Influence of a change in loading frequency on the low-cycle fatigue resistance of a constructional steel in seawater

1983 ◽  
Vol 19 (2) ◽  
pp. 109-111
Author(s):  
A. V. Kobzaruk
Keyword(s):  
Fatigue Resistance ◽  
Low Cycle Fatigue ◽  
Constructional Steel ◽  
Loading Frequency ◽  
Cycle Fatigue

The Investigation of the Optimization Scheme of the Low-cycle Fatigue Cropping Based on the Acoustic Emission Technique

2021 ◽  
Author(s):  
Yujian Ren ◽  
Jingxiang Li ◽  
Yuanzhe Dong ◽  
Dong Jin ◽  
Shengdun Zhao
Keyword(s):  
Acoustic Emission ◽  
High Frequency ◽  
Control Method ◽  
Low Cycle Fatigue ◽  
Control Strategies ◽  
Low Frequency ◽  
Loading Frequency ◽  
Cycle Fatigue ◽  
Al 6061 ◽  
Whole Process

Abstract High efficiency and good section quality are two main objectives of metal bar cropping. A suitable control method can help to achieve both goals. An investigation of the control method of low-cycle fatigue cropping (LCFC) based on the acoustic emission (AE) technique has been proposed in this study. Ring-down counts and kurtosis are used to monitor the whole process of LCFC. The results showed that kurtosis is more suitable for monitoring the LCFC process and as a critical parameter to optimize the control method than ring-down counts in the noisy factory environment.Moreover, three types of materials are studied in this experiment; by combine with the AE results, macroscopic images and microscopic images of sections, characteristics of various LCFC stages are obtained. The results also indicated reduce the area of the transient fracture zone is the key to improve the section quality. Reducing the load frequency before the unstable crack propagation stage will beneficial to realize the goals. Based on the evaluation of kurtosis, an optimized control method is presented, and two control parameters: transient time T and the critical value of the slope of kurtosis C are determined. For 16Mn, 1045 and Al 6061, the T is 5s, 10s, and 1s, respectively. For 16Mn, 1045, and Al 6061, the C is 100, 300, and 0, respectively. Two parameters, h and S, are used to evaluate the section quality and four control strategies are compared. The results indicate the optimal control methods can improve the section quality effectively. The influence trend of reducing loading frequency is investigated by further comparison. It can be seen as the frequency decreases, the efficiency of the section quality improving decreases. In order to realize the optimal results, different control strategies are adopted for different materials. Strategy 1 (high frequency is 20Hz，high frequency thought the whole process), strategy 2 (high frequency is 20Hz，low frequency is 8.33Hz), and strategy 3 (high frequency is 20Hz，low frequency is 6.67Hz) is suitable for Al 6061, 1045, and 16Mn, respectively.

Low Cycle Fatigue Properties of FGH720Li Superalloy

2021 ◽  
Vol 1035 ◽  
pp. 292-296
Author(s):  
Zi Chao Peng ◽  
Jun Ying Sheng ◽  
Xu Qing Wang ◽  
Yue Tang
Keyword(s):  
Fatigue Life ◽  
Powder Metallurgy ◽  
Applied Stress ◽  
Low Cycle Fatigue ◽  
Influencing Factor ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Nickel Base Superalloy ◽  
Loading Frequency ◽  
Cycle Fatigue

Low cycle fatigue (LCF) properties of a powder metallurgy(PM) nickel base superalloy FGH720Li were systematically studied in this work, including smooth LCF and notched LCF tested at various temperatures and different stress. The relationship between the fatigue life and applied stress was analyzed both for smooth fatigue and notch fatigue tests. The effects of loading frequency and stress ratio on LCF behavior were also studied. As an important influencing factor of the fatigue life in powder metallurgy superalloy, the effect of inclusions on LCF life was also investigated. The results showed that the fatigue properties of FGH720Li alloy was excellent, when tested at the temperature of 450°C and applied stress of 1230MPa, the fatigue life could exceed 5×104 cycles. When tested at 650°C and 1150MPa, the average fatigue life was still beyond 2×105 cycles.

Low cycle fatigue resistance of SA533 pressure vessel steels

2003 ◽  
Vol 19 (11) ◽  
pp. 1575-1584 ◽  
Author(s):  
J. Y. Huang ◽  
J. R. Hwang ◽  
R. C. Kuo ◽  
C. Y. Chen
Keyword(s):  
Fatigue Resistance ◽  
Pressure Vessel ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Pressure Vessel Steels

Low-cycle fatigue resistance of AD1 aluminum and AMg5 aluminum alloy

1985 ◽  
Vol 21 (2) ◽  
pp. 66-68 ◽  
Author(s):  
A. A. Kholodilo ◽  
L. M. Balyuk ◽  
R. V. Modestova
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Resistance ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Amg5 Aluminum Alloy

Effect of PVD coatings on the strain and low-cycle fatigue resistance of stainless steel and titanium alloys

2011 ◽  
Vol 43 (6) ◽  
pp. 604-614 ◽  
Author(s):  
A. P. Gopkalo ◽  
N. R. Muzyka ◽  
A. V. Rutkovskii ◽  
V. P. Shvets
Keyword(s):  
Stainless Steel ◽  
Titanium Alloys ◽  
Fatigue Resistance ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Pvd Coatings

The Issue of Low Cycle Fatigue Scope in the Description of Two-Parameter Fatigue Characteristics

2014 ◽  
Vol 598 ◽  
pp. 225-230
Author(s):  
Grzegorz Szala
Keyword(s):  
High Cycle Fatigue ◽  
Low Cycle Fatigue ◽  
Constructional Steel ◽  
Evaluation Criterion ◽  
Cycle Fatigue ◽  
Fatigue Characteristics ◽  
Two Parameter

This paper discusses the issue connected with determination of the low cycle fatigue scope for the two-parameter fatigue characteristics. Low cycle fatigue (LCF) and high cycle fatigue (HCF) evaluation criterion for constructional steel (C45, S355J0 and 41Cr4) has been discussed.

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