Materials Definition and 919 Threads

So i was on my school's website and i noticed that the general education requirements for chemE and materials science is EXACTLY the same. I also think i can be finished with all of the general ed requirements at the end of this year, since i got a head start with AP classes last year. If i...

Are there certain materials that reflect acoustic waves diffusely? Would the material need to have large (visible) surface features to produce this kind of reflection or can the surface be smooth? Are there materials that reflect acoustic waves in accordance with Lambert's cosine law?

People tell me that a straight column wood is stronger than applying weight on a slanted angled wood. It seems like common sense that there's more force applied on an angled wood but when I try to prove it I can't seem to prove it with math.. Please help me.

Heres a question I am stuck with Crosslinked polymers consisting of 62 wt% ethylene and 38 wt% propylene may have elastic properties similar those for natural rubber. For a copolymer of this composition, determine the fraction of the ethylene mer. Express your answer with three decimal...

Yidun Wan gave a very nice talk a week or so ago at Perimeter. It is on video http://streamer.perimeterinstitute.ca/mediasite/viewer/NoPopupRedirector.aspx?peid=7a27faa9-6d55-41fb-9fba-6901167c2bb5&shouldResize=False This is part of a research effort by a handful of people aimed at getting...

Both titanium and aluminum alloys are used extensive in aircraft and aerospace systems. There is a thread on aluminum and its alloys, so I thought it would be worthwhile to have one on titanium and its alloys. WahChang is a big titanium alloy producer, and they periodically publish articles...

Pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee I have to present a paper on Aircraft materials and I have only one month left to prepare... I've split my paper into 3 parts and for the third aspect,I need to know the material details of Jumbo Jets like 787...

Can anyone provide me with insights on limits? Like L' Hospital rule (don't know whether spelt right), and product rule such as lim_{x\rightarrow\a} [f(x)g(x)] = lim_{x\rightarrow\a} f(x) \cdot lim_{x\rightarrow\a} g(x) should lim_{x\rightarrow\a} f(x) and lim_{x\rightarrow\a} g(x)...

:rolleyes:I am designing temperature varying tube for VSM, especially high temperature. I don't have any experience on materials for this component. Please give me your idea about choosing material. Requirements for the tube is :shy:: - easy for machining - to use for medium vacuum (10^-4...

http://sciencehack.com/pages/about This looks promising.

Need Materials for "Stability and Control Helicopter" Hi everyboy ! I'm now very disappointed, it's beause I have googled the materials of "stability and control helicopter" and what I got is nothing but disapointment. So, I need your help for the materials. Is there anyone got them ? please...

Hello, can anyone kindly tell me about the use of composite in biomedical field? And what are those composite product, and the materials name? your help is greatly appreciated, thanks a lot ^ ^

Homework Statement In the attachment Homework Equations The Attempt at a Solution I have been solving this question for quite some time but I can't get the answer yet. I offset all the forces to point C and I get the following values: Moment at y-axis, M(y) = 10Nm Moment at...

Hey, an article on the new Discover Mag talks about underground labs trying to detect dark matter. It mentions that the sensors have to be brought down to almost near absolute zero... I then realized that, even though I keep reading about things being put in extremely low temperatures, I have no...

I was wondering whether it is possible to use photochromatic switching effects, for photonic structures on silicon. The problem might be that silicon is not transparent for the same wavelengths as photochromic materials. So basically, I was wondering if somebody knew about applications...

Homework Statement I want to know what happens to particles inside a material, when they are pulled or fixed. That's all I've been asked to do.Homework Equations There are none. The Attempt at a Solution I've been searching through google and ask.co.uk but everything I click on doesn't talk...

I'm in the process of fleshing out some ideas for a story and one part of the story centers around a golf ball sized hemispherical hopping toy. I want the toy to be magical in the sense that it is made from a material that is physically impossible in our universe. Whatever this material is I...

I am looking for extreme light weight electrically non conductive materials which also has some thermal resistance as well. I am building a High voltage generator of 250,000+ volts at 50ma I am needing to shield the applicational machinery and computers where I have very low weight bearing...

if anyone could provide any insight as to how i go about completing this question i would be grateful, i was off the week this was taught to the group and have no idea whatsoever

This is a very nice summary of Materials and their Properties and Characteristics http://www.ndt-ed.org/EducationResources/CommunityCollege/Materials/cc_mat_index.htm

Hello, Hey I was just wondering, is there any grand database of all papers published in the materials science industry. I have found some effects which seem unique to my current knowledge of the literature (the some 100 or so relevant papers I have looked at). Do I just have to google into...

Homework Statement problem 2.12-5 http://www.geocities.com/greenlran/mechmat.jpg Homework Equations Vy(max)=integral Tau(xy) da The Attempt at a Solution I'm having trouble setting up the integral (determining what to use for da). I tried integrating with 32in^2 as da giving me...

Hi, I'm doing this investigation for school, and i came up with the idea of comparing the effectivenss of different matrials at absorbing impact. I have an idea about using a pendulum, where i release a bob of known mass at known starting height then let it hit the material. Thus, afterwards...

Can anyone help me understand the concept of a "strain invariant" given a strain state matrix? or perhaps point me towards something? thanks for any help.

Is there any material that can block magnetic energy?

I studied mechanical engineering at UCSD for my sophomore and junior years after transferring in from being a math major at Pomona College (east of LA). One thing I remember is that we talked about the material composition of steel. It has a crystal lattice such that the carbon atoms fill in...

Can someone recommend a book to use in lieu of "Engineering Materials and Their Applications" Flinn 4e? Table of contents: http://www.wiley.com/WileyCDA/WileyTitle/productCd-0471125083,descCd-tableOfContents.html"

What makes some pure metals more ductile than other pure metals? I know ductility is defined as the ability of a material to be drawn into a wire, and one measurement of it is the percentage elongation from a tensile stress test. But does anyone know what is going on at an atomic level when the...

I know that in vacuum light travels with the speed c. But in different materials(eg water) the spedd is lower than c. I wanted to know what's happening that the speed decreases, and didn't came to a conclusion. given the energy of the photon ε=hf=√(m_0²c⁴ + p²c²)=pc=M·v·c since the rest mass...

Hi, I was just wondering if anyone knew if there was a table that listed the maximum charge density different materials can accomidate... Thanks in advanced, - WiredGuy

can anybody tell me whether nanotechnology is related to materials technology or not?

Hi, since I don't have exact knowledge about materials and particle coupling, I want to ask for result of simple experiment: imagine you have very tough stick 10 meters long. Let's say the stick is fitted on firm steel table in sliding blocks. Table is equipped with actuator strong enough...

can anyone explain the precess on how to make kevlar, or ceramic plate armor even vectran , the knife resistant material would be helpful.

hey, i'm doing a course on materials science as part of an aerospace engineering degree. I'm just trying to gain a full understanding of some of the fundamental concepts involved. Would i be right in saying that, all processes that occur in metallurgy on an atomic scale (like...

Hi, i am new to this forum and have just moved onto the second year of my BEng mechanical degree programme.We have been given the task of reverse engineering a 1.4l ford zetec s engine from a 1995/1997 fiesta. The problem we are having is identifying the materials used and the manufacturing...

We know that the permittivities of ferroelectric materials are dependent of temperature because of phase transitions. I want to kown if this is also true in non-ferroelectric materials? If it is true what is the mechanism of it?

I've to choose one, material science is one of my favourite subjects, but i ignorethe nature of those 2 subjects in general and the profs aren't willing to say anything usefull...I'm confused because people wouldn't take more materials, as it's being said that it's difficult and very...

Hi all, I was looking into magnetic shielding materials. I have the impression that nickle, copper, steel standalone are good shileding materials. However, some people claim that an alloy of these elements (eg. netics) are better shielding materials. Is this simply an empirical measurement...

Hi all, I was looking into magnetic shielding materials. I have the impression that nickle, copper, steel standalone are good shileding materials. However, some people claim that an alloy of these elements (eg. netics) are better shielding materials. Is this simply an empirical...

Hello. I am currently working on a project to build a prototype concerning the topic of energy. My group has brought up the idea of developing a floor system made of piezoelectric materials with sensors to generate electricity for houses. I have been searching earnestly to find information...

I am new to the forums, so hi. I have been woundering about meta materials. From what I know, meta-materials are extremely small objects that are able to bend light because of their unique shapes. Some have demonstrated how they can be placed to cause an invisibility cloak by having the light...

concept problem There is a material and it is pulled by a distance by applying a force F. Tell me whether my intuitions is correct 1.In the world around we see materials of different shapes because the inter molecular forces bonds the molecules together in such shapes. 2.If one likes to...

If I were to take a permanent magnet and hold a piece of, say iron, a fixed distance away there would be constant attractive force generated between the two bodies. If I were then to cool the magnet down towards absolute zero, but keep the temperature of the iron constant, what changes would I...

Need Solutions Manual for "Mechanics of Materials" I am trying to locate someone that has a solutions manual for "Mechanics of Materials" Edition 4 by Beer, Johnston and Dewolf...copyright about 2005. If anyone has one or happens to know where to get one or where to look I would be...

I need a huge table of the dielectric consant and breakdown of various materials... I have looked all over the net but can only find small tables with 5-10 materials...

What materials for positive pole, negative pole and what acid when put together create a perfect battery? (I'm not talking about everyday purpose for a batery (so never-mind how bio-hazardous a material is), but a theoretical (greatest voltage, greatest current possible, yet stable enough (so...

virtually indestructible materials, say "adamantium." I want to know if this would be possible. Imagine a bicycle wheel, with the spokes and all, in your mind. Now, visualize the center of the wheel, where all the spokes more or less meet. Rotate it in your mind say at the center about 5...

Im including a scan of the problem and my work, please let me know if I did this right. Sorry about the sloppy handwriting. http://img244.imageshack.us/img244/6521/strengthsproblem3rk.th.jpg http://img241.imageshack.us/img241/8866/strengthsworkedout1rw.th.jpg

Hi This looks like an easy question but I'm stumped and would appreciate some help. A rod is made of two sections joined end to end. The sections are identical, except that one is steel and the other is brass. While one end is held fixed, the other is pulled to result in a change in...

hi all, Please can you help list materials that can be used to Block, Reduce, Stabilize, Increase or react with the fields from perminant magnets il start with Graphite: A Magnetic Stabilizer Coper: A Magnetic Inductor