Materials Definition and 919 Threads

Future prospects in "Metallurgical Engineering and Materials Sciences" I hail from India, and thus have given IIT-JEE. Based on its ranking, I might get enrolled for the 4 Year course "Metallurgical Engineering and Materials Science" in one of the institutes. Now what I want to know what will...

Good day I am trying to find a list with various paramagnetic materials and their Curie transition temperatures. That is, the temperature for the phase transition from paramagnetic to ferromagnetic, in cooling the paramagnetic material. I am looking for a easily obtainable paramagnetic...

Hello. I am studying material physics. I heard in the class that every adhesion or bonding can occur only with frictional force. Today, I tried to find a proper reference for this statement but I could not. Is there any reference that every adhesion or bonding(esp. Injective...

Homework Statement Here is a link to a picture of the problem: http://imgur.com/5nOnpJE Click on the picture to make it bigger, and readable!I need to find the angle that the two rods will have the same stress. We are talking about normal stress here! Homework Equations \sigma = Force /...

Greetings. I want to experiment with the effects of macroscopic ionized solids. But first, let's have a little 'thought experiment'! If I have say, a gram of elemental copper, surrounded by ultra-pure water and it's put into a device which is capable of filling all of the valence...

Hello! I'm currently in the summer before my freshman year at a University and I was wondering what books would be "good" to read. I'm a physics major but I'm also interested in math. Let me expand, by "good" I mean some book (textbook, etc) that would expand my knowledge of physics beyond...

I'm currently a chemical engineering student and I have a huge interest in materials science, probably more so hard materials than soft materials (which is why I feel chemical engineering is a bad choice). Can I get into the field of materials science via a chemical engineering degree...

I am working on a concentrated solar heater using a linear fresnel reflector. I want to learn how I can harness this heat to power a cooling system, preferably with minimal use of electricity. I am in India, so this has a huge ground for application. I was looking at ideas here, and while...

Why is is that certain materials -- like plastic, metal (assuming it doesn't rust), glass -- retain their shape when they get wet, and some materials -- like paper -- don't return to their original shape even after they become dry again? My knowledge of chemistry is pretty limited, but my...

I don't know the reason of materials' color? Why one matter is blue and another is red? Which mechanism is responsible for their color; Absorption, Luminescence, Scattering, Reflection?

I am currently reading some of that material but started to wonder because some of it seem basic enough to me though I don't have a real concrete background yet. I was wondering if it is A-level equivalent because it couldn't be college physics. Oh yea and err can't I post on other sections...

Any advice on a chem major/math minor going into materials science grad degree? Most helpful curriculums? How deep should you take physics/math in undergrad? Job Outlooks/what kind of work expected? Is it really a safe jump for a chem major? Will it be easy to push away from chem and more...

Homework Statement Compute the crtitical surface edge crack if the fatigue life = 8000000 cycles and maximum tensile stress is 21000 psi. m=3.5 and A= 0.00000000004 in ksi and in. units. Initial crack edge is 0.120 in. Y= 1.15 Homework Equations The equation is given in the attached file...

Hi, I wanted to make a powerpoint-like presentation for myself, simply for self study. I figured I'd experiment with some of the animation features to see whether it would have a positive impact on my rate of study. However, I don't have Microsoft office (thus powerpoint) on my current...

Hey guys! I'm doing a science project on high temperature superconductors and i was just wondering, what kind of metals that can be bought will become a superconductor when put in liquid nitrogen. Liquid nitrogen of course is 63k so anything below 63 kelvins will not work, however if a metal...

Hello everyone, I am a student in Engineering Physics and I'm currently at the point where we have to choose in which domain we want to specialize. The undergraduate program in Engineering Physics at my university is leaning much more towards the physics part than the engineering part, so we...

it's known that for the visible part of EM wave(electromagnetic wave) , black materials absorb more visible light than white materials do . a friend of mine asked me if in general , black materials absorb more EM radiation(whose frequencies do not lie within the visible range) than white...

Hi, I am in the middle of revising for and a classical electromagnetism exam, and I've hit a wall when it comes to tensor equations. I know that for anisotropic materials: J=σE and E=ρJ And that in component form the first equation can be written as J_i = σ_{ij} E_j What I'm wondering...

Hey guys, I'm new here so please be easy on me if I break any "unwritten" rules. I'm doing a design study on brittle crack growth in ductile materials. As I understand it, when a macroscopic crack is found in a load bearing plate, holes can be drilled at each end to reduce the internal...

A tie rod of max strength and minimum mass performance index Max strength - τ= 2T/πr³ Min mass- P=t^(2/3)/p I have been asked to explain how the performance index is affected by (i) safety factor (ii) changing the objective to minimum cost Any help would be greatly appreciated...

The answer I'm hoping to achieve from this discussion is how high a field applied to air has to be in order for it's magnetic flux to match the magnetic flux of a ferrous material. As you may know, ferrous materials are used as magnetic cores, but once the applied field reaches a certain...

A mild steel solid shaft is to be replaced by a stainless steel hollow shaft of the same outside diameter. Calculate the ratio of internal diameter to external diameter of the hollow shaft for equal strength. Also find the percentage saving in weight if density of mild steel is the same as...

So I am in the IB, and I have to do an extended essay. I'm doing it in physics, and I'm looking at the topic "What materials offer the best shielding against an electromagnetic pulse (EMP)?" I was thinking of measuring the electromagnetic pulse using an oscilloscope. The reason I want to...

I have a question I really would be thankful if I had some help For the mix design in the fresh concrete.. I've got the compressive strength 6525 psi, I didn't find it in any table to find the w/c (water-cement ratio), what should I do and if there is a formula for it what it is?

Is there a "Stuff -> Materials it's made of" reference around? This is somewhat a borderline question, but I guess the Materials subsection of the forum is the best place for it. Yesterday I broached a bottle of wine, one with bubbles (that's the most elaborate description my wine expertise...

Hello.I recently discovered the Lagrangian approach on classical mechanics ptovlems, such as a spring pendullum, or even on particle physics problems, and i think it s a really smart way of getting results. I'd like to approach this method deeper and so my questions are the following: 1.What...

I was looking up info on this topic and came up with this article (http://eng.sut.ac.th/metal/images/stories/pdf/Lab_7Bend_Eng.pdf)... what I don't get is why it says that bending test for ductile materials isn't good. "The stress is essentially zero at the neutral axis N-N. Stresses in...

Hello, I'm working on a design for an architectural structure, and I am choosing the material for the design. Are there any resources that will tell me the breaking point for like "1-inch" of material X. I need something that can support the weight of a car. Thanks! Carpetfizz

We all remember the experiment where two wheels, one made of metal that is hollow and one of solid wood, of equal mass, circumference, and width are raced down a ramp, how the wooden wheel accelerates faster. If you cut the wheels in half and used one part of each to create another wheel, half...

When I have a metal object at 0 degrees and a plastic object at 0 degrees, the metal feels colder as heat is conducted away at a faster rate. The reason for that would be that the metal is a better conductor of heat so when my hand touches it, it can start vibrating more quickly than the...

Hi and thank you in advance. I want to understand how do fractures/breaks/fatigues occur in general. I remember a proverb saying that when a farmer breaks a rock after 100 hits using his axe, it is not the 100th hit that breaks the rock, but it is all of the 100 hits. How material...

What would happen to things on Earth if transported to the moon? For instance, say that a house, with furniture and fixtures in place, were dropped gently onto the moon's surface? How about food - meat, vegetables, fruit? Would things crack? Or would they survive the experience so that if...

Which field of science is at the forefront in the design of novel materials (biomaterials, semiconductors, energetic materials, etc.) and nanotechnology? I would imagine that physicists and materials scientists work together to achieve the above goals, but can someone describe to me the role...

Greetings! I just finished my bachelor's degree in physics. I am now applying for a master's degree in physics. My bachelor's thesis was an experimental study about aerosol. I am planning to shift to theoretical physics. However, I want my topic to be related to materials science...

Consider a cantilever beam of rectangular cross section made up of two materials steel and aluminium. an axial force is applied at one end. the question asked was which material should make up the upper part and which should make up the lower part of the beam? Could someone please help me in...

I was reading about the development of new nanocrystal materials which could allow heat to be manipulated in the same way we now do with light: http://web.mit.edu/newsoffice/2013/how-to-treat-heat-like-light-0111.html What shall we call this approach? Thermoptics? I'm not sure from...

Hi everybody! I am working in a solid state physics group and need to find some heat transfer data to finish my calculations. I need to find the Nusselt number Nu=\frac{hL}{K} describing the heat transfer interface between a Si wafer and helium gas at a variety of temperatures. To find this I...

Hello, why if a ray pass though different materials its direction changes ? couldn't its propagation speed just increase or decrease without having to change the angle ? Thank you

[FONT="Book Antiqua"]Is there any material which could change from liquid state to solid state after appiled some force? :smile:

Can anyone recommend any REUs or other summer research programs in materials science and/or physics? I'm interested in your overall impression of the program, but pros/cons could also be helpful.

Recently I've came by this article: "Intercontinental quantum liaisons between entangled electrons in ion traps of thermoluminescent crystals" by Robert Desbrandes and Daniel Van Gent http://arxiv.org/abs/quant-ph/0611109 Researchers used ion traps caused by imperfections of the crystals to...

I am having a bit of trouble finding data about the various combustion temperatures (pyrolysis, smouldering, and flaming) temperatures of everyday materials. Here is the data I have collected so far (forgive me if anything is wrong): *Wood/Paper (C6H10O5)x: Pyrolysis Temperature is 233°C...

In my physics class, we learned that light moves slower when traveling in different materials like water or air. However, it is the fastest in a vacuum. I was wondering why this happens. I read something about a refraction index in the different materials. For example, water has a refraction...

There are materials which block laser beams (or light globally) or weaken its intensity via shading i.e. a beam must have crossed a specific energy barrier in order to pass this shading where beams with less energy will fade and won't pass. The question is, is there a material or a type of...

Hello everybody, We need your advice with a project for building a simple one-beam bridge. We have figured out the dimensions, required load, max allowable stress and safety factor. We need to choose a material that would support our requirements. Which formula should we use to compare...

Why when you compress materials like concrete do they fail in shear? Can the thing you're compressing be too small to fail in this way?

I am an undergraduate student in nuclear engineering, and I want to pursue a PhD in nuclear materials. I have research background in materials corrosion, but my undergraduate university doesn't have courses on materials science for nuclear engineering students. I have noticed that many...

I am taking the Math Subject GRE on Saturday and finding study materials has been nothing short of a major pain. Maybe we should compile all of the study materials we have found into one central location here. I'll start: http://www.math.ucla.edu/~cmarshak/GREWorkshop.html Feel free to...

Hi I am having toruble differentiating between the two. below the curie temperature BaTiO3 behaves as a ferroelectric, the Ti ions are offset from the centre, causing a polar domain. But it has a net polarisation is zero. Now above the curie temperature all the dipole cancel each other out...

Does anyone here know any good Bayesian statistics, Bayesian hypothesis testing, Bayesian inference, etc. learning materials (preferably online)?