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Fatigue of Overhead Electrical Conductors

A new paper on  the OEC fatigue problem: “Determination of Early Failure Sources and Mechanisms for Al 99.7% and Al-Mg-Si Alloy Bare Conductors Used in Aerial Transmission Lines”, by S. Karabay and E. Feyzullahoglu. Paper has been accepted for publication in March 2014 in the “Engineering Failure Analysis” journal. Abstract can be found on-line:  http://dx.doi.org/10.1016/j.engfailanal.2013.12.002

CABLE BENDING ANALYSIS THOUGH FEA

Single strand cable (spiral) bending and OEC (Overhead Electrical Conductor) bending are somewhat similar problems. This is the reason why the following new paper is noteworthy within the context of this blog. It emanates from a Slovak team: S. Kmet, E. Stanova, G. Fedorko, M. Fabian, J. Brodniansky. Title : “Experimental investigation and finite element analysis of a four-layered spiral strand bent over a curved support”. Published in “Engineering Structures”, Vol. 57, December 2013, pp. 475-483.

Simulation Thermal Mechanics of PCB with Vias Using Ansys

Hi, I am new to this blog & asking for help from you! If any one know that Ansys has 3D composite element that we can use to simulate PCB with Metal Vias (In-plan Fiber glass & epoxy & Out of Plan Metal Cylinders. Tx

Failure Criteria

Choose a channel featured in the header of iMechanica: 

Hello Friends,

I am struggling to correlate FEA results with experimental
results. I work on polymer parts reinforced with glass fibers. I have stress
strain curves for the material till failure. My FEA results are 50% off from
the experimental results. The model is setup correctly.

Bending of cables : a stick-slip model

Bending of cables and, for that matter, of any helical strand system (such as overhead electrical conductors) is a challenging solid mechanics problem, with geometry and multibody frictional contact aspects. As seen in several recent papers, one workable approach is based on Coulomb’s laws of friction.  An earlier contribution by Lehanneur (1949), published in French, has generally been  ignored. The attached report presents a translation into English (including a presentation) of this most interesting work.

J Integral calculation for an Axisymmetric Problem with crack in Ansys

Hi all,

I am working on Crack growth analysis of Turbocharger wheel and shaft assembly. I have simulated it as an axisymmetric problem with fine mesh around the cracktip(in Ansys). Element used is Plane182.

I have to compare the K1 and K2 values obtained from both the Displacement Extrapolation Method and J-Interal method. 

I got the K1 an K2 values at the cracktip location by defining path using displacement extrapolation method.

But, I was not able to get the Stress intensity factor values (K1 nad K2) using J-Integral Method.

Dynamic force on a closing mitre gate

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      I'm looking at the design forces acting on a vertically hinged mitre gate for flow control in a canal, (open channel flow).  We know the maximum volumetric flow rate of the water flow when the gate is closing.  How can I estimate the maximum force exerted on the gate as the water causes it to slam shut.  

Overhead Electrical Conductors and High Intensity Wind

Effect of tornadoes on electrical power lines has been discussed by Sébastien Langlois in his M.Eng. thesis : “Design of Overhead Transmission Lines subject to Localized High Intensity Wind”. McGill University, Montreal, QC, Canada, 2007 (available on-line on the “Theses Canada” portal). Work presents various national and international standards (ASCE, Cigré, IEC etc.), historical cases, as well as models for numerical simulation.

Aeolian vibrations and fatigue of Overhead Electrical Conductors

An interesting presentation of the state of the question by  Dr Louis Cloutier, in 2008.

A case of conductor fatigue

Taxonomy upgrade extras: 

Overhead Electrical Conductors

As a follow-up, here is a photograph of a (rather extreme) case of conductor fatigue.

link 8, introduced tensile curve and compression curve

 

Hi.

I'm working  with the element link8 (Ansys 12.1) and I have to introduced the tensile curve and compression curve, but I don't know, How I have to introduced its???

 

I have worked with the comands: TB: aniso, miso,..., I think the best option is: TB, user, but How I have to introduced the values of tensile and compression curve?, when this are different.

 File attachment is the tensile and compression curve to introduce

Thank you, Toni 

NANOVEA's picture

Surface Boundary Measurement Using 3D Profilometry

In profilometer studies where the interface of surface features, patterns, shapes etc., are being evaluated for orientation, it will be useful to quickly identify areas of interest over the entire profile of measurement. By segmenting a surface into significant areas the user can quickly evaluate boundaries, peaks, pits, areas, volumes and many others to understand their functional role in the entire surface profile under study.

Henry Tan's picture

Topic 70: Take a break, relax

I saw that every 2 or 3 minutes came out a new post. Tomorrow is the deadline, and you are all crazy! Take a break and have some free chat.

Rovshan's picture

Dropped pipe from PLS

Facts

Whilst picking up a joint of drill pipe with the PLS, the jaws opened,

and the pipe fell approximately 3 meters to the drill floor.

The red zone was enforced with barriers. There were no personnel

within the barriered off area. The pipe was recovered, with no damage to

the machinery, and the operation was continued after a TOFS.

Causes

An investigation team was sent from onshore, so we are awaiting the

outcome of that investigation. We can say it was observed that the jaw

function had been selected to ‘open’ and this may have happened when the

Abiaziem Davidson's picture

Topic 69: The essence of performing FMEA and FMECA in Safety and Risk Management

Failure Modes and Effects Analysis (FMEA) is an inductive method of performing a system reliability or safety analysis from a low to a high level. It is a Bottom Up approach in which the analyst looks in turn at each system component, assesses the effects of its failure on system behaviour.
The basic FMEA technique is to:
i. Examine each component in turn
ii. Identify ways in which it can fail (Failure Modes)
iii. Identify the consequence of these failures (failure Effects)

victor.adukwu's picture

Topic 68: Discuss Body Mechanics and use of Tools in an Offshore Drilling Platform

Body mechanics describes how your body moves. Being aware of and practicing good body mechanics throughout your day may help prevent injury and reduce strain on your body. Whether you're sitting at a desk all day or working on a drilling platform, you can practice and improve your body mechanics to help prevent stress and pain and reduce wear and tear on your muscles, tendons, ligaments and joints.

Catriona Ogg's picture

Topic 67: Discuss the safety aspects associated with using divers in offshore operations

 Using divers in offshore operations carries significant risks.  The environment presents a number of hazards such as poor lighting, restricted oxygen supply and sometimes extreme temperatures or pressures.  Discuss these risks and the safety measures in place to help reduce them.  

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