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Fatigue

Mike Ciavarella's picture

Susmel-Papuga sharp controversy about multiaxial fatigue criteria

I recently came across this sharp controversy between Papuga and Susmel on multiaxial fatigue criteria.  Papuga accuses Susmel of "picking up" data that he likes from the literature, disregarding other data... And of having some constants in the criteria that are set a posteriori as fitting parameters.   Do you know how this ended up?  Anyone else partecipated to the debate? 

 Comments on “A survey on evaluating the fatigue limit under multiaxial loading” by Jan...

In Memoriam: Dr Louis Cloutier (1936-2017)

My friend and former colleague, Dr. Louis Cloutier, passed away on February 26. A long time Hydro-Quebec engineer, among other achievements, he will be remembered for his major contribution to the solution of electric power transmission mechanical problems, most notably to Aeolian vibration control, and related conductor fatigue.

Mike Ciavarella's picture

A simple finding on variable amplitude (Gassner) fatigue SN curves obtained using Miner’s rule for unnotched or notched specimen

We provide a very simple result for a problem which has been often neglected (variable amplitude loading) in academia, but which is of paramount importance in real engineering situations, where fatigue is almost never "constant amplitude".

We found few cases where we could check this extremely simple result, but it worked very well.  We would welcome further verifications.

The paper is in press here.

1 PhD and 2 Postdoc positions in composites and 3D printed materials @ Ghent University (Belgium)

One PhD (4 years) and two Postdoc (3 years) vacancies are available in the composites research group at Ghent University in Belgium. The different open positions deal with nondestructive testing methods for composites inspection (vibration/thermography) and fatigue of 3D printed metals. More information can be found on http://www.composites.ugent.be/PhD_job_vacancies_PhD_job_positions_compo....

Which theory Abaqus' Contour Integral for the determination of SIFs is based on?

I am actually using Abaqus' Contour Integral for the determination of stress intensity factors. But I do not know, which theory it is based on. Is it the same like the path-independent determination of J integral? Or is there a difference?

Lazuardi Pujilaksono's picture

Fatigue crack propagation

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Hi, I'm trying to perform a supposedly-simple experiment on fatigue crack propagation of UHMWPE. I use a compact-tension specimen on a servopulser hidraulic testing machine. I will try to do the experiment on a fix Pmax with a varied force ratio (R) from 0.1 to 0.5. I'm having trouble in deciding the maximum force Pmax. How does one decide the amount of force applied for FCP testing? Calculation steps and so on.

WCFA2016-VFA – Workshop on Vibration Fatigue Analysis

Dear iMechanicians,

I would like to inform you about the workshop WCFA2016-VFA, which is this year organized with the focus set on Vibration Fatigue Analysis. The workshop will be held at the Czech Technical University in Prague, Czech Republic from November 8 to November 10, 2016. The introductory lessons in the first day will be presented by Prof Darrell Socie, Prof Milan Ruzicka and Dr Jan Papuga, while the main topic - Vibration Fatigue Analysis - will follow in next two days and will be covered by Dr Neil Bishop.

Nine papers about fatigue modelling of short fiber composite

Recently, we have published a series of nine papers about modelling fatigue and damage in short fiber composites.  Together, they provide a complete description of modelling of such materials including wavy fiber composites; starting from appropriate homogenization method to component level fatigue simulation. Discussion and feedback on the papers is welcome.

Call for Papers // Fatigue Durability India 2016 // Publishing Partner Springer

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FatigueDurability India 2016 invites technical papers from all Academicians/ individuals/companies associated with engineering design, analysis, testing, instrumentation, research on Fatigue Durability & Fracture Mechanics or related technologies .

The Authors are encouraged to submit paper on the following themes, but not limited to

Call for Papers // Fatigue Durability India 2016 // Publishing Partner Springer

Choose a channel featured in the header of iMechanica: 

FatigueDurability India 2016 invites technical papers from all Academicians/ individuals/companies associated with engineering design, analysis, testing, instrumentation, research on Fatigue Durability & Fracture Mechanics or related technologies .

The Authors are encouraged to submit paper on the following themes, but not limited to

PhD/RA position in Nonlinear Dynamics Laboratory @ the University of Rhode Island

The nonlinear dynamics laboratory at the University of Rhode Island has an open position for a PhD student supported through research assistantship (including tuition remittance) starting Summer or Fall 2016. This position is supported by NSF grant. This research has a multidisciplinary nature incorporating material science, dynamical systems modeling, fatigue testing, and nonlinear time series analysis.

Simpleware Webinar: Automotive Applications, Tuesday Nov 24 2015

Simpleware for Automotive Webinar

Tuesday Nov 24, 2015 - 8:00am-9:00am GMT (London)

Tuesday Nov 24, 2015 - 5:00pm-6:00pm GMT (London)

Register: http://ow.ly/UsVso 

Emilio Martínez Pañeda's picture

XVIII International Colloquium on Mechanical Fatigue of Metals (ICMFM XVIII) - Abstract submission open

Dear Colleagues,


It is a great pleasure to contact you again to give you some new details about the XVIII International Colloquium on Mechanical Properties of Metals (ICMFM18), to be held in Gijón (Spain), from September 5th to 7th of 2016.

 

Postdoctoral Research Scholar at Sichuan University and Chengdu University, China

Applications are invited for a 24 months fixed term Postdoc/Research Associate post to work as part of the NSFC project “Fatigue damage mechanism and life prediction in bone using 3D micro-CT image correlation techniques”. 

PhD vacancy (4 years) on multi-scale fatigue damage modelling of unidirectional fibre-reinforced composites @ Ghent University (Belgium)

The core idea of this fundamental research project is to develop a consistent multi-scale modelling framework for fatigue damage in unidirectionally reinforced composites. Three scales are distinguished: (i) the micro-scale, where individual fibre filaments are arranged in a polymer matrix.

PhD vacancy (4 years) on simulation and testing of short fibre-reinforced composites for application in heat exchangers @ Ghent University (Belgium)

Almost all heat exchangers are currently made of metal. A few attempts have been made to make heat exchangers from (fibre-reinforced) polymers. Switching from metal to polymer/composite can have several advantages:

Overhead Electrical Conductor fatigue testing: a new standard

The International Electrotechnical Commission (IEC) just released a new international standard titled: "Overhead lines - Method for fatigue testing of conductors". IEC 62568. Edition 1.0 2015-07. www.iec.ch . It closely follows previous CIGRE and EPRI publications on this topic:

CIGRE SC B2 WG11 TF7 "Fatigue Endurance Capability of Conductor/Clamp Systems - Update of Present Knowledge" CIGRE TB 332, 2007, Paris.

Post-Doctoral Researcher - Fatigue/Fracture of Materials

DEPARTMENT:  Department of Energy

AGENCY:  National Energy Technology Laboratory

LEVEL:  Post-Doctoral

POSITION INFORMATION:  Temporary, 12 months full-time with the possibility of extension

DUTY LOCATION:  Albany, Oregon

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