The influence of spot overlap and laser flence on the high cycle fatigue (HCF) strength of aircraft engine fan blades

2004 ◽  
Author(s):  
Magdi N. Azer ◽  
Doug Scheidt
Keyword(s):  
High Cycle Fatigue ◽  
Aircraft Engine ◽  
Cycle Fatigue ◽  
Hcf Strength

Structural Design and Analysis of Cylindrical Squirrel Cage to Meet Stiffness, Strength and High Cycle Fatigue Life for an Aero Engine

2017 ◽  
Author(s):  
Senthil Kumar Kandhaswamy Srinivasan ◽  
Nazar Periarowthar
Keyword(s):  
Fatigue Life ◽  
Structural Design ◽  
High Cycle Fatigue ◽  
Aircraft Engine ◽  
Squeeze Film ◽  
Cycle Fatigue ◽  
Squeeze Film Damper ◽  
Squirrel Cage ◽  
Fillet Radius ◽  
Goodman Diagram

Squeeze film dampers have traditionally been used in aircraft engine to overcome stability and vibration problems that are not adequately handled with conventional style bearings. One of the key design features in a squeeze film damper [1] configuration is the introduction of flexibility in the bearing support. The simplest means to provide the support flexibility in the squeeze film damper is through the use of squirrel cage [2]. This paper deals with structural design analysis of cylindrical squirrel cage of an aircraft engine. Design of the squirrel cage needs a balance between stiffness and strength requirements. To meet the strength, stiffness and fatigue life requirements, squirrel cage web dimensions and fillet radius are modified. The various configurations of the squirrel cage have been evaluated to arrive at the optimum design. Stress analysis of the bearing has been carried out for axial, radial unbalance loads. Stress distribution in the web region has been studied in detail. High cycle fatigue life margins are estimated using Goodman diagram. The squirrel cage web dimensions and fillet radius are modified to improve HCF life requirements. The operating stresses in the squirrel cage are reduced while meeting the stiffness and HCF life requirements of the component.

Study on Tensile and High Cycle Fatigue Properties of TiC Particle Reinforced Titanium Matrix Composite

2007 ◽  
Vol 546-549 ◽  
pp. 1535-1540 ◽  
Author(s):  
Li Ying Zeng ◽  
Yong Qing Zhao ◽  
Xiao Nan Mao ◽  
Yun Lian Qi
Keyword(s):  
Matrix Composite ◽  
High Cycle Fatigue ◽  
Load Ratio ◽  
Fatigue Tests ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Titanium Matrix ◽  
Titanium Matrix Composite ◽  
Tic Particle ◽  
Hcf Strength

Tensile and high cycle fatigue (HCF) property for TiC particle reinforced titanium matrix composite has been studied in this paper. The results indicated that the composite possessed favorite comprehensive properties. The tensile properties for the composite are superior to that of the common high temperature titanium alloys, e.g. IMI834, Ti-1100. Smooth axial fatigue tests were taken at a frequency of 76Hz with a load ratio R of 0.06 and –1, respectively. And HCF strength for the composite at ambient temperature is 595MPa and 494MPa, respectively.

Influence of Post-ECAP TMT on Mechanical Properties of the Wrought Magnesium Alloy AZ80

2008 ◽  
Vol 584-586 ◽  
pp. 858-863 ◽  
Author(s):  
Julia Müller ◽  
Miloš Janeček ◽  
Lothar Wagner
Keyword(s):  
Magnesium Alloy ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Cast Material ◽  
Ecap Processing ◽  
Size Refinement ◽  
Novel Technique ◽  
Wrought Magnesium Alloy ◽  
Thermo Mechanical Treatment ◽  
Hcf Strength

It is well-known that the high-cycle fatigue (HCF) performance of severe plastically deformed wrought magnesium alloys is not as good as one might expect from the significant grain size refinement. Although enhanced HCF strength after ECAP as compared to as-cast material was observed its value was significantly lower than after conventional extruding. The present investigation was undertaken to determine whether the relatively poor HCF strength of the ECAP processed wrought magnesium alloy AZ80 is associated with the ECAP-induced unfavorable crystallographic textures. Post-ECAP thermo-mechanical treatment (TMT) was found to result in favorable texture modifications as well as in markedly improved HCF performance. The proposed novel technique consists of a not yet used combination of severe plastic deformation via ECAP followed by a 1-step swaging process. It is shown that the resulting combination of both ultrafinegrain sized material and beneficial crystallographic texture results in superior HCF performance not achievable by ECAP-processing alone.

High Cycle Fatigue and Fatigue Crack Propagation Behaviors of Modified A7075-T73 Alloy

2014 ◽  
Vol 52 (4) ◽  
pp. 283-291 ◽  
Author(s):  
Gwan Yeong Kim ◽  
Kyu Sik Kim ◽  
Joong Cheol Park ◽  
Shae Kwang Kim ◽  
Young Ok Yoon ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Cycle Fatigue ◽  
Cycle Fatigue
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