An Investigation of the Cyclic Fatigue and Final Fracture Behavior of a Titanium Alloy

2008 ◽  
Vol 378-379 ◽  
pp. 271-298 ◽  
Author(s):  
T.S. Srivatsan ◽  
Mithun Kuruvilla ◽  
Lisa Park
Keyword(s):  
Titanium Alloy ◽  
Fatigue Life ◽  
Fracture Behavior ◽  
Stress Amplitude ◽  
Load Ratio ◽  
Cyclic Fatigue ◽  
Cyclic Stress ◽  
Fatigue Properties ◽  
Final Fracture ◽  
Stress Load

In this technical manuscript the cyclic stress amplitude controlled fatigue properties and fracture behavior of an emerging titanium alloy (referred to by its designation as ATI 425TM by the manufacturer) is presented and discussed. The alloy was provided as rod stock in the fully annealed condition. Test specimens of the as-received alloy were cyclically deformed under total stress amplitude control at two different stress ratios (R = 0.1 and R = 0.3) with the purpose of establishing the conjoint and mutually interactive influences of magnitude of cyclic stress, load ratio and intrinsic microstructural effects on cyclic fatigue life, final fracture behavior and viable mechanisms governing failure at the microscopic level. The high cycle fatigue resistance of this titanium alloy is described in terms of maximum stress, load ratio, and maximum elastic strain. The final fracture behavior of the alloy under cyclic loading conditions is discussed in light of the mutually interactive influences of intrinsic microstructural features, magnitude of cyclic stress, load ratio and resultant fatigue life.

An Investigation of the High Cycle Fatigue and Final Fracture Behavior of Aluminum Alloy 2219

2008 ◽  
Vol 378-379 ◽  
pp. 207-230 ◽  
Author(s):  
T.S. Srivatsan ◽  
Satish Vasudevan ◽  
Lisa Park ◽  
R.J. Lederich
Keyword(s):  
Fatigue Life ◽  
Fracture Behavior ◽  
High Cycle Fatigue ◽  
Stress Amplitude ◽  
Load Ratio ◽  
Cyclic Stress ◽  
Cycle Fatigue ◽  
Final Fracture ◽  
Stress Load ◽  
Microstructural Effects

In this research paper, the cyclic stress amplitude controlled fatigue response and fracture behavior of an Al-Cu (Aluminum Association designation 2219) is presented and discussed. The alloy was provided as a thin sheet in the T62 temper in the fully anodized condition. A small quantity of the as-provided sheet was taken and the surface carefully prepared to remove the thin layer of anodized coating. Test specimens of the alloy, prepared from the two sheets (anodized and non-anodized), were cyclically deformed under stress amplitude control at two different load ratios with the primary objective of establishing the conjoint influence of magnitude of cyclic stress, load ratio and intrinsic microstructural effects on cyclic fatigue life and final fracture characteristics. The high cycle fatigue resistance of the alloy is described in terms of maximum stress, load ratio, and microstructural influences on strength. The final fracture behavior of the alloy sheet is discussed in light of the concurrent and mutually interactive influences of intrinsic microstructural effects, deformation characteristics of the alloy microstructure, magnitude of cyclic stress, and resultant fatigue life.

The High Cycle Fatigue and Fracture Behavior of Friction Stir Welded Aluminum Alloy 2024

2008 ◽  
Vol 378-379 ◽  
pp. 175-206 ◽  
Author(s):  
T.S. Srivatsan ◽  
Satish Vasudevan ◽  
Lisa Park ◽  
R.J. Lederich
Keyword(s):  
Fatigue Life ◽  
Fracture Behavior ◽  
High Cycle Fatigue ◽  
Stress Amplitude ◽  
Tensile Ductility ◽  
Cyclic Stress ◽  
Cycle Fatigue ◽  
Friction Stir ◽  
Final Fracture ◽  
Microstructural Effects

In this research paper, the cyclic stress amplitude controlled fatigue response and fracture behavior of an Al-Cu-Mg alloy (Aluminum Association designation 2024) is presented and discussed. The alloy was friction stir welded in the T8 temper to provide two plates one having high tensile ductility and denoted as Plate A and the other having low tensile ductility and denoted as Plate B. Test specimens of the alloy, prepared from the two plates, were cyclically deformed under stress amplitude control at two different load ratios with the primary objective of documenting the conjoint influence of magnitude of cyclic stress, load ratio and intrinsic microstructural effects on cyclic fatigue life and final fracture characteristics. The high cycle fatigue resistance of the alloy is described in terms of maximum stress, R-ratio, and microstructural influences on strength. The final fracture behavior of the friction stir welded alloy is discussed in light of the concurrent and mutually interactive influences of intrinsic microstructural effects, deformation characteristics of the alloy microstructure, magnitude of cyclic stress, and resultant fatigue life.

Influence of Carbon Nanotubes and Processing on Cyclic Fatigue and Final Fracture Behavior of a Magnesium Alloy

2011 ◽  
Vol 410 ◽  
pp. 3-16
Author(s):  
Tirumalai S. Srivatsan ◽  
C. Godbole ◽  
Muralidharan Paramsothy ◽  
Manoj Gupta
Keyword(s):  
Carbon Nanotubes ◽  
Fatigue Life ◽  
Magnesium Alloy ◽  
Fracture Behavior ◽  
High Cycle Fatigue ◽  
Load Ratio ◽  
Cyclic Fatigue ◽  
Unreinforced Alloy ◽  
Cycle Fatigue ◽  
Percent Improvement

Carbon nanotubes (CNT)-reinforced magnesium alloy (AZ31) was fabricated using the technique of solidification processing followed by hot extrusion. Test specimens of both the composite and the unreinforced alloy were cyclically deformed at two different load ratios spanning tension-tension loading (R = 0.1) and fully-reversed tension-compression (R= -1) loading under total stress amplitude-control. A comparison of the CNT reinforced magnesium alloy with the unreinforced counterpart revealed well over two hundred percent improvement in cyclic fatigue life at load ratio of 0.1 and about two-hundred and fifty percent improvement in the high cycle fatigue life under conditions of fully-reversed loading [R= -1.0]. At all values of maximum stress, the high cycle fatigue response of both the reinforced and unreinforced magnesium alloy was found to degrade at the lower load ratio (-1.0). The synergistic and interactive influences of reinforcement and processing on microstructural development, cyclic fatigue life and kinetics governing fracture behavior are presented and briefly discussed.

The Effects of Machined Workpiece Surface Integrity on the Fatigue Life of TC21 Titanium Alloy

2012 ◽  
Vol 503-504 ◽  
pp. 382-389 ◽  
Author(s):  
Dong Xing Du ◽  
Dao Xin Liu ◽  
Yu Feng Sun ◽  
Jin Gang Tang ◽  
Xiao Hua Zhang
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Fatigue Life ◽  
Surface Integrity ◽  
Surface Profile ◽  
Fatigue Properties ◽  
Profile Measurement ◽  
Micro Hardness ◽  
Finish Turning ◽  
Rough Turning

In this paper, the influence of different machining methods (including rough turning, finish turning, and longitudinal polishing after finish turning) on rotating bending fatigue properties of TC21 which belonged to a new ultra high strength titanium alloy was studied. The influence of machining methods on surface integrity of TC21 titanium alloy was measured by using surface profile measurement, scanning electron microscopy, metallography microscope, micro-hardness instrument and X-ray diffraction residual stress analyzer. And fatigue fractography of specimens was further investigated. Then the mechanism of fatigue resistance which was affected by machining surface integrity was discussed. The results indicated that the fatigue life of finish turning and longitudinal polishing after finish turning was increased 3.96 times and 17.34 times compared with rough turning, respectively. The machining surface integrity had important influence on fatigue property of TC21 titanium alloy, which caused by the differences of surface roughness and texture as the dominant factors, and then the variation in surface micro-hardness, metallographic microstructure and the surface residual stress were not the main factors on three above-mentioned machining methods. By using longitudinal polishing after finish turning processing method for preparation of TC21 titanium alloy parts could ensure good surface integrity and excellent fatigue performance.

The cyclic fatigue and final fracture behavior of aluminum alloy 2524

2002 ◽  
Vol 23 (2) ◽  
pp. 129-139 ◽  
Author(s):  
T.S Srivatsan ◽  
D Kolar ◽  
P Magnusen
Keyword(s):  
Aluminum Alloy ◽  
Fracture Behavior ◽  
Cyclic Fatigue ◽  
Final Fracture

The Influences of Cutting Speed on the Fatigue of Titanium Alloy

2007 ◽  
Vol 10-12 ◽  
pp. 742-746
Author(s):  
Guo Sheng Geng ◽  
Jiu Hua Xu
Keyword(s):  
Titanium Alloy ◽  
Electron Microscope ◽  
High Speed ◽  
Cutting Speed ◽  
Cyclic Stress ◽  
Fatigue Properties ◽  
Stress Strain ◽  
Ta15 Titanium Alloy ◽  
Cutting Speeds ◽  
Scanning Electron

This research is concerned with the influences of cutting speed on the fatigue properties of high speed milled Ti-6.5Al-2Zr-1Mo-1V (TA15) titanium alloy. Four different cutting speeds ranging from 50 to 200m/min were used to mill the specimens for fatigue test, and the fatigue properties of them were studied at two stress levels: 80—800MPa and 90—900MPa. The fatigue lives of the specimens milled under different cutting speeds were compared. The fracture surfaces were analyzed using scanning electron microscope (SEM), and cyclic stress-strain properties of TA15 titanium alloy were investigated with a stress-strain gauge. The results showed that increasing cutting speed can help to improve the fatigue properties of titanium alloy, especially at a relatively low cyclic stress level.

A Statistically Load-Weighted Probabilistic Fatigue Life Model

2008 ◽  
Vol 44-46 ◽  
pp. 51-56 ◽  
Author(s):  
Li Yang Xie ◽  
Wen Qiang Lin
Keyword(s):  
Fatigue Life ◽  
Stress Amplitude ◽  
Random Variable ◽  
Cyclic Stress ◽  
General Situation ◽  
Statistical Average ◽  
Underlying Principle ◽  
Model Configuration ◽  
System Of Units ◽  
Life Model

By interpreting traditional stress-strength interference model as a statistical average of the probability that strength (a random variable) is greater than stress (another random variable) over its whole distribution range, the same model configuration, which was conventionally applied only to the case of same system-of-units parameters (e.g., stress and strength, both are measured in MPa), was applied to more general situation of different system-of-units parameters. That is to say, the traditional model was extended to more general situations of any two variables, as long as one of the variables can be expressed as a function of the other. Further more, the probabilistic fatigue life under random stress can be predicted, with known probabilistic fatigue lives under several deterministic cyclic stress amplitudes and known distribution of the random cyclic stress amplitude. The underlying principle is that the fatigue life under random stress is equal to the statistical average of the fatigue lives under cyclic stress of deterministic amplitudes which can be considered as the samples of the random stress.

The quasi-static and cyclic fatigue fracture behavior of an emerging titanium alloy

2013 ◽  
Vol 2 (6) ◽  
pp. 348-355 ◽  
Author(s):  
Kannan Manigandan ◽  
Tirumalai S. Srivatsan ◽  
Gregory N. Morscher
Keyword(s):  
Titanium Alloy ◽  
Fatigue Fracture ◽  
Fracture Behavior ◽  
Cyclic Fatigue ◽  
Fatigue Fracture Behavior
Sign in / Sign up

Export Citation Format

Share Document