industry

Helical Strand in Bending

Several approaches have been used to deal with the complex problem of helical strands in bending. One of them is based on Love’s curved rods theory. It has first been used by Costello in his classical monograph “Theory of Wire Rope”. It has been extended by Sathikh et al. in several papers. A new contribution from this group is a Ph.D. Thesis by D. Gopinath : “Some studies on bending response of the stranded cable under free bending and constrained bending”, Anna University, Chennai (India), October 2013, 121 pages. On line at http://ir.inflibnet.ac.in:8080/jspui/handle/10603/17169


Justification for use of Riks method to investigate gross plastic deformation

Hi, my question is on the use of Riks and other Arc length methods when analysing  a system for gross plastic deformation. ASME B&PV code , in its investigation for Gross plastic deformation as a Load at which convergence does not take place. Now, as far as I understand, Newton Raphson method fails at locations of singularity in the stiffness matrix and also at Bifurcation points, it can trace the unstable primary paths. Both these issues can be overcome ( provided the limit point is not too sharp) by Riks and other Arc length methods. My question is, how do we justify that using Riks and similar methods, we are not forcing a solution even when gross plastic deforation ( in the language of the code, overall structural instability) is taking place?


ON THE POFFENBERGER-SWART STRESS

New test data in a 2013 conference paper. Details in the attached file.


New Open Access journal: Case Studies in Engineering Failure Analysis

Read over 40 open access articles from Case Studies in Engineering Failure Analysis

Case Studies in Engineering Failure Analysis provides a forum for the rapid publication of short, structured Case Studies in Engineering Failure Analysis and related Short Communications, and will provide an essential compendium of case studies for practitioners in the field of engineering failure analysis and others who are interested in the ways in which components fail.

Read the 40+ articles that are live already!


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. Abstract can be read online at www.elsevier.com/locate/engstruct


Dian Mo's picture

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

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.

Please help me in this probem.

Thanks in advance.

 

Best Wishes

Balaji

 

 

 


Dynamic force on a closing mitre gate

      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

A case of conductor fatigue

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 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. App Note: http://www.nanovea.com/Application%20Notes/surface-boundary.pdf


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.


ASOKHIA BENJAMIN MUYIWA's picture

Ranking of top ten accidents based on frequency weights

Ranking of top ten accidents based on frequency weights
ASOKHIA BENJAMIN MUYIWA's picture

Ranking of top ten accidents based on frequency weights

Ranking of top ten accidents based on frequency weights
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


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