Effect of Heat-to-heat and Melt Practice Variations upon Fatigue Crack Growth in Two Austenitic Steels

2009 ◽  
pp. 3-3-13
Author(s):  
LA James
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Austenitic Steels ◽  
Practice Variations

Comparison of Fatigue Crack Growth Curves of Japan, the United States, and European Union Code and Standards

2012 ◽  
Vol 134 (3) ◽  
Author(s):  
Kiminobu Hojo ◽  
Yukio Takahashi
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Nuclear Power ◽  
Growth Curves ◽  
The United States ◽  
Austenitic Steels ◽  
Engineering Society ◽  
Asme Code ◽  
American Society

There are several codes, standards, handbooks, and guidelines for the nuclear power plant maintenance in Japan, the US, and EU. They include Stress Corrosion Cracking (SCC) and fatigue crack growth curves for crack growth calculation. In this paper, the authors selected five kinds of codes, standards and guidelines, and compared their fatigue crack growth curves for choice of the suitable curves. The feature of each curve was quantitatively evaluated. Japan Society of Mechanical Engineers (JSME) maintenance rule and American Society of Mechanical Engineers (ASME) code provide the fatigue crack growth formulae for both ferritic and austenitic steels and consider the environmental effects in some cases. The Fitness-for-Service Network (FITNET) curves are categorized in many kinds of metal, whereas the Forschungskuratorium Maschinenbau (Germany) = Board of Trustees of Mechanical Engineering (FKM) guideline and Welding Engineering Society (WES) procedure provide the common properties generally applicable to steels.

Comparison of Fatigue Crack Growth Curves of Japan, the US and EU Code and Standards

2010 ◽  
Author(s):  
Kiminobu Hojo ◽  
Yukio Takahashi
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Nuclear Power ◽  
Growth Curves ◽  
Austenitic Steels ◽  
The Us ◽  
Asme Code ◽  
Standards And Guidelines ◽  
Crack Growth Curve

There are several code and standards, handbooks and guidelines for the nuclear power plant maintenance in Japan, the US and EU. They include SCC and fatigue crack growth curve for crack growth calculation. In this paper the authors selected five kinds of codes, standards and guidelines and compared their fatigue crack growth curves for choice of the suitable curves. The feature of each curve was summarized quantitatively evaluated. JSME maintenance rule and ASME code provide the fatigue crack growth formulae for both ferritic and austenitic steels and consider the environmental effects in some cases. The FITNET curves are categorized in many kinds of metal whereas the FKM guideline and WES procedure provide the common properties applicable to steels generally.

Review of the Effect of Hydrogen Gas on Fatigue Performance of Steels

2010 ◽  
Author(s):  
Yan Hui Zhang
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Hydrogen Gas ◽  
Fatigue Performance ◽  
Austenitic Steels ◽  
Loading Frequency ◽  
Hydrogen Environment ◽  
Crack Growth Rates

To develop hydrogen energy, it is important to understand the effects of hydrogen on mechanical properties in all applications — production, transportation, storage and fuel cells. Although a considerable amount of work has been carried out on hydrogen related embrittlement, there is comparatively less work on the effect of a hydrogen environment on fatigue performance of steels. It is essential to carry out comprehensive and coordinated research to understand how a component is affected when exposed to a hydrogen environment, how to prevent or minimise the failure probability, and finally to gather critical data to develop design guidance and government regulations to ensure safe operation of infrastructures involving hydrogen environment. The paper reviews the effect of a gaseous hydrogen environment on fatigue endurances and fatigue crack growth rates of steels, identifies the major factors promoting hydrogen effects and reviews the requirements for carrying out fatigue tests in hydrogen environment. The review covers degradation on fatigue performance of many variables including steel grades, ΔK magnitude, hydrogen partial pressure, loading frequency, gas composition, stress ratio, microstructures, base and weld metals and temperature. The mechanisms responsible for the accelerated crack growth rates in hydrogen environment and the implication of the degradation on fatigue design are also discussed. It was found that, unlike hydrogen embrittlement, fatigue performance of steels in hydrogen is degraded in both ferritic and austenitic steels, and in both low and high strength steels. The degradation by hydrogen gas is more pronounced with respect to fatigue crack growth rate than fatigue endurance of steels. Based on the results of the review, recommendations are made with respect to further research work required.

A discrete dislocation analysis of fatigue crack growth

2001 ◽  
Vol 11 (PR5) ◽  
pp. Pr5-69-Pr5-75
Author(s):  
V. S. Deshpande ◽  
H. H.M. Cleveringa ◽  
E. Van der Giessen ◽  
A. Needleman
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Discrete Dislocation

Fatigue Investigation of Elastomeric Structures

2010 ◽  
Vol 38 (3) ◽  
pp. 194-212 ◽  
Author(s):  
Bastian Näser ◽  
Michael Kaliske ◽  
Will V. Mars
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Material Behavior ◽  
Period Effect ◽  
Numerical Representation ◽  
Material Force ◽  
Strain Behavior ◽  
Dissipative Effects ◽  
Elastomeric Materials

Abstract Fatigue crack growth can occur in elastomeric structures whenever cyclic loading is applied. In order to design robust products, sensitivity to fatigue crack growth must be investigated and minimized. The task has two basic components: (1) to define the material behavior through measurements showing how the crack growth rate depends on conditions that drive the crack, and (2) to compute the conditions experienced by the crack. Important features relevant to the analysis of structures include time-dependent aspects of rubber’s stress-strain behavior (as recently demonstrated via the dwell period effect observed by Harbour et al.), and strain induced crystallization. For the numerical representation, classical fracture mechanical concepts are reviewed and the novel material force approach is introduced. With the material force approach at hand, even dissipative effects of elastomeric materials can be investigated. These complex properties of fatigue crack behavior are illustrated in the context of tire durability simulations as an important field of application.

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