Influence of Temperature on the Fatigue Life of a Quasi-isotropic Gr/Ep Laminate

Abstract In this paper there are shown the results of low-cycle fatigue testing of steel P91 samples. During the testing there was conducted a fixed amplitude loading testing as well as programmed loading with various sequence degrees of the program. The testing was done in two temperatures: T=20°C and T=600°C. During the testing a cyclic steel weakening was observed without a clear period of stabilization. Greater changes of the cyclic properties were observed in temperature T=600°C. The influence of temperature on the fatigue life was determined in this paper. This influence is dependent on the degree of strain. It’s a minor one in the range of big strain and increases in the process of decreasing the degree of strain. Furthermore, the impact of the loading program type was determined on the test results and fatigue life calculations

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Influence of temperature on low cycle properties of martensitic cast steel

Archive of Mechanical Engineering ◽

10.2478/v10180-012-0017-y ◽

2012 ◽

Vol 59 (3) ◽

pp. 329-342 ◽

Cited By ~ 2

Author(s):

Grzegorz Golanski ◽

Stanisław Mrozinski ◽

Krzysztof Werner

Keyword(s):

Fatigue Life ◽

Fatigue Strength ◽

Room Temperature ◽

Cast Steel ◽

Cyclic Softening ◽

Influence Of Temperature ◽

Influence Of Temperature On ◽

Two Temperatures ◽

Stabilization Period

The paper presents the results of research on low cycle properties of highchromium martensitic GX12CrMoVNbN9-1 (GP91) cast steel. The tests of fatigue strength were carried out at two temperatures: room temperature and at 600°C. At both temperatures the occurrence of cyclic softening of the cast steel was observed, revealing no clear stabilization period. Moreover, it has been proved that the fatigue life is influenced by the temperature which depends on the level of strain. The greatest influence was observed for the smallest strain levels applied in the research.

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Influence of Temperature on the Strain Controlled Fatigue Behaviour of Alloy 690 Tube Material

12th International Conference on Nuclear Engineering, Volume 1 ◽

10.1115/icone12-49262 ◽

2004 ◽

Author(s):

Guocai Chai ◽

Ping Liu ◽

Johan Frodigh

Keyword(s):

Fatigue Life ◽

Elevated Temperature ◽

Strain Hardening ◽

Fatigue Crack Initiation ◽

Cyclic Strain ◽

Fatigue Behaviour ◽

Tube Material ◽

Influence Of Temperature ◽

Alloy 690 ◽

Influence Of Temperature On

Strain controlled fatigue tests for hot-extruded tube material of Alloy 690 (Sandvik Sanicro 69) have been performed at room temperature (RT) and at elevated temperature (204°C). The influences of temperature on the cyclic deformation behaviour and the fatigue life have been investigated. The influence of temperature on the fatigue life is relatively small in the temperature range investigated. However, the fatigue behaviour at elevated temperature is quite different from that at RT. A second cyclic strain hardening was observed at 204°C. The possible mechanisms have been investigated using transmission electron microscopy. Besides dislocation mechanism, the interactions between moving dislocations and stacking faults and between interstitial atoms and moving dislocations could also contribute to this secondary cyclic strain hardening. The formation of micro-twins during cyclic loading at 204°C and its influence on the cyclic stress-strain response were also discussed. Temperature affects both fatigue crack initiation and propagation behaviour. Increase in temperature promotes duplex slipping process, which causes the formation of striation.

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Influence of temperature on fatigue life or reinforced pavement by whitetopping

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/356/1/012015 ◽

2018 ◽

Vol 356 ◽

pp. 012015

Author(s):

A Szydło ◽

P Mackiewicz

Keyword(s):

Fatigue Life ◽

Influence Of Temperature ◽

Influence Of Temperature On

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Influence of Temperature on the Fatigue of CC/PWB Joints

Journal of the IEST ◽

10.17764/jiet.2.33.1.t7q08846k1276q75 ◽

1990 ◽

Vol 33 (1) ◽

pp. 17-25

Author(s):

Harvey Solomon

Keyword(s):

Fatigue Life ◽

Low Cycle Fatigue ◽

Hysteresis Loops ◽

Cycle Fatigue ◽

Printed Wiring Board ◽

Influence Of Temperature ◽

Joint Resistance ◽

Influence Of Temperature On ◽

Chip Carrier ◽

Wiring Board

This is a study of the low cycle fatigue of chip carrier/ printed wiring board joints tested at -55° C (-67° F) and 125° C (257° F). It is contrasted to a previous study where the joints were tested at 35° C (95° F). The behavior at 35° C and 125° C was the same. Differences were noted, however, at -55° C. The hysteresis loops were distorted. The slopes of the displacement vs. fatigue life curves were slightly lower and the fatigue lives were longer. These differences were especially significant when the change in joint resistance was used to define failure.

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The effect of temperature on high-resolution TEM image contrast

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139573 ◽

1995 ◽

Vol 53 ◽

pp. 640-641

Author(s):

T. Geipel ◽

W. Mader ◽

P. Pirouz

Keyword(s):

Form Factor ◽

Inelastic Scattering ◽

Accurate Method ◽

Waller Factor ◽

Effect Of Temperature ◽

Specimen Thickness ◽

Influence Of Temperature ◽

Debye Waller Factor ◽

Influence Of Temperature On ◽

Atomic Form Factor

Temperature affects both elastic and inelastic scattering of electrons in a crystal. The Debye-Waller factor, B, describes the influence of temperature on the elastic scattering of electrons, whereas the imaginary part of the (complex) atomic form factor, fc = fr + ifi, describes the influence of temperature on the inelastic scattering of electrons (i.e. absorption). In HRTEM simulations, two possible ways to include absorption are: (i) an approximate method in which absorption is described by a phenomenological constant, μ, i.e. fi; - μfr, with the real part of the atomic form factor, fr, obtained from Hartree-Fock calculations, (ii) a more accurate method in which the absorptive components, fi of the atomic form factor are explicitly calculated. In this contribution, the inclusion of both the Debye-Waller factor and absorption on HRTEM images of a (Oll)-oriented GaAs crystal are presented (using the EMS software.Fig. 1 shows the the amplitudes and phases of the dominant 111 beams as a function of the specimen thickness, t, for the cases when μ = 0 (i.e. no absorption, solid line) and μ = 0.1 (with absorption, dashed line).

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