scholarly journals Probabilistic fatigue-life assessment model for laser-welded Ti-6Al-4V butt joints in the high-cycle fatigue regime

2018 ◽  
Vol 116 ◽  
pp. 22-35 ◽  
Author(s):  
Fedor Fomin ◽  
Manfred Horstmann ◽  
Norbert Huber ◽  
Nikolai Kashaev
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Assessment Model ◽  
Life Assessment ◽  
Cycle Fatigue ◽  
Butt Joints ◽  
Fatigue Life Assessment

Transition From Low Cycle to High Cycle in Uniaxial Fatigue

2013 ◽  
Author(s):  
Mohamed E. M. El-Sayed
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Uniaxial Stress ◽  
Life Assessment ◽  
Elastic Behavior ◽  
Cycle Fatigue ◽  
Fatigue Life Assessment ◽  
Component Development

Fatigue is the most critical failure mode of many mechanical component. Therefore, fatigue life assessment under fluctuating loads during component development is essential. The most important requirement for any fatigue life assessment is knowledge of the relationships between stresses, strains, and fatigue life for the material under consideration. These relationships, for any given material, are mostly unique and dependent on its fatigue behavior. Since the work of Wöhler in the 1850’s, the uniaxial stress versus cycles to fatigue failure, which is known as the S-N curve, is typically utilized for high-cycle fatigue. In general, high cycle fatigue implies linear elastic behavior and causes failure after more than 104 or 105 cycles. However. the transition from low cycle fatigue to high cycle fatigue, which is unique for each material based on its properties, has not been well examined. In this paper, this transition is studied and a material dependent number of cycles for the transition is derived based on the material properties. Some implications of this derivation, on assessing and approximating the crack initiation fatigue life, are also discussed.

Biaxial high-cycle fatigue life assessment of ductile aluminium cruciform specimens

2014 ◽  
Vol 73 ◽  
pp. 82-90 ◽  
Author(s):  
R.A. Cláudio ◽  
L. Reis ◽  
M. Freitas
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Life Assessment ◽  
Cycle Fatigue ◽  
Fatigue Life Assessment

Fatigue Life Assessment for NPS30 Steel Pipe

2012 ◽  
Author(s):  
Jorge Silva ◽  
Hossein Ghaednia ◽  
Sreekanta Das
Keyword(s):  
Fatigue Life ◽  
Test Data ◽  
Crack Depth ◽  
Research Work ◽  
Longitudinal Crack ◽  
Assessment Model ◽  
Life Assessment ◽  
Fatigue Life Assessment ◽  
Remaining Fatigue Life ◽  
Crack Defect

Pipeline is the common mode for transporting oil, gas, and various petroleum products. Aging and corrosive environment may lead to formation of various defects such as crack, dent, gouge, and corrosion. The performance evaluation of field pipelines with crack defect is important. Accurate assessment of crack depth and remaining fatigue life of pipelines with crack defect is vital for pipeline’s structural integrity, inspection interval, management, and maintenance. An experimental based research work was completed at the University of Windsor for developing a semi-empirical model for estimating the remaining fatigue life of oil and gas pipes when a longitudinal crack defect has formed. A statistical approach in conjunction with fracture mechanics was used to develop this model. Statistical analysis was undertaken on CT specimen data to develop this fatigue life assessment model. Finite element method was used for determining the stress intensity factor. The fatigue life assessment model was then validated using full-scale fatigue test data obtained from 762 mm (30 inch) diameter X65 pipe. This paper discusses the test specimens and test data obtained from this study. Development and validation of the fatigue life assessment model is also presented in this paper.

OS0713 Low Cycle Fatigue life Assessment for Notched Specimen Using FEM Analysis

2011 ◽  
Vol 2011 (0) ◽  
pp. _OS0713-1_-_OS0713-2_
Author(s):  
Shengde ZHANG ◽  
Masao Sakane
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Fem Analysis ◽  
Life Assessment ◽  
Cycle Fatigue ◽  
Notched Specimen ◽  
Fatigue Life Assessment

scholarly journals A method for low-cycle fatigue life assessment of metallic materials under multiaxial loading

2008 ◽  
Vol 40 (1) ◽  
pp. 48-51 ◽  
Author(s):  
S. Shukaev ◽  
M. Gladskii ◽  
A. Zakhovaiko ◽  
K. Panasovskii
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Life Assessment ◽  
Multiaxial Loading ◽  
Metallic Materials ◽  
Cycle Fatigue ◽  
Fatigue Life Assessment

OS0706 Low Cycle Fatigue Life Assessment of Ni-base Single Crystal Superalloy Under Combined Tensile and Torsional Loadings at High Temperature

2008 ◽  
Vol 2008 (0) ◽  
pp. _OS0706-1_-_OS0706-2_
Author(s):  
Nobuhiro ISOBE ◽  
Morio YORIKAWA ◽  
Noriaki MATSUDA ◽  
Akira YOSHINARI ◽  
Masao SAKANE
Keyword(s):  
High Temperature ◽  
Fatigue Life ◽  
Single Crystal ◽  
Low Cycle Fatigue ◽  
Life Assessment ◽  
Single Crystal Superalloy ◽  
Cycle Fatigue ◽  
Fatigue Life Assessment

Low-cycle fatigue life assessment for gas turbine engine disks under flight cycle conditions

2009 ◽  
Vol 41 (1) ◽  
pp. 102-105 ◽  
Author(s):  
K. D. Karimbaev ◽  
A. N. Servetnik
Keyword(s):  
Fatigue Life ◽  
Gas Turbine ◽  
Low Cycle Fatigue ◽  
Gas Turbine Engine ◽  
Life Assessment ◽  
Cycle Fatigue ◽  
Turbine Engine ◽  
Fatigue Life Assessment

scholarly journals Integral treatment of butt joints for the fatigue life assessment in the low cycle fatigue regime

2020 ◽  
Author(s):  
Benjamin Möller
Keyword(s):  
Fatigue Life ◽  
Life Assessment ◽  
Cyclic Behavior ◽  
Cycle Fatigue ◽  
Stress Strain ◽  
Butt Joints ◽  
Variable Amplitude Loading ◽  
Fatigue Assessment ◽  
Variable Amplitude ◽  
Integral Treatment

Abstract The framework for a fatigue assessment of welded joints under service loading conditions of crane structures from the low cycle to the high cycle fatigue regime includes the consideration of elastic-plastic material behavior, variable amplitude loading, and acceptable calculation times. Therefore, an integral treatment of butt joints has been developed for fatigue life estimation. The butt weld is considered in its entirety, so that it can be described by its cyclic behavior. The evaluation of the cyclic stress-strain behavior and tri-linear strain-life curves of butt joints for different high-strength, fine-grained structural steels, derived by strain-controlled fatigue tests, is the basis for this description. This procedure is not limited to conventionally applied gas metal arc welding only, but also the fatigue assessment of laser beam welding is possible, for example. Cyclic transient effects have been analyzed and a distinctive cyclic softening is described by linearization of Ramberg-Osgood parameters, depending on the damage content of each cycle derived from constant amplitude, strain-controlled tests. On the basis of the cyclic behavior in combination with memory and Masing behavior, a simulation of the stress-strain paths of investigated butt welds, under constant and variable amplitude loading, has been performed. Damage parameters are used to accumulate the damage cycle by cycle in order to derive the fatigue lifetime. Finally, calculated fatigue lives were compared with experimentally determined lives, showing the impact of this procedure.

C203 STUDY ON LOW CYCLE FATIGUE LIFE ASSESSMENT WITH SAFETY CONFIDENCE OF LARGE STEAM TURBINE COMPONENTS

2003 ◽  
Vol 2003.2 (0) ◽  
pp. _2-185_-_2-188_
Author(s):  
Jing yuan SHI ◽  
Yu YANG ◽  
Qing SUN ◽  
Xian yue HU
Keyword(s):  
Fatigue Life ◽  
Steam Turbine ◽  
Low Cycle Fatigue ◽  
Life Assessment ◽  
Cycle Fatigue ◽  
Fatigue Life Assessment
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