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Automation vs. Manual Control in Concrete Testing

Concrete is one of the most widely used materials around the world. The construction industry is often involved in a wide array of testing which requires a variety of testing equipment. In addition to simple compression testing, testing standards such as ASTM C39, ASTM C109, ASTM C469, ASTM C1609 are among the test methods that can be followed to measure the mechanical properties of a concrete specimen. This blog post covers the mechanical testing of concrete in lab environments, its automation, and ways of achieving it.

Mechanical Testing of Concrete

Automotive Interior- Mechanical Testing

Aesthetics and material durability are closely related in consumer-facing industries such as the automotive industry. In addition to designing an aesthetically pleasing interior environment, developers aim to create an interior with durable components to stand up to long-term use. This blog post covers the different mechanical tests used to ensure automotive interior parts pass the test for aesthetics, quality, safety, and durability.

Pedestrian bridge collapse in Florida

http://www.nzherald.co.nz/world/news/article.cfm?c_id=2&objectid=12013879

Does anyone know more about the causes of that collapse?

Now that we supposedly know so much about mechanics, why does a small-span bridge like that collapse?  

It it because we are optimizing prematurely based on false confidence in numerical models?

-- Biswajit

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The 7th edition of the International Conference on Fatigue of Composites (ICFC7)

The 7th edition of the International Conference on Fatigue of Composites is going to be held in Vicenza (Italy) from 4th to 6th of July 2018. The conference is organized by the Department of Management and Engineering at the University of Padova, under the patronage of the European Society for Composite Materials, the Committee on Composite Materials of the Japan Society of Material Science, the Italian Association for Stress Analysis and the Italian Group of Fracture.

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Certification for Damage Tolerance

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I wonder if anyone in Imechanica follows or deals with Damage Tolerance of Aircraft Structures.  Not having to deal with everyday certification nor having direct experience, I know only what is reported in academic books, but I am confused about what is the standard in industry and certification, assuming there is one!

 

SUMMARIES OF AIRCRAFT LIFING CONCEPTS

 

Safe-Life design

Overhead Electrical Conductors: Louis Cloutier's legacy

I have been asked to give more details on Dr Cloutier's contribution to the field of overhead electrical conductors (power transmission lines) mechanics. I just received the attached document, written by one close colleague of his, Dr. Claude Hardy, who retired from IREQ, Hydro-Quebec research branch. A nice tribute to Louis Cloutier's legacy.

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Durability of photovoltaic laminates: mechanical, economical and societal impacts

Mechanicians interested in interdisciplinary research on composites for photovoltaic energy applications, please download the free reports for policy makers and photovoltaic companies published by the Task 13 of the International Energy Agency: 

http://mailchi.mp/c40cfc488823/iea-pvps-newsletter-pv-power-update-39?e=...

 

The ERC Starting Grant CA2PVM is glad to have contributed to this outreach activity, see:

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.

CABLE UNDER AXIAL LOADING: AN ANALYTICAL MODEL

The classical problem of a cable under axial load has been revisited by Weiguo Wu and Xin Cao: Mechanics model and its equation of wire rope based on elastic thin rod theory, International Journal of Solids and Structures, in press, 9 pages. On line 22 october 2016 at http://www.sciencedirect.com/science/article/pii/S0020768316303122 .

Model is applied to a multistrand ccable given in a book by Costello (1990). Axial stiffness results compare very well.   

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A treasury of college works

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OVERHEAD ELECTRICAL CONDUCTORS IN BENDING : A SEMI-CONTINUOUS MODEL

As indicated in the review by Cardou & Jolicoeur (1997), and depending on the application, a helically stranded system may be modelled using a semi-continuous approach whereby each layer is replaced by a continuous helical orthotropic material. For those able to read Russian, this approach is presented in a paper by Danilin & Al. specifically oriented towards Overhead Electrical Conductor mechanics: “Modelling of Deformation of Wire Spiral Structures” published in the PNRPU Mechanics Bulletin (2015, No 4, pp.

OVERHEAD ELECTRICAL CONDUCTORS IN BENDING : NEW TEST DATA

A paper by Kubelwa et al. (Statistical Modelling of Bending Stress in ACSR Overhead Transmission Line Conductors subjected to Aeolian Vibrations –I) reports data from vibration tests on 4 ACSR.  under  3 axial loads (20, 25 and 30% UTS). An 84.5 m conductor span is vibrated at various bending amplitudes and strain is measured near a clamped end (distance not given). Clamps are rigid square-faced bushings. Vibration amplitude is measured at 89 mm from bushing. Strain gages are glued on 3 adjacent top layer wires.

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Asking for help in BAJA SAE Car

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Hello,I've joined a racing contest for Off-Road cars , called Baja SAE ( Society of Automotive Engineers)

The car contains tubes that are welded together or attached together by flanges

I am familiar with Abaqus and ANSYS btw

What are the main aspects that we should consider in modeling and simulating a baja sae car ?
BAJA SAE Car to be made

Can you help me with this?

Overhead Electrical Conductor in bending: Papailiou's model revisited

 In a paper to appear and available online,( An analytical approach to model the hysteretic bending behavior of spiral strands, Applied Mathematical Modeling 2016, http://www.sciencedirect.com/science/article/pii/S0307904X16300592 )

Cable bending stiffness: new test data

A new paper by Chen et al.: Experimental research on bending performance of structural cable. In: Construction and Building Materials, 15 October 2015, Vol. 96, pp. 279-288. Equivalent bending stiffness has been obtained applying a force at midspan of simply supported, about one meter long, specimens. A number of tensile force levels have been applied (including zero). Non-linear force-deflection curves are shown.

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.

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Seismic Evaluation of Petroleum Storage Tank

I´m doing a plastic collapse evaluation as per API 579-1 Appendix B1, and one of the load cases is Earthquake loads. 579 refers to ASCE 7, which for tanks refers to API 650 Appendix E. The approach in 650 is a static equivalent lateral force seismic analysis where you find equivalent lateral forces and moments according to some likely earthquake spectrum. It seems that what you do is apply these at the top of the tank shell, which mimics the overturning and shear behavior, assuming the tank doesnt slide from inertia. 

How to calculate Impedance (Electrical output variables) in a basic Piezoelectric modelling

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Hello All,

I am a relatively new user to Abaqus. I am working on piezoelectric steady state dynamic analysis of a transducer. Currently I only have a cuboid piezo transducer. My main aim now is to get the Impedance values for a given input voltage. I am exciting the transducer at a frequency of 1 kHz. I would use the relation of Z = Input voltage / Output current.

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A cable bending stick-slip analytical model

Single strand cable bending, stick-slip, analytical models require that a choice be made between two contact modes between adjacent wires: either radial (between layers) or lateral (between same layer wires). In most recent models (e.g. Papailiou’s) radial contact is selected. A “lateral contact” model has been presented by Panetti in 1944 and can be found in the proceedings of the Turin Royal Academy of Science. A translated version from Italian is proposed in the attached file.

Reservoir Modeler. Eclipse to Abaqus. Geomechanical Coupling

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Hello, Everybody, who is studing reservoir geomechanics,

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The Cable Connection – Choosing the Perfect Lifeline for Your Machines

With the availability of different brands and grades of cables in the market, it can be pretty challenging to narrow down the options to a few good ones. As with several other things related to wires, a high price tag or big brand name doesn’t actually help in making the right selection. Instead, one has to look out for particular characteristics and specifications for picking the right cable.

Helical Strand Mechanics Modelling

Some 2014 papers on the mechanics of helical strands: cables and electrical conductors

Cable FEA modelling

A 2014 paper on cable FEA modelling

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