Comment on the Effect of Proof Stress on Notched Fatigue Strength

1963 ◽  
Vol 67 (636) ◽  
pp. 798-799
Author(s):  
E. R. Welbourne
Keyword(s):  
Heat Treatment ◽  
Experimental Investigation ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Elastic Stress ◽  
Proof Stress ◽  
Fatigue Data ◽  
Reversed Loading ◽  
Predicted Values

In his note, Forrest compares the results of an experimental investigation of the notched fatigue strength of HE 15 aluminium alloy (L.64/L.65 type) in three conditions of heat treatment with predicted values obtained using the analysis by Gunn. This analysis appears in R.Ae.S. Fatigue Data Sheets A.00.01 and .02.The analysis requires a minimum knowledge of four parameters, Kt’ the elastic stress concentration factor, ft the tensile strength, ƒp the 0·1 per cent proof stress and Sao the fatigue strength under reversed loading for the specified endurance Ncycles.

Influence of Stress Concentration on Fatigue Property of Welded Joints of 5083 Aluminum Alloy

2013 ◽  
Vol 456 ◽  
pp. 451-455
Author(s):  
Jun Yang ◽  
Bo Li ◽  
Qiang Jia ◽  
Yuan Xing Li ◽  
Ming Yue Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Welded Joints ◽  
Weld Zone ◽  
Fatigue Property ◽  
Concentration Coefficient ◽  
5083 Aluminum Alloy ◽  
Stress Concentration Coefficient

Fatigue test of the welded joint of 5083 aluminum alloy with smooth and height of specimen and the weld zone than the high test measurement and theoretical stress concentration coefficient calculation, the weld reinforcement effect of stress concentration on the fatigue performance of welded joints. The results show that: Smooth tensile strength of specimens for 264MPa, fatigue strength is 95MPa, the tensile strength of the 36%. Higher tensile strength of specimens for 320MPa, fatigue strength is 70MPa, the tensile strength of the 22%. Higher specimen stress concentration coefficient is 1.64, the stress concentration to the weld toe becomes fatigue initiation source, and reduces the fatigue strength and the fatigue life of welded joints.

scholarly journals Relationships among the Microstructure, Mechanical Properties, and Fatigue Behavior in Thin Ti6Al4V

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Y. Fan ◽  
W. Tian ◽  
Y. Guo ◽  
Z. Sun ◽  
J. Xu
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Fatigue Strength ◽  
Laser Welding ◽  
Fracture Strength ◽  
Fatigue Behavior ◽  
Fatigue Properties ◽  
Proof Stress ◽  
Martensite Microstructure

The microstructures of Ti6Al4V are complex and strongly affect its mechanical properties and fatigue behavior. This paper investigates the role of microstructure on mechanical and fatigue properties of thin-section Ti6Al4V sheets, with the aim of reviewing the effects of microstructure on fatigue properties where suboptimal microstructures might result following heat treatment of assemblies that may not be suited to further annealing, for example, following laser welding. Samples of Ti6Al4V sheet were subjected to a range of heat treatments, including annealing and water quenching from temperatures ranging from 650°C to 1050°C. Micrographs of these samples were inspected for microstructure, and hardness, 0.2% proof stress, elongation, and fracture strength were measured and attributed back to microstructure. Fractography was used to support the findings from microstructure and mechanical analyses. The strength ranking from high to low for the microstructures of thin Ti6Al4V sheets observed in this study is as follows: acicularα′martensite, Widmanstätten, bimodal, and equiaxed microstructure. The fatigue strength ranking from high to low is as follows: equiaxed, bimodal, Widmanstätten, and acicularα′martensite microstructure.

A Note on the Effect of Proof Stress on the Notched Fatigue Strength of the Aluminium Alloy HE 15

1963 ◽  
Vol 67 (633) ◽  
pp. 596-598 ◽  
Author(s):  
P. G. Forrest
Keyword(s):  
Fatigue Strength ◽  
Stress Concentration ◽  
Aluminium Alloy ◽  
Stress Conditions ◽  
Proof Stress ◽  
Aged Material ◽  
Aircraft Structures ◽  
Heat Treated

SummaryThe notched fatigue strength of the aluminium alloy HE 15, under stress conditions similar to those occurring in aircraft structures, is greater when the material is naturally aged than when it is fully heat-treated. This is attributed to the lower proof stress of the naturally aged material, which enables the high stresses in regions of stress concentration to relax more readily. However, no further improvement was obtained by re-solution-treating the alloy to reduce the proof stress further.

123 Effect of Heat Treatment Conditions on Static Tensile Strength and Fatigue Strength in Carbon Tool Steel SK85

2007 ◽  
Vol 2007 (0) ◽  
pp. 45-46
Author(s):  
Anggit MURDANI ◽  
Chobin MAKABE ◽  
Kazuo KUNIYOSHI ◽  
Tatsjiro MIYAZAKI ◽  
Toshiyasu SUEYOSHI
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Fatigue Strength ◽  
Tool Steel ◽  
Treatment Conditions ◽  
Static Tensile

Effect of inclusion on performance of A6N01 aluminum alloy joints

2020 ◽  
Vol 10 (9) ◽  
pp. 1395-1403
Author(s):  
Mengyu Ding ◽  
Min Yu ◽  
JunWei Hua ◽  
Hui Chen
Keyword(s):  
Tensile Strength ◽  
Aluminum Alloy ◽  
Fatigue Strength ◽  
Stress Concentration ◽  
Aluminum Alloys ◽  
Base Metal ◽  
Tensile Loading ◽  
Loading Process ◽  
Tensile Fatigue

In order to study the effect of inclusion on performance of A6N01 aluminum alloy joints, the N-A6N01 and C-A6N01 aluminum alloys with different inclusion in amount and size were compared. Results show that the larger inclusions in amount and size in the N-A6N01 joint cause more pronounced degradation in the tensile strength than the C-A6N01 joint. However, the N-A6N01 joint shows a superior fatigue strength to the C-A6N01 under the tensile fatigue, this probably because the degradation in the tensile strength contributes a uniform performance mating between the base metal and WM, which reduces the stress concentration during the tensile loading process, and thus improving the fatigue strength.

VASCOMAX T-300

Alloy Digest ◽  
1990 ◽  
Vol 39 (12) ◽  
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Tensile Strength ◽  
High Temperature ◽  
Heat Treating ◽  
Vacuum Arc ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Vacuum Arc Remelting ◽  
Temperature Performance

Abstract VASCOMAX T-300 is an 18% nickel maraging steel in which titanium is the primary strengthening agent. It develops a tensile strength of about 300,000 psi with simple heat treatment. The alloy is produced by Vacuum Induction Melting/Vacuum Arc Remelting. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-454. Producer or source: Teledyne Vasco.

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