Material Definition and 1000 Threads

Hi everyone, Can anyone suggest a raw material that has the properties similar to steel and produce less noise when meshing with other part. I thought of polymers like Cast nylon, HDPE etc, but the issue is, it has to withstand a temp of around 200°C, during working condition. Thanks...

I have a hat, made from what I believe is rabbit hair (not leather, just the hair). I sometimes leave it in the car. I have noticed that if I leave it in the car for a long period, when it is hot, the hat shrinks. I have 2 questions. A. Why does this shrinking happen? B. Is there any way to...

i was trying to look for which forum to put this in so sorry if its in the wrong one. :D Im working on a project and i need a material that is able to reflect radio waves, like a mirror reflects light. any ideas for which material will reflect?

Homework Statement A block of material with a cross sectional area of 15cm^2 and length of 8cm is at hand. A temperature difference of 30degrees is established and maintained across the block. Find the rate of heat flow through it if the material is wood (K = 0.08Js-1m-1C-1) Homework...

Hi there, This may sound like a silly question, but I'm looking at shining a high power laser onto a target material for a fixed period of time. I have modeled Alumina in Ansys Icepak, and the temperature increase has come to 4700 degrees C. This maximum temperature is only reached for...

let me explain i do a static tensile test and get the stress strain graph. the area under the graph is the toughness that means i can use this static toughness data to predict the failure under impact loads other idea is that i have done a impact toughess test. if i can get the...

I am an electrical engineer and not familiar with this. I need to look up the permittivity and conductivity, density and acoustic speed of some common fluids: sea water, de-ionized water, castor oil, alchohol, ... Where would I find some reference containing these numbers? Thank you.

i have found the damping factor of a plate from experimental vibration. how can i find the damping coefficient of the material of the plate

I have an application where I have a shaft being supported from end to end with bearings (self aligning) and a motor hard mounted driving it. The shaft starts at 1 3/4" RD to accept motor and bearings. Then is welded to a 2" x 1/4" square tube for the output. It allows for a wooden roller to be...

What is the most corrosion resistant alloy other than Zirconium and SS that could be used in reactors but it is not economical?

Hi, I'll be starting a physics major in the fall at university. I was wondering, is there any good reading material I can get my hands on so I can start learning now? Thanks.

I'm currently doing a project in my materials class and I wanted to check if these two material indices were right. The objectives are: 1. The material must not fracture 2. The material must be strong (no deformations) Material Index 1 ------------------------ Considering a yield-before-break...

I am facing some problems regarding material selection for sour/acidic service of raw natural gas due to the presence of H2S & CO2 gas. According to the common practice if the raw gas contains <4 ppmv H2S & <6 mol% CO2 then we consider this as a sweet service and we can use carbon steel...

1- what determines the refractive index of a material? i understand that it is ratio between velocities in vacuum and medium but i want to know about complex refractive index which also accompanies extinction co-efficient. my explanation is that bent and slowing down of light depends on crystal...

i understand that the speed of light slows down in a nmaterial with a refractive index greater than one when compared to a vacuum, but is this merely the speed rather than the velocity decreasing, ie does time actually pass slower? i suppose what i would really like to understand is the...

I would like to study Galois theory by myself (I've already studied group theory). Can anyone suggest any good video lecture or pdf available on the web? thank you in advance

http://www.usatoday.com/news/washington/judicial/2010-06-21-supreme-court-anti-terror_N.htm Interestingly, this case was argued by the Solicitor General, Elena Kagan, who argued: http://www.usatoday.com/news/washington/judicial/2010-02-23-terrorism-law-appeal_N.htm?csp=obinsite The logic...

can you please suggest me good books for material science and metallurgy

Hi, I was wondering how you guys read from a book. Let me be clearer. When reading a paragraph in a book, do you read very slowly with full concentration until you understand every fact in that segment and make relevant notes, or do you read the material a few times, understand all (or...

what really makes a semiconductor? Is it just the presence of a band gap but then insulators and metals also have band gaps or carrier concentration? Or we need to perform Hall measurements and also need to study I-V characteristics? Or do we need all of these parameters to establish a material...

I am attempting to determine how strong a magnetic field will be on the other side of a thick material and then across an air gap. For instance, I have a closed steel cylinder with a steel piston inside it. I plan to affix a permanent magnet to one side of the piston (inside the cylinder)...

Hi guys, If you look at the picture I have included, where a bolt is forced in compression against the plate it is holding, to which example from Roark's would this condition be? (i.e. annular plate with a uniform annular line load, outer edge free; inner edge guided... etc?) I am trying...

Hi, I'm struggling to find a constructive proof (through natural deduction) of the material implication replacement rule (i.e., that (a => b) <=> (~a \/ b). I believe the only possible way would be through contradiction, but I can't seem to get to it. Is it even possible? Thx.

Dear Engineers I am very curious to know about Piping material specifications (PMs) . How can I select the appropriate material for components which is used in piping? For example we use A106 Gr B for vapour pipes or A105 for flanges and A105/A234 for fittings less/bigger than 2". Now I want...

So I am taking intro to stats and probability and I am having trouble understanding something that may be quite difficult to explain in counting. Let me start by telling you what i understand The choose function i.e (6 C 2) will take six elements and create a SET of 15 TUPLE's, in which...

A fluid moves so that its velocity is \vec {u} \equiv (2xt,-yt,-zt) , written in rectangular Cartesian coordinates. Show that the surface F(x,y,z,t) = x^2exp (-2t^2)+(y^2+2z^2)exp(t^2)=constant moves with the fluid (so that it always contains the same fluid particles; that is, DF/Dt=0)...

Dear Engineers I am very curious to know about Piping material specifications (PMs) . How can I select the appropriate material for components which is used in piping? For example we use A106 Gr B for vapour pipes or A105 for flanges and A105/A234 for fittings less/bigger than 2". Now I want...

Plastics is one of the widely used material in the modern world. Almost all the items that we use today are made up of plastics. It is also a major contributor to environmental pollution. Which is the best material that can replace plastics? Ethan

I'm looking for a solid material that will diffuse light throughout it. In particular I would need a thin bar with a light source at one end that will diffuse light to all sides of the bar, however, I don't specifically need a bar as long as the material can be machined. I'm trying to search...

Hi everyone. This isn't a homework question; just something I was thinking about and would like some advice on how I should tackle it. Homework Statement How can I approximate the Kinetic Energy Lost of a Steel Sphere when it collides with a soft sheet of material. A solid steel sphere of...

Can someone please explain the difference between Material dispersion and waveguide dispersion?

Hey all, I need a little advice. Are we suppose to derive equations in order to lead to understanding of the material? What is the point of deriving equations? Should I instead read the material first and see how it applies to the problems? I don't do any of this and maybe that's why i have...

hi, i have decided that i want to do research into ; quantum computer (if quantum computer are invented by the time i graduate ) then nanocomputer/nanorobotics more specifically their application in oncology and drug delivery renewable sources of energy ( if possible ) open a...

Hi everybody, I'm focusing on meta-materials. I have recently read Schurig's paper "http://www.opticsinfobase.org/oe/abstract.cfm?URI=OPEX-14-21-9794"). In the article, the components of the permittivity tensor are given by \varepsilon^{i'j'} = \left|\rm{det}(\Lambda^{i'}_{i})\right|^{-1}...

I have built a loading machine for testing material properties. It applies tension at slow rates (ie 1htz) under load control until the specimen fails. One thing I noticed is that if I tap the material as it is loaded, it seems to give off a different pitch noise when it is under higher tension...

i am really wondering does Material engineering has a future. I am wondering this as my friends made a few comments on this subject and i am currently very confuse 1. People who study Material Engineering will most likely very difficult to get a job or the job will be related to radioactive...

Hello everybody, This is just a general question I have, and probably the title did a very bad job at explaining it, so here it goes. Is there any material that is available, or even if its still in research (as long as you have some links), that bends/flexes or contracts in certain...

In class we have been deriving the Fraunhofer interference pattern for a double slit experiment. I now have a question of having to derive it if one of the slits is covered with an absorbing material. I have got the equation out but I am missing a constant K... Homework Statement We have two...

When a dielectric material insert between two plate capacitors the conductivity may increase. Normally we talk that a dielectric is insulator?but how can it increases conductivity?

Homework Statement The refractive index of a material is different for different wavelengths and colours of light. For most materials in the visible range of the electromagnetic spectrum, shorter wavelengths have larger refractive index compared to longer wavelengths. The effect of...

why failure stress depend upon material instead of size and shape?

Can anyone explain the concepts behind dielectric material inside a capacitor. Why is the capacitor able to store more charge exactly? Thanks!

Homework Statement i am trying to work out the required material thickness for a given box. the material i am using is aluminium. i only require the formula - can't find a suitable one on web Homework Equations The Attempt at a Solution M = I σ y M = bd M...

Looking for a flexible plastic, equivalent to TPE shore A 50-60. Finish to be similar to ABS or PC, which mean high gloss, polish finish; that can be injection molded. Can somebody recommend a plastic resin that meet those criteria? -robert

In my project i have solar cells we use are called B50 cells with an efficiency of 21%. Since the cells come in contact with water we are looking for a cover material that is first of all watertight and secondly it should influence the performance as less as possible. Last but not least the...

Hello everyone, I have some difficulties to solve this question in my homework. Homework Statement Picture http://img714.imageshack.us/img714/7953/picz.png Rigid bar ACE connected to rod AB, CD, EF which have same material and surface area A. Calculate tension caused by force P in...

I am currently looking for a particular material that becomes strained under electrostatic or magnetic fields. I am new to the world of solid state physics and I was interested on doing a research project on the studies of the electrostriction effect. Thank You

Homework Statement May i know how to know boom and rod, which is in tension and compression? http://img7.imageshack.us/img7/5728/16203309.gif http://img7.imageshack.us/img7/2595/57134603.gif Homework Equations The Attempt at a Solution

The english version of this book has almost 50 pages more than the french one. Added material or just different type set?

If we consider a material with uniform magnetization \vec M, what are the \vec B and \vec H fields everywhere in the magnetic material? My first inclination is to say that \vec H = 0 since there are no free currents and that therefore \vec B = \mu_0 \vec M everywhere, but I can think of...