Donnerstag, 28. Oktober 2010

Simulation of a bra

Hello Dear readers,
today I want to talk about the use of Finite Elements Method on ... yeah, you read right... a BRA.

The FEM is used to do a stress, flow or temperature analysis of - usually - mechanically components of a machine or something related. By dividing that component in a huge amount of small cubic or triangle elements, the stress problems can be solved.

In a graphical output, the stresses are displayed. Usually, the higher the stress, the color gets more into the reddish side.

The Video above shows such a FEM simulation done on a bra. As you can see, the areas displayed in the blue-ish colors are hardly stressed.
When talking about machine parts, every engineer is trying to save material, as it is one major cost factor in production.

So you may think, why not save material costs in BRA INDUSTRY???

Picture above is me at the beach (with my ex bf cut off, actually)... I'm actually too shy to wear more lean bras or bikinis... though I know now, that most of the cloth used is not necessary!

What do you think of that? Comment please :)

Dienstag, 26. Oktober 2010

Excavator Destruction

Hello Friends,

today I want to introduce you to a real monster, the LIEBHERR R9800.

In that video above - some of you may already know it - it simply destroys a car, using nothing more than  42 tons of water.

Some data about that excavator:

Operating weight
800 - 810 tons

Engine output
2984 kW/4000 PS
(ISO 9249)

Backhoe bucket capacity
42.00 m³ @ 1.8 t/m³

Shovel capacity
42.00 m³ @ 1.8 t/m³

Some more picture (taken directly from LIEBHERR):

Controlling one of these must be great! Making you feel like in Transformers, maybe.

What do you think of it? You'd like one for christmas? ;-)

Montag, 25. Oktober 2010

Sonntag, 24. Oktober 2010

Mortal Kombat 2011

Hi Folks,

today nothing about engineering stuff as i found two stunning videos on that new MK.

Look here:

Trailer 1

Combo Moves Compilation

The Game will be released in early 2011, but only for xbox and PS.
I think it's worth buying one of these gaming consoles then, really took that into consideration!

what do you mean? are you going to buy MK 9?
Comment on that pls!

Samstag, 23. Oktober 2010

Shock resistance of Surface Coatings

This picture shows the zones of failure in an impact situation on coated surfaces.

In the peripheral zone there are the well-known bending-cracks, caused by the stretching of the substrate layer during the plastical deformation caused by the indenter.

In the central zone, the coating material cracks cohesively, thus causing irregular crack structures. This zone is especially large for brittle coating materials, such as (Di-)Chrome Nitride.

The zone in between shows failure of both types mentioned above.

To clear things up: this is sort of the things that make your saws, knifes and razors blunt.

Topic of research is to develop coatings that are very resistant against this kind of wear, as well as against abrasive wear, to keep the perfect quality of the surface for a longer time, thus keeping knifes sharp much longer.

I do really hope to enlighten things a bit. Comment on this, if you like.
Also, tell my your criticism,
what kind of topics would you like me to talk about next time?

Freitag, 22. Oktober 2010

Mobile Cranes

Now a little Teaser to LIEBHERR Mobile Cranse as they can be seen regularly on many construction sites.

The pictures above show the crane "LIEBHERR LTM 11200-9.1". It is the strongest telescope crane in the world atm.
It can lift up to 1200 tons up to 100m height. With an additional spire construction, even up to 226m height.
It is powered by a 500 kW Diesel Engine for driving and a 270 kW Diesel Engine for lifting.

With its 9 axes and 1.50m high wheels it reaches a top speed of 75 km / h.

The attached videos show a Diashow of that crane.

Video 1 @ youtube
Video 2 @ youtube

btw: I very much like the song in the second video :-)

Feel free to comment on this topic, the song or the pictures!

Just4Fun: Engineering Jokes

Just posting something funny for the beginning of the weekend:

An architect, an artist and an engineer were discussing whether it was better to spend time with the wife or a mistress. The architect said he enjoyed time with his wife, building a solid foundation for an enduring relationship. The artist said he enjoyed time with his mistress, because of the passion and mystery he found there. The engineer said, "I like both." "Both?" Engineer: "Yeah. If you have a wife and a mistress, they will each assume you are spending time with the other woman, and you can go to the lab and get some work done."

· MAJOR TECHNOLOGICAL BREAKTHROUGH - Back to the drawing board.
· DEVELOPED AFTER YEARS OF INTENSIVE RESEARCH - It was discovered by accident.
· THE DESIGNS ARE WELL WITHIN ALLOWABLE LIMITS - We just made it, stretching a point or two.
· CUSTOMER SATISFACTION IS BELIEVED ASSURED - We are so far behind schedule that the customer was happy to get anything at all from us.
· CLOSE PROJECT COORDINATION - We should have asked someone else; or, let's spread the responsibility for this.
· THE DESIGN WILL BE FINALIZED IN THE NEXT REPORTING PERIOD - We haven't started this job yet, but we've got to say something.
· A NUMBER OF DIFFERENT APPROACHES ARE BEING TRIED - We don't know where we're going, but we're moving.
· TEST RESULTS WERE EXTREMELY GRATIFYING - It works, and are we surprised!
· EXTENSIVE EFFORT IS BEING APPLIED ON A FRESH APPROACH TO THE PROBLEM - We just hired three new guys; we'll let them kick it around for a while.
· PRELIMINARY OPERATIONAL TESTS ARE INCONCLUSIVE - The darn thing blew up when we threw the switch.
· THE ENTIRE CONCEPT WILL HAVE TO BE ABANDONED - The only guy who understood the thing quit.
· MODIFICATIONS ARE UNDERWAY TO CORRECT CERTAIN MINOR DIFFICULTIES - We threw the whole thing out and are starting from scratch.

In Addition to that, I would simply like to give you the opportunity to choose, into what direction this blog heads... more tech? more fun stuff? mixed thingy? 

Comment pls, I'm glad to read your opinion!!! 


Donnerstag, 21. Oktober 2010

Money talks

This picture shows a chart, which engineering position earns how much money on average, at the beginning of job life.

I really hope that works out for me, too!

Trying to rech that "F&E" stuff, which means science and development, that seems to be best paid, about 40.000€ income per year.

With your support and interest in this blog, i will sure end up in a good job, because I of course do additional research for posting here.

Please wish me the best of luck, feel free to comment!

HM Drills

This picture shows drills made from HM.
They are very hard and resist high temperature, thus allowing a large increase in drilling speed, without overheating.

Especially well-known is the "golden" TiN: it is the most commonly used hard coating for drills today, being used in DIY-home-machines, too.

Some people say, its popularity descended from the well-looking golden color.
Do you think so as well?? Comment on it, if you like.

Mittwoch, 20. Oktober 2010

Engineer > Lawyer!!

Hello everybody,

as of now, no material physics in this post because I'm a bit mad after a discussion with a friend of mine who studies laws and financial.

She was bragging with her studies, told me they were the most important subjects there are at all. Concerning banks, credits and that stuff...

I just told her, without the inventions of engineers, she couldn't even go to court with her car......

What's your opinion? If you had the choice, what would you rather be, lawyer or engineer?

Comment pls, I'm really interested.

Dienstag, 19. Oktober 2010

The inclined Impact Test

The inclined impact test constitutes a new reference to the prediction of the coatings’ impact failure, managing to approach loading stages of coated surfaces in different applications. In this experimental method, the repetitive impacts are applied on an oblique coated surface, which is loaded vertically and tangentially simultaneously. To calculate the occurring stress distribution in the loaded film’s and substrate’s region, an appropriate finite elements method (FEM) simulation is developed, which considers the mechanical elastic–plastic properties of all involved materials. In this way, critical equivalent stresses leading to a coating damage can be determined and moreover, the ratio of tangential to the normal stiffness between film and substrate can be quantified. This magnitude describes the adhesion strength and was further experimentally–analytically determined for coatings deposited on various adherent substrates. With the aid of the coating impact adhesion (CIA) metric, the film adhesion can further be qualitatively characterized and correlated to the film contact stiffness ratio.

I hope you liked the topic. Pls comment on the picture and text if you want.

Which elective next term?

Hey there, these days I have to choose some subjects for next term's university.

I can choose between Advanced Fluid Dynamics(AFD) and Methodical Construction Techniques (MCT).

Which one should I take? Pls comment, what would you take? I'll take that into consideration, as I am actually interested in both topics.

Montag, 18. Oktober 2010

Now talking about measuring a surface coating's thickness using the so called "calotest".

With a ball of steel and diamond suspension as grinder, you grind a calotte into the surface.

Looking at that calotte with a microscope, you will gain a view like the scheme above indicates: two concentrical circles.

By measuring these circles diameters you can calculate the height "h" of the surface:

The total depth of the Calotte T is: 

the depth of the calotte in the substrate t is: 

thus, the height h of the surface is: 

as the radius R of the steel ball is much greater than the diameter of the calotte, this equation can be simplified to: 

If you want me to post more of this topic, feel free to comment on this post.

How a hammer mechanism works

This picture shows a scheme of a hammer mechanism with notched plates as it is typically used in drill hammers.

Part (A) shows the basic position of the hammer mechanism. By turning the upper notched plate, it is lifted from the lower one, thus tensioning a spring in the upper part of the machine. (B)

Further turning of the upper notched plate will cause a release of the saved spring energy. This spring energy is directly converted into kinetic energy. As a result, the drill will move forward, like being hammered while turning.

Using this technique, you can achieve a hammering frequency of up to 200 strikes/second easily.

Any questions or suggestions? Feel free to comment on this.