High Cycle Fatigue Damage Mechanisms of MAR-M 247 Superalloy at High Temperatures

2016 ◽  
Vol 69 (2) ◽  
pp. 393-397 ◽  
Author(s):  
M. Šmíd ◽  
V. Horník ◽  
P. Hutař ◽  
K. Hrbáček ◽  
L. Kunz
Keyword(s):  
Fatigue Damage ◽  
High Temperatures ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Damage Mechanisms

scholarly journals High cycle fatigue damage mechanisms in cast aluminium subject to complex loads

2013 ◽  
Vol 47 ◽  
pp. 44-57 ◽  
Author(s):  
Imade Koutiri ◽  
Daniel Bellett ◽  
Franck Morel ◽  
Louis Augustins ◽  
Jérôme Adrien
Keyword(s):  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Damage Mechanisms ◽  
Cast Aluminium

scholarly journals Multiaxial high cycle fatigue damage mechanisms associated with the different microstructural heterogeneities of cast aluminium alloys

2016 ◽  
Vol 649 ◽  
pp. 426-440 ◽  
Author(s):  
Viet-Duc Le ◽  
Franck Morel ◽  
Daniel Bellett ◽  
Nicolas Saintier ◽  
Pierre Osmond
Keyword(s):  
Fatigue Damage ◽  
Aluminium Alloys ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Damage Mechanisms ◽  
Cast Aluminium

Tensile and very high cycle fatigue behaviors of a compressor blade titanium alloy at room and high temperatures

2021 ◽  
Vol 811 ◽  
pp. 141049
Author(s):  
Fulin Liu ◽  
Yao Chen ◽  
Chao He ◽  
Lang Li ◽  
Chong Wang ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
High Temperatures ◽  
High Cycle Fatigue ◽  
Compressor Blade ◽  
Cycle Fatigue ◽  
Very High Cycle Fatigue ◽  
Very High

High Cycle Fatigue Damage Evaluation of Steel Pipelines Based on Microhardness Changes During Cyclic Loads: Part II

2018 ◽  
Author(s):  
Geovana Drumond ◽  
Bianca Pinheiro ◽  
Ilson Pasqualino ◽  
Francine Roudet ◽  
Didier Chicot
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Steel Structures ◽  
New Method ◽  
Microplastic Deformation ◽  
Surface Phenomenon ◽  
Cyclic Loads ◽  
Cycle Fatigue ◽  
Indentation Tests

The hardness of a material shows its ability to resist to microplastic deformation caused by indentation or penetration and is closely related to the plastic slip capacity of the material. Therefore, it could be significant to study the resistance to microplastic deformations based on microhardness changes on the surface, and the associated accumulation of fatigue damage. The present work is part of a research study being carried out with the aim of proposing a new method based on microstructural changes, represented by a fatigue damage indicator, to predict fatigue life of steel structures submitted to cyclic loads, before macroscopic cracking. Here, Berkovich indentation tests were carried out in the samples previously submitted to high cycle fatigue (HCF) tests. It was observed that the major changes in the microhardness values occurred at the surface of the material below 3 μm of indentation depth, and around 20% of the fatigue life of the material, proving that microcracking is a surface phenomenon. So, the results obtained for the surface of the specimen and at the beginning of the fatigue life of the material will be considered in the proposal of a new method to estimate the fatigue life of metal structures.

Steel 51CrV4 under high temperatures, short-time creep and high cycle fatigue

2018 ◽  
Vol 147 ◽  
pp. 468-476 ◽  
Author(s):  
Josip Brnic ◽  
Marino Brcic ◽  
Sanjin Krscanski ◽  
Domagoj Lanc ◽  
Jitai Niu ◽  
...  
Keyword(s):  
High Temperatures ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Short Time

The Influence of Microstructure Heterogeneities on the Very High Cycle Fatigue Behavior of Duplex Stainless Steel

2016 ◽  
Vol 258 ◽  
pp. 255-258
Author(s):  
Ulrich Krupp ◽  
Marcus Söker ◽  
Tina Waurischk ◽  
Alexander Giertler ◽  
Benjamin Dönges ◽  
...  
Keyword(s):  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Fatigue Behavior ◽  
Ion Beam ◽  
Cyclic Plasticity ◽  
Cycle Fatigue ◽  
Heterogeneous Distribution ◽  
Very High Cycle Fatigue ◽  
Structural Applications ◽  
Very High

As being used for structural applications, where a high corrosion resistance is required, the fatigue behavior of duplex stainless steels (DSS) is governed by the partition of cyclic plasticity to the two phases, ferrite and austenite, respectively. Under very high cycle fatigue (VHCF) loading conditions, the heterogeneous distribution of crystallographic misorientations between neighboring grains and phases yields to a pronounced scatter in fatigue life, ranging from 1 million to 1 billion cycles for nearly the same stress amplitude. In addition, the relevant damage mechanisms depend strongly on the atmosphere. Stress corrosion cracking in NaCl-containing atmosphere causes a pronounced decrease in the VHCF life. By means of ultrasonic fatigue testing at 20kHz in combination with high resolution scanning electron microscopy, electron back-scattered diffraction (EBSD), focused ion beam milling (FIB) and synchrotron tomography, the microstructure heterogeneities were quantified and correlated with local fatigue damage. It has been shown that the fatigue process is rather complex, involving redistribution of residual stresses and three-dimensional barrier effects of the various interfaces. The application of a 2D/3D finite element model allows a qualitative prediction of the fatigue-damage process in DSS that is controlled by stochastic local microstructure arrangements.

scholarly journals Topology optimization for transversely isotropic materials with high-cycle fatigue as a constraint

2020 ◽  
Vol 63 (1) ◽  
pp. 161-172
Author(s):  
Shyam Suresh ◽  
Stefan B. Lindström ◽  
Carl-Johan Thore ◽  
Anders Klarbring
Keyword(s):  
Topology Optimization ◽  
Fatigue Damage ◽  
High Cycle Fatigue ◽  
Transverse Isotropy ◽  
Transversely Isotropic ◽  
Back Stress ◽  
Optimization Method ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Time Model

AbstractWe propose a topology optimization method for design of transversely isotropic elastic continua subject to high-cycle fatigue. The method is applicable to design of additive manufactured components, where transverse isotropy is often manifested in the form of a lower Young’s modulus but a higher fatigue strength in the build direction. The fatigue constraint is based on a continuous-time model in the form of ordinary differential equations governing the time evolution of fatigue damage at each point in the design domain. Such evolution occurs when the stress state lies outside a so-called endurance surface that moves in stress space depending on the current stress and a back-stress tensor. Pointwise bounds on the fatigue damage are approximated using a smooth aggregation function, and the fatigue sensitivities are determined by the adjoint method. Several problems where the objective is to minimize mass are solved numerically. The problems involve non-periodic proportional and non-proportional load histories. Two alloy steels, AISI-SAE 4340 and 34CrMo6, are treated and the respective as well as the combined impact of transversely isotropic elastic and fatigue properties on the design are compared.

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