scholarly journals High cycle fatigue life estimation of materials processed by laser powder bed fusion

2019 ◽  
Vol 42 (7) ◽  
pp. 1454-1466 ◽  
Author(s):  
Even W. Hovig ◽  
Amin S. Azar ◽  
Martin F. Sunding ◽  
Erik Andreassen ◽  
Knut Sørby
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Life Estimation ◽  
Fatigue Life Estimation

scholarly journals High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion

2018 ◽  
Vol 188 ◽  
pp. 03015 ◽  
Author(s):  
Even W. Hovig ◽  
Amin S. Azar ◽  
Martin F. Sunding ◽  
Knut Sørby ◽  
Mohammed M'hamdi ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Stress Concentration ◽  
Surface Properties ◽  
High Cycle Fatigue ◽  
Material Surface ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Element Analysis ◽  
Powder Bed

Fatigue life is known to be dependent on the surface properties of the material. Surface roughness provokes local stress concentration and cause crack initiation even at minute cyclic loads. In laser powder bed fusion, the as-built surfaces show variable roughness depending on the orientation of the specimens with respect to the build plate. In order to analyse the effect of build angle on surface properties, flat tensile specimens were produced from an AlSi10Mg alloy in a Concept Laser M2 Cusing machine. Seven specimens were arranged from flat to perpendicular with respect to the build plate at 15° intervals. The as-built surface topography of each specimen was characterised by white light interferometry. Two methods for calculating the stress concentration factor for high cycle fatigue simulation were developed. The presence of subsurface porosity was a crucial factor in expanding the stress concentration as demonstrated by finite element analysis.

Mechanisms driving high-cycle fatigue life of as-built Inconel 718 processed by laser powder bed fusion

2019 ◽  
Vol 761 ◽  
pp. 137993 ◽  
Author(s):  
Dillon S. Watring ◽  
Kristen C. Carter ◽  
Dustin Crouse ◽  
Bart Raeymaekers ◽  
Ashley D. Spear
Keyword(s):  
Fatigue Life ◽  
Inconel 718 ◽  
High Cycle Fatigue ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Diesel Engine Crankshaft High Cycle Fatigue Life Estimation and Improvement Through FEA

2016 ◽  
Vol V5 (01) ◽  
Author(s):  
Mr. Suraj K. Kolhe ◽  
Mr. Amit Chaudhari ◽  
Mr. Prafull Ghare ◽  
Dr. J. V. L. Venkatesh ◽  
Keyword(s):  
Fatigue Life ◽  
Diesel Engine ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Life Estimation ◽  
Fatigue Life Estimation ◽  
Engine Crankshaft

Anisotropic high cycle fatigue property of Sc and Zr-modified Al-Mg alloy fabricated by laser powder bed fusion

2021 ◽  
pp. 102514
Author(s):  
Zehao Qin ◽  
Nan Kang ◽  
Mohamed El Mansori ◽  
Zihong Wang ◽  
Haoxiang Wang ◽  
...  
Keyword(s):  
High Cycle Fatigue ◽  
Fatigue Property ◽  
Mg Alloy ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Tensile and Fatigue Properties of Ti-6Al-4V Alloy Fabricated by Laser Powder-Bed Fusion Process

2020 ◽  
Author(s):  
M. Shafiqur Rahman ◽  
Uttam K. Chakravarty
Keyword(s):  
Fatigue Life ◽  
Fatigue Limit ◽  
Fatigue Behavior ◽  
Functional Materials ◽  
Fatigue Properties ◽  
Small Scale ◽  
Powder Bed Fusion ◽  
Cycle Fatigue ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

Abstract The tensile and fatigue properties of laser-powder-bed-fusion (L-PBF) processed Ti-6Al-4V specimens are investigated at different loading conditions. Two types of as-built and post-machined L-PBF processed dogbone specimens are considered for the study, one is an ASTME8M round specimen and the other one is a customized small-scale flat structure. The tensile and fatigue behavior of the specimens are investigated numerically using the finite element (FE) method. The FE modeling considers both low cycle fatigue (LCF) and high cycle fatigue (HCF) test conditions by applying cyclic loads in fully-reversed and stress ratio R = 0.1 conditions. The FE results for the von Mises stress, strain, total deformation, fatigue life, factor of safety, and fatigue limit of the Ti-6Al-4V specimens are obtained at room temperature (295 K). Results obtained from the model show that the fatigue life decreases as the load increases. It is also found that fatigue life does not vary with the change of the test frequency under a specific fatigue load. The comparison of mechanical properties of the L-PBF processed specimens with conventionally manufactured Ti-6Al-4V parts is also shown to understand the differences in the tensile and fatigue behavior. The validation of the FE model is performed by comparing the numerical results for the yield stress and fatigue limit with the experimental results found from the literature. The overall study contains a detailed analysis of the tensile and fatigue behavior of additively manufactured Ti-6Al-4V parts and provides a guide to investigating the similar properties for other functional materials used in the L-PBF process.

Transient Stress Analysis and High Cycle Fatigue Life Estimation of a Gas Turbine Shrouded HP Compressor Blade

2016 ◽  
Author(s):  
Vinayaka Nagarajaiah ◽  
Nilotpal Banerjee ◽  
B. S. Ajay Kumar ◽  
Kumar K. Gowda ◽  
Tulsidas Dalappa
Keyword(s):  
Fatigue Life ◽  
Gas Turbine ◽  
Thermal Stresses ◽  
High Cycle Fatigue ◽  
Structural Integrity ◽  
Resonance Condition ◽  
Cycle Fatigue ◽  
Element Analysis ◽  
Life Estimation ◽  
Fatigue Life Estimation

This work is focused on developing a technique to assess high cycle fatigue of shrouded HP compressor blades subjected to thermo-mechanical loads like centrifugal stresses, vibratory stresses and thermal stresses in a gas turbine rotor. In practice, the blades are also subjected to resonance condition during steady or transient conditions of operation when passing through critical speeds. Hence, shrouds are added initially at 3/4 length along blade height which helps in reducing vibration amplitude by providing suitable stiffness to the blade and hence better structural integrity. Industrial best practice like Campbell diagram is used for the above purpose. Two approaches employed here for fatigue analysis are linear Finite element analysis (FEA) and Elasto-Plastic FEA. Fictive elastic results are recalculated using Neuber’s Rule. Strain amplitude approach is followed and Coffin-Manson Equation is used to determine the number of start-up and shut-down cycles. Design and analysis is performed using ANSYS 14.5 tool for reliable fatigue life estimation and to predict catastrophic failure due to High Cycle Fatigue.

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