Notch size influence on fatigue limit of steels pertinent to grain size

2021 ◽  
pp. 106642
Author(s):  
Shuangge Yang ◽  
Chunguo Zhang
Keyword(s):  
Grain Size ◽  
Fatigue Limit

Effect of Yield Stress and Grain Size on Threshold and Fatigue Limit

1986 ◽  
Vol 108 (2) ◽  
pp. 174-178 ◽  
Author(s):  
Y. Mutoh ◽  
V. M. Radhakrishnan
Keyword(s):  
Grain Size ◽  
Stress Intensity ◽  
Yield Stress ◽  
Fatigue Limit ◽  
Threshold Stress ◽  
Experimental Investigations ◽  
Threshold Stress Intensity ◽  
Stress Intensity Range ◽  
Intensity Range ◽  
Analytical Relations

Experimental investigations have been carried out to study the effects of grain size and yield stress on fatigue limit and threshold stress intensity range. The relations between fatigue limit and grain size and yield stress and those between threshold stress intensity range and grain size and yield stress which were predicted according to the model proposed in the previous paper agreed quite well with the experimental data. The difference in the dependence of fatigue limit and threshold stress intensity range on yield stress was discussed based on the analytical relations between them.

Investigations on the Fatigue Behavior of Nanocrystalline Metals

2011 ◽  
Vol 465 ◽  
pp. 207-210 ◽  
Author(s):  
Matthias Funk ◽  
Christoph Eberl
Keyword(s):  
Grain Size ◽  
Cyclic Loading ◽  
Fourier Analysis ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
New Method ◽  
Strong Increase ◽  
Fatigue Lifetime ◽  
First Results ◽  
Load Increase

In this paper data on fatigue lifetime of nanocrystalline (nc) Ni samples is presented. The nc-Ni samples show high lifetimes and can resist large stress amplitudes. Furthermore a new method to determine the fatigue limit based on a Fourier analysis [7] is presented. First results of a load increase test suggest strong parallels to thermal and resistive measurements which can be used to determine the fatigue limit. Microstructural investigations on as received and failed samples show a strong increase in grain size induced by the cyclic loading. The processes behind this are not understood so far and will be investigated in the future.

Fatigue of Ultra-Fine Grained α-Brass

2014 ◽  
Vol 891-892 ◽  
pp. 1125-1130
Author(s):  
Yoshikazu Nakai ◽  
Takuto Imanaka ◽  
Daiki Shiozawa
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Severe Plastic Deformation ◽  
Fatigue Limit ◽  
High Strength ◽  
Angular Pressing ◽  
Fine Grain ◽  
Proof Strength

Combined methods to obtain ultra-fine grain (UFG) α-brass samples are proposed. Severe plastic deformation followed by recrystallization was conducted, where multiple rolling and equal channel angular pressing (ECAP) were employed. Recrystallization was accomplished by heat-treatment after the severe plastic deformation, and the grain size after the severe plastic deformation was decreased. By multiple rolling, plates with thickness of 0.1 mm and grain size of 1.0 μm were obtained. By ECAP process, square bar with cross-section of 6 mm × 6 mm and minimum grain size of 4.1 μm was obtained. The 0.2 % proof strength, ultimate tensile strength, and fatigue limit were increased with the value of inverse square root of grain size (Hall-Petch relationship). Then, the 0.2 % proof strength of UFG brass was tenfold, the ultimate tensile strength and the fatigue limit were two fold increases from the conventional α-brass. Because of the high strength, the scatter of fatigue strength of UFG brass was large, which reflects the sensitivity to defects in material.

An Analysis of Grain Size and Yield Stress Effects on Stress at Fatigue Limit and Threshold Stress Intensity Factor

1981 ◽  
Vol 103 (3) ◽  
pp. 229-233 ◽  
Author(s):  
Y. Mutoh ◽  
V. M. Radhakrishnan
Keyword(s):  
Stress Intensity Factor ◽  
Grain Size ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Yield Stress ◽  
Fatigue Limit ◽  
Threshold Stress ◽  
Threshold Region ◽  
Threshold Stress Intensity ◽  
Threshold Stress Intensity Factor

Fatigue limits of smooth specimens and threshold stress instensity factors of specimens with large cracks depend on the microstructure of the material. A simple model in which it is assumed that the plastic zone size near the crack tip is of the order of the grain size at the threshold region has been presented in this analysis which explains the dependence of stress at the fatigue limit and the threshold stress intensity factor on yield stress and grain size.

Research on Performance Features of Shape Memory Alloys

2014 ◽  
Vol 989-994 ◽  
pp. 652-655
Author(s):  
Guo Min Lin ◽  
Yan Hua Li
Keyword(s):  
Thermal Conductivity ◽  
Grain Size ◽  
Thermal Expansion ◽  
Transition Temperature ◽  
Melting Point ◽  
Shape Memory Alloys ◽  
Phase Change ◽  
Shape Memory ◽  
Fatigue Limit ◽  
Point Density

The shape memory effect,the classification and the principle of shape memory alloys are introduced.The performance features such as melting point,density, resistivity,thermal conductivity, thermal expansion coefficient, phase change heattensile strength fatigue limit, grain size, transition temperature,lag size,one-way shape memory, two-way shape memory of Fe-based,Cu-based and Ti-Ni based shape memory alloys are researched in detail.

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