A streamline approach to multiaxial fatigue monitoring using virtual sensing

2021 ◽  
Author(s):  
Victor Flores Terrazas ◽  
Omid Sedehi ◽  
Costas Papadimitriou ◽  
Lambros S. Katafygiotis
Keyword(s):  
Multiaxial Fatigue ◽  
Fatigue Monitoring ◽  
Virtual Sensing

Multiaxial fatigue analysis of orthotropic materials

2010 ◽  
Vol 107 (9) ◽  
pp. 369-375 ◽  
Author(s):  
C. Gaier ◽  
B. Unger ◽  
H. Dannbauer
Keyword(s):  
Fatigue Analysis ◽  
Multiaxial Fatigue ◽  
Orthotropic Materials

Assessment of Sylphons Lifetime

2008 ◽  
Vol 59 (5) ◽  
pp. 605-610
Author(s):  
Alexandru Pupazescu ◽  
Stefan Minoiu ◽  
Constantin Manea
Keyword(s):  
Elevated Temperature ◽  
Strain Distribution ◽  
Accurate Determination ◽  
Multiaxial Fatigue ◽  
Tensile Curve

The paper contains an assessment of the sylphons lifetime for multiaxial fatigue. Three criteria were used two based on s � N diagram and one based on energy. For a more accurate determination of the sylphons lifetime the stress and the strain distribution been determined using FEM, the tensile curve of the steel W 4541 at elevated temperature.

Rotor Temperature Virtual Sensing for Induction Machines using a Lumped-Parameter Thermal Network and Dual Kalman Filtering

2021 ◽  
pp. 1-1
Author(s):  
Pieter Nguyen Phuc ◽  
Dimitar Vaskov Bozalakov ◽  
Hendrik Vansompel ◽  
Kurt Stockman ◽  
Guillaume Crevecoeur
Keyword(s):  
Kalman Filtering ◽  
Induction Machines ◽  
Thermal Network ◽  
Lumped Parameter ◽  
Virtual Sensing

Feasibility of modal expansion for virtual sensing in offshore wind jacket substructures

2021 ◽  
Vol 79 ◽  
pp. 103019
Author(s):  
Dawid Augustyn ◽  
Ronnie R. Pedersen ◽  
Ulf T. Tygesen ◽  
Martin D. Ulriksen ◽  
John D. Sørensen
Keyword(s):  
Offshore Wind ◽  
Modal Expansion ◽  
Virtual Sensing

scholarly journals Ultrasonic and thermographic fatigue monitoring on a full-scale CFRP aeronautical component after repairing

2021 ◽  
Vol 1038 (1) ◽  
pp. 012027
Author(s):  
V Dattoma ◽  
R Nobile ◽  
F Palano ◽  
F W Panella ◽  
A Pirinu ◽  
...  
Keyword(s):  
Full Scale ◽  
Fatigue Monitoring

Multiaxial Fatigue of 16MnR Steel

2008 ◽  
Vol 131 (2) ◽  
Author(s):  
Zengliang Gao ◽  
Tianwen Zhao ◽  
Xiaogui Wang ◽  
Yanyao Jiang
Keyword(s):  
Pure Shear ◽  
Ambient Air ◽  
Shear Loading ◽  
Multiaxial Fatigue ◽  
Experimental Results ◽  
Pressure Vessel Steel ◽  
Critical Plane ◽  
Cracking Behavior ◽  
Vessel Steel ◽  
Axial Torsion

Uniaxial, torsion, and axial-torsion fatigue experiments were conducted on a pressure vessel steel, 16MnR, in ambient air. The uniaxial experiments were conducted using solid cylindrical specimens. Axial-torsion experiments employed thin-walled tubular specimens subjected to proportional and nonproportional loading. The true fracture stress and strain were obtained by testing solid shafts under monotonic torsion. Experimental results reveal that the material under investigation does not display significant nonproportional hardening. The material was found to display shear cracking under pure shear loading but tensile cracking under tension-compression loading. Two critical plane multiaxial fatigue criteria, namely, the Fatemi–Socie criterion and the Jiang criterion, were evaluated based on the experimental results. The Fatemi–Socie criterion combines the maximum shear strain amplitude with a consideration of the normal stress on the critical plane. The Jiang criterion makes use of the plastic strain energy on a material plane as the major contributor to the fatigue damage. Both criteria were found to correlate well with the experiments in terms of fatigue life. The predicted cracking directions by the criteria were less satisfactory when comparing with the experimentally observed cracking behavior under different loading conditions.

scholarly journals Optimal Sensor Placement for Reliable Virtual Sensing Using Modal Expansion and Information Theory

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3400
Author(s):  
Tulay Ercan ◽  
Costas Papadimitriou
Keyword(s):  
Utility Function ◽  
Measurement Errors ◽  
Structural Model ◽  
Information Gain ◽  
Sensor Placement ◽  
Optimal Sensor Placement ◽  
Modal Expansion ◽  
Expected Information ◽  
Virtual Sensing ◽  
Multidimensional Integral

A framework for optimal sensor placement (OSP) for virtual sensing using the modal expansion technique and taking into account uncertainties is presented based on information and utility theory. The framework is developed to handle virtual sensing under output-only vibration measurements. The OSP maximizes a utility function that quantifies the expected information gained from the data for reducing the uncertainty of quantities of interest (QoI) predicted at the virtual sensing locations. The utility function is extended to make the OSP design robust to uncertainties in structural model and modeling error parameters, resulting in a multidimensional integral of the expected information gain over all possible values of the uncertain parameters and weighted by their assigned probability distributions. Approximate methods are used to compute the multidimensional integral and solve the optimization problem that arises. The Gaussian nature of the response QoI is exploited to derive useful and informative analytical expressions for the utility function. A thorough study of the effect of model, prediction and measurement errors and their uncertainties, as well as the prior uncertainties in the modal coordinates on the selection of the optimal sensor configuration is presented, highlighting the importance of accounting for robustness to errors and other uncertainties.

scholarly journals Formulation of multiaxial fatigue failure criteria for spectral method

2020 ◽  
Vol 135 ◽  
pp. 105519 ◽  
Author(s):  
Adam Niesłony ◽  
Michał Böhm ◽  
Robert Owsiński
Keyword(s):  
Spectral Method ◽  
Fatigue Failure ◽  
Failure Criteria ◽  
Multiaxial Fatigue

scholarly journals Multiaxial Fatigue Strength to Notched specimens made of 40CrMoV13.9

2016 ◽  
Vol 9 (4) ◽  
pp. 1269-1291 ◽  
Author(s):  
Filippo Berto ◽  
Abedin Gagani ◽  
Raffaella Aversa ◽  
Relly Victoria V. Petrescu ◽  
Antonio Apicella ◽  
...  
Keyword(s):  
Fatigue Strength ◽  
Multiaxial Fatigue ◽  
Notched Specimens
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