scholarly journals FATIGUE RESISTANCE OF RC SLABS OVERLAID WITH THE SFRC DETERMINED FROM FATIGUE TESTS UNDER RUNNING WHEEL LOADS

2010 ◽  
Vol 64 (1) ◽  
pp. 493-500
Author(s):  
Dai NEMOTO ◽  
Tadashi ABE ◽  
Tetsukazu KIDA ◽  
Atsuya KOMORI
Keyword(s):  
Fatigue Resistance ◽  
Fatigue Tests ◽  
Running Wheel ◽  
Rc Slabs

Effect of Plasma Cutting on the Fatigue Resistance of Fe510 D1 Steel

1999 ◽  
Vol 122 (1) ◽  
pp. 141-145 ◽  
Author(s):  
M. Chiarelli ◽  
A. Lanciotti ◽  
M. Sacchi
Keyword(s):  
Fatigue Resistance ◽  
Low Carbon Steel ◽  
Physical And Mechanical Properties ◽  
Research Programme ◽  
Fatigue Tests ◽  
Automatic Process ◽  
Plasma Cutting ◽  
Low Carbon ◽  
The University

The paper describes the results of a research programme, carried out at the Department of Aerospace Engineering of the University of Pisa, for the assessment of the influence of plasma cutting on the physical and mechanical properties of Fe510 D1, a low carbon steel widely used in carpentry. The activity started by observing that several industries rework plasma cut edges, particularly in the case of fatigue structures, in spite of the good quality of the plasma cut edges in a fully automatic process. Obviously, reworking is very expensive and time-consuming. Comparative fatigue tests demonstrated that the fatigue resistance of plasma cut specimens in Fe510 steel was fully comparable to that of milled specimens, as the consequence of the beneficial residual stresses which formed in the plasma cut edges. [S0094-4289(00)02201-5]

scholarly journals Contribution In Determining The Fatigue Endurance of Slide Diamond Burnishing AISI52100 Steel Components

2021 ◽  
Author(s):  
Ouahiba Taamallah ◽  
Hamid Hamadache ◽  
Abdelaziz Amirat ◽  
Ouzine Boussaid
Keyword(s):  
Fatigue Resistance ◽  
Maximum Stress ◽  
High Stress ◽  
Ultimate Tensile Stress ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Diamond Burnishing ◽  
Slide Diamond Burnishing ◽  
Fatigue Endurance ◽  
Good Agreement

Abstract The present paper is an investigation on the effect of slide diamond burnishing on the fatigue endurance of a component made of AISI52100 steel. Burnishing operation has been performed on cylindrical specimens using optimal parameters statistically selected such as burnishing force, burnishing feed and number of tool passes. Bending fatigue tests in air at R= -1 and S-N curves have been plotted by incrementing the applied stress from a maximum stress level of about 66% of the ultimate tensile stress to a stress value below which fatigue does not occur. Results show that slide diamond burnishing has increased the fatigue resistance comparing to unburnished specimens. The fatigue endurance is respectively 222 MPa and 190 MPa. At high stress levels, the fatigue resistance improvement is clearly observed and the fatigue trends are in good agreement with those reported in literature. However, the present results are slightly lower and that is attributed to the shoulder fillet value of the specimen. For small fillet radius, fatigue resistance is lowered.

scholarly journals Effect of As-Built and Ground Surfaces on the Fatigue Properties of AlSi10Mg Alloy Produced by Additive Manufacturing

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1432
Author(s):  
Julius Noel Domfang Ngnekou ◽  
Yves Nadot ◽  
Gilbert Henaff ◽  
Julien Nicolai ◽  
Lionel Ridosz
Keyword(s):  
Surface Roughness ◽  
Fatigue Resistance ◽  
Roughness Parameter ◽  
Load Ratio ◽  
Fatigue Tests ◽  
Defect Size ◽  
Fatigue Properties ◽  
Size Analysis ◽  
Powder Bed ◽  
Laser Process

The present work concerns the influence of surface (machined, as-built) on the fatigue resistance of AlSi10Mg produced by a powder-bed laser process. The competition between defects and surface roughness is assessed by using Kitagawa-type diagrams. Samples are printed along three directions: 0°, 45° and 90°. After axial fatigue tests with a load ratio of R = −1, all the fracture surfaces are carefully analysed. The initiation sites can be (i) a defect, (ii) the surface roughness, (iii) the surface ripple. The results indicate that ground surfaces lead to the same fatigue life as as-built surfaces. It is also shown that T6 treatment improves the fatigue resistance. However, when specimen surfaces are as-built or ground, it is difficult to correlate the fatigue results with ‘isolated defect size analysis’ neither roughness parameter for an as-built surface. Therefore, microstructure, residual stresses or multiple initiation should be further analysed to understand the results.

Influence of Martensitic Transformation on the Fatigue of Low Temperature Metastable Stainless Steel

2016 ◽  
Vol 869 ◽  
pp. 405-410
Author(s):  
Sergio Neves Monteiro ◽  
Verônica Scarpini Cândido ◽  
Luis Carlos da Silva ◽  
Frederico Muylaert Margem
Keyword(s):  
Stainless Steel ◽  
Martensitic Transformation ◽  
Low Temperature ◽  
Fatigue Resistance ◽  
Fatigue Tests ◽  
Type Stainless Steel ◽  
Cold Worked ◽  
Aisi 316 ◽  
Number Of Cycles

The influence of martensitic transformation on the fatigue of AISI 316 type stainless steel, which presents a low temperature metastable behavior, was investigated at-196 and 25°C. Fatigue tests were conducted on both annealed and cold worked conditions. The results from stress versus number of cycles curves showed that the fatigue resistance is not affected by the “dynamically” induced martensite in annealed specimens at both temperatures. On the contrary, the previously induced “static” martensite in work hardened specimens contributes to decrease the fatigue resistance limit. The contribution of the martensite stability is discussed.

scholarly journals Fatigue Resistance Models of Structural for Risk Based Inspection

2020 ◽  
Vol 6 (2) ◽  
pp. 375-383
Author(s):  
Sergei Belodedenko ◽  
V. Hanush ◽  
A. Baglay ◽  
О. Hrechanyі
Keyword(s):  
Fatigue Resistance ◽  
Influence Factors ◽  
High Strength ◽  
Technical Condition ◽  
Damage Function ◽  
Fatigue Tests ◽  
Structural Elements ◽  
Model Combining ◽  
Safety Margins ◽  
Complex Indicators

The current stage of civil engineering is characterized by special attention to the safety of structures with a long service life. Such objects were designed several decades ago and their safe operation was ensured by significant safety margins. Now this approach to safety has been replaced by the concept of acceptable risk. It forms the basis of a risk based inspection (RBI) maintenance strategy. The transition from preventive maintenance strategies to a technical condition maintenance is substantiated. Complex indicators of technical condition, suitable for RBI- maintenance, are considered. The methodology of the resource safety index (RSI) is proposed. The latter is used as an indicator of risk. Special models of fatigue resistance is required for its control. The purpose of this paper is to build fatigue models for critical structural elements that are serviced according to the RBI concept. Instead of the traditional S-N curve, the lifetime general equation (first model) be used, where by the arguments are the main influence factors. Along with this, a modified ε - N equation is proposed for deformation criteria. The novelty of this equation is that it uses the rate of S-N- curve (slope) obtained in the first model with high cycle fatigue. The second model, combining the results of fatigue tests, is the equation for the dispersion of durability. The third model is the accumulated damage function under overloads. The efficiency of the RSI method is demonstrated by the example of the reliability assessment of the high strength bolts. Thanks to RSI method forecasting, during RBI-maintenance, parts can be used 3-5 times longer than with traditional methods.

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