Crazy Engineers .CoM

Thursday, November 17, 2011

Posted: 16 Nov 2011 11:08 PM PST

I need to give a seminar on bearing capacity in interference fit with compression and shear loads. I am working on it. Can somebody help me get related Information..

Thankyou all.

Bonneville Speed Demon @ 462 MPH!!

Posted: 16 Nov 2011 10:33 PM PST

Quote:Watch the Speed Demon make a 462 mph pass at Bonneville from many different angles in and around the car. Awesome! endquote

What Does 462 MPH Feel Like? - Autoholics

Shot Peen Hardness With Nanoindentation

Posted: 16 Nov 2011 08:59 PM PST

The intention of shot peening is ultimately to alter the mechanical properties of a given surface. By hitting the surface with controlled shot the surface will deform plastically. Two of the more common techniques include cast sheet shot and cut wire shot. Cut wire shot is created by cutting drawn steel wire to lengths approximately the same size as the width of the wire. The resulting wire is then rounded to remove the sharp edges. Cast steel shot is created by atomizing molten steel, then heat treating and sieving the resulting material. In both cases, the surface of the material is hit with a controlled energy of shot to create the desired effect. Understanding the mechanical properties of the surface reactions created by these techniques is becoming increasingly important in various applications including medical, aerospace and automotive industries. Proper Instrumentation will play a vital factor in achieving reliable and intended results.

APPLICATION NOTE: http://www.nanovea.com/Application%20Notes/shotpeen-nanoindentation.pdf

Wednesday, November 16, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

project ideas

Posted: 16 Nov 2011 03:14 PM PST

:)can some one please tell me any good projects on incompressible flows and the application of finite element method in fluid mechanics?

Pedal-Powered (Vacuum) Zeolite Refrigerator

Posted: 15 Nov 2011 10:08 PM PST

This project seem very interesting
Pedal-Powered (Vacuum) Zeolite Refrigerator - YouTube
any tried it before ? i was just wondering if i can replace the Zeolite to just simple silica gel where i can get it easily .

Tuesday, November 15, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Strength of Material question

Posted: 15 Nov 2011 02:32 AM PST

Hi all,

I found following two questions in a book; the solutions has confused me. Pleas help with the correct approach:

1.a steel rod 20 mm dia is passed through a brass tube of 25mm internal dia and 30 mm external dia. the tube is 80 cm long and is closed by thin rigid washers and fastened by nuts, screwed to the rod. the nuts are tightened until the compressive force in the tube is 5kN. cal the stresses in the rod and tube.

Es = 200 GPa; Eb= 80 GPa

2. a steel bolt of 16 mm dia passes centrally through a copper tube of internal dia 20 mm and external dia 30 mm. the length of the whole assembly is 500 mm. after tight fitting of the assembly, the nut is overtightened by quarter of a turn. what are the stresses induced in the nut and the bolt if pitch of nut is 2mm.

Es = 200 GPa ; Ec = 120 GPa

the key difference in the approach according to the book is that, for the first problem the elongation in rod and compression in tube is taken to be same.however for the second problem,the degree of elongation and compression is not taken equal. is approach correct for the second qtn ?

Requesting an urgent response!

Regards!!

CrazyEngineers Forum - Other Engineering Trades

No more huffin' and puffin' in gridlocked traffic - Just fly on your personal Puffin

Posted: 15 Nov 2011 07:30 AM PST

NASA - The Puffin: A Passion for Personal Flight

Return of the Airship - Multibody Advanced Airship for Transport (MAAT)

Posted: 14 Nov 2011 10:13 PM PST

Airships are poised (They can poise literally unlike airplanes) to come back. If all goes well. Air transport can see a radical change to the advantage of the environment.

High society: a new airship paradigm | In-depth | The Engineer

Monday, November 14, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

What sensors can measure the horizontal and vertical speed of a ball

Posted: 14 Nov 2011 11:38 AM PST

Basically I am trying to develop a system which would allow me to measure the vertical and horizontal speeds of a table tennis ball. I am planning to interface this system with a controller that would move a hydraulic. So far my research has shown that speed can be found using triangulation in a vision system, however this way requires complicated programming. As a mechanical engineering student I am looking to solve this problem without going to far out of my area. I am wondering if any one knows of any speed sensors I could use.

Sunday, November 13, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

Revolutionary Spli Cycle Engine

Posted: 12 Nov 2011 11:16 PM PST

A Revolutionary Split-Cycle Design | Scuderi Engine

reducing the rotor noise in helicopters

Posted: 12 Nov 2011 09:50 PM PST

It is seen that the noise in helicopters is mainly due to the formation of vortices formed by the blade tips. when the vortex formed by a blade is hit by a succeeding blade, noise is produced. to eliminate this noise or to reduce this noise a lot of modifications to the design of the rotor blades have been made. but if we can remove the chance of the blade coming in contact with the vortex by offsetting the blades, i believe that the noise level can be considerably reduced. thus we will have a shaft where the blades are fixed one below. there will only be one blade per plane. the unbalance in masses can be taken care of by adding correcting masses on the other side.

Saturday, November 12, 2011

CrazyEngineers Forum - Mechanical & Civil Engineering

What kind of turbine will be efficient?

Posted: 12 Nov 2011 07:29 AM PST

While comparing impulse and reaction turbine, which one will be efficient if gas is used as input energy? and which one will be efficient if liquid is used as input energy? and why?