An Investigation on Piston Pin Seat Fatigue Life on the Mechanical Fatigue Experiments

2006 ◽  
Vol 324-325 ◽  
pp. 527-530 ◽  
Author(s):  
Yong Qi Liu ◽  
Yan Xia Wang ◽  
Xiu Hua Men ◽  
Feng Hua Lin
Keyword(s):  
Fatigue Life ◽  
Iterative Algorithm ◽  
Fatigue Behavior ◽  
Experimental Results ◽  
Strain Response ◽  
Stress Strain ◽  
Elastic Plastic ◽  
Mechanical Fatigue ◽  
Modified Formula

Mechanical fatigue experiments are performed for piston pin seat, and the stress-strain response of the piston overall structure is analyzed by the elastic-plastic FEA. An estimated formula of the fatigue life is put forward by amending the Manson-Coffin formula on the basis of studying the fatigue behavior of piston pin seat. The Newton iterative algorithm is applied to calculate the modified formula, and the mechanical fatigue life of piston pin seat is obtained. By comparison the predicted value with the experimental results, the feasibility of estimated formula is validated.

Thermo-Mechanical Fatigue Life of Coke Drum Skirt Attachment Designs

2016 ◽  
Author(s):  
Gurumurthy Kagita ◽  
Balaji Srinivasan ◽  
Penchala Sai Krishna Pottem ◽  
Gudimella G. S. Achary ◽  
Subramanyam V. R. Sripada
Keyword(s):  
Fatigue Life ◽  
Low Cycle Fatigue ◽  
Effective Strain ◽  
Analysis Model ◽  
Transfer Coefficients ◽  
Elastic Plastic ◽  
Mechanical Fatigue ◽  
Section Viii ◽  
Thermocouple Temperature ◽  
Transient Thermal

Skirt to bottom head attachments of coke drums experience severe thermo-mechanical cyclic stresses, causing failures due to low cycle fatigue. Accordingly, many skirt attachment designs have evolved over a period of time starting with simple conventional weld build up design, improved weld build up design, integral forged attachment design and others. The objective of this paper is to compare thermo-mechanical fatigue life of three different skirt attachment designs using elastic-plastic fatigue assessment methods of ASME Section VIII, Division 2. A transient thermal analysis model is first developed incorporating appropriate boundary conditions. The time-dependent variable heat transfer coefficients at the inner surface of the coke drum, which change with the operation stages and the levels of oil filling and water quenching, are determined based on the field measured thermocouple temperature data on the outer surface of the coke drum. Sequentially coupled elastic-plastic transient thermo-mechanical stress analyses of coke drum skirt attachments are carried out using both Twice Yield and cycle-by-cycle methods. The effective strain ranges and the fatigue life of three different skirt attachment designs are calculated and compared.

A Study on Fatigue Behavior of SM490A Steel under Low Temperature

2007 ◽  
Vol 353-358 ◽  
pp. 142-145 ◽  
Author(s):  
Ki Weon Kang ◽  
Byeong Choon Goo ◽  
J.H. Kim ◽  
Heung Seob Kim ◽  
Jung Kyu Kim
Keyword(s):  
Fatigue Life ◽  
Low Temperature ◽  
Test Temperature ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Static Strength ◽  
Experimental Results ◽  
Railway Vehicle

This paper deals with the fatigue behavior and its statistical properties of SM490A steel at various temperatures, which is utilized in the railway vehicle. For these goals, the tensile ad fatigue tests were performed by using a servo-hydraulic fatigue testing machine at three temperatures: +20°C, -10°C and -40°C. The static strength and fatigue limits of SM490A steel were increased with decreasing of test temperature. The probabilistic properties of fatigue behavior are investigated by means of probabilistic stress-life (P-S-N) curve and they are well in conformance with the experimental results regardless of temperature. Also, based on P-S-N curves, the variation of fatigue life is investigated and as the temperature decreases, the variation of fatigue life increases moderately.

scholarly journals Significant Fatigue Life Enhancement in Multiscale Doubly-Modified Fiber/Epoxy Nanocomposites with Graphene Nanoplatelets and Reduced-Graphene Oxide

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2135
Author(s):  
Mohammad Rafiee ◽  
Somayeh Hosseini Rad ◽  
Fred Nitzsche ◽  
Jeremy Laliberte ◽  
Michel R. Labrosse
Keyword(s):  
Graphene Oxide ◽  
Fatigue Life ◽  
Reduced Graphene Oxide ◽  
Composite Laminates ◽  
Fatigue Behavior ◽  
Cost Effective ◽  
Mechanical Analysis ◽  
Graphene Nanoplatelets ◽  
Experimental Results ◽  
Reduced Graphene

We report the fatigue behavior of a novel multiscale fiberglass/epoxy composite modified with reduced-graphene oxide (rGO) and graphene nanoplatelets (GNP). A novel and cost-effective fabrication method based on vacuum assisted resin transfer molding (VARTM) method was used for manufacturing the composite laminates. Morphological and mechanical analysis of composites showed a successful dispersion of nano-fillers and a remarkable improvement in fatigue life of the nanocomposites. The experimental results revealed that all rGO concentrations resulted in a significant increase in fatigue life of the nanocomposites. These enhancements can be explained by the creation of stronger links between the nanoparticles fiberglass and epoxy. The experimental results also showed that lower concentrations of GNPs lead to an increase in fatigue life of nanocomposites; however, a decrease in their fatigue life can be seen at higher loadings.

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