residual fatigue life of plasma-nitrided high-strength low-alloy steel specimens subjected to symmetrical in-phase bending-torsion loading has been performed. All specimens failed due to the internal fish-eye type of fracture initiated at non-metallic inclusions within the speci[...]
19
51%
Przegląd Mechaniczny
2008 nr 6 39-43
PL Praca zawiera wyniki badań doświadczalnych rozwoju pęknięć zmęczeniowych w płaskich próbkach krzyżowych. Próbki wykonano ze stali 18G2A (S355J0) z koncentratorem naprężeń w postaci centralnego otworu o średnicy 3,0 mm i bez otworu. Dwuosiowe badania zmęczeniowe prowadzono przy obciążeniu z kontrolow[...]
EN The paper presents the experimental results of fatigue crack growth in the cruciform plane specimens. The specimens made of 18G2A (S355JO) steel, each with one stress concentrator i n form of the central hole of 3.0 mm in diameter and without the hole were used. Biaxial fatigue tests were performed [...]
20
51%
Eksploatacja i Niezawodność
2007 nr 4 3-8
EN For important fatigue-sensitive structures of aircraft whose breakdowns cause serious accidents, it is required to keep their reliability extremely high. In this paper, we discuss inspection strategies for such important structures against fatigue failure. The focus is on the case when there are fat[...]
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