Materials Definition and 989 Threads

I’m currently working a project to produce a roadside speed camera which displays vehicle speed to drivers to improve speed awareness. A Doppler radar gun operating at 24.1GHz (1.24cm) is being used as the source and detector. There is a weather tight plastic box (opaque, at least to visible...

Hi Does anybody know how to find out the potential energy of two equally heavy, equally big and equally charged particles that are placed at the boundary layer of two different media(for example such that mercury is at the bottom and oil is on the top of both spheres( if you know the answer...

1.The center rod CD of the assembly shown in the figure is heated from T1 = 30oC to T2 = 180oC using electrical resistance heating. The two end rods AB and EF are heated from T1 = 30oC to T2 = 50oC. At the lower temperature T1, the gap between C and the rigid bar is 0.7 mm. Rods AB and EF are...

Dear all members, I just need anyone of you to verify my system and some equations I have worked out for my problem below. Please feel free to point out any flaws in my reasoning and formula applications. Problem Definition: Two flat blocks (different materials, Fiberglass and Rubber)...

Dear all members, I just need anyone of you to verify my system and some equations I have worked out for my problem below. Please feel free to point out any flaws in my reasoning and formula applications. Problem Definition: Two flat blocks (different materials, Fiberglass and Rubber) rubbing...

Hi all, I am interested in pursuing a degree in materials engineering in order to become a materials scientist/engineer. However, I am a bit confused with the wording of some of the degrees various colleges are offering. Is there a difference between a degree in Materials Engineering and a...

I am a rising junior physics major and math minor at a small liberal arts school. I'm interested in possibly pursuing materials science for grad school (hoping to complete a PhD). However, I haven't yet taken intro-level chemistry. Originally I was planning to complete the intro sequence...

What is mean by advanced materials science and engineering

So water is completely transparent, it doesn't look darker in a glass so why when you tip it on cloth for example the cloth looks darker?

Why is it that the magnetic component of light interacts more with metamaterials than with naturally occurring materials? It would be nice to explain this in terms of inductance, permeability, and permittivity within SRR metamaterials. I'm currently an undergraduate participating in...

Electric double layer capacitor is charge storage device which using the mechanism of forming electric double layer on the interface between electrolyte and electrode. What is the requirement for active materials that used for electrode, is it require high conductivity and good chemical...

Hi guys, I'm really interested in finding out information about materials that solidify from a semi-solid state (like tofu or silicon-like) to hard solids under magnetic field or stress. I don't know if there's a name for it but I would really appreciate if someone could hook me up with names...

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 Hi, Please help me to identify the materials required for a large travel suitcase and the properties which are required for it too. Homework Equations The Attempt at a Solution I was thinking of nylon as one of the materials for a travel suitcase. Properties...

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...

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 My question is, does...

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?

Materials Science vs. Physics for Grad School Hello, I'm a new poster here, but have gotten a lot of great stuff out of this forum in the past... Some questions/thoughts on a Mechanical Engineer pursuing a graduate degree in Materials Science (or Physics...) I'm interested in optics...

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...

Homework Statement Based on the data in Table 1.3 of Hertzberg, estimate the elastic modulus of an iron single crystal along the [2 1 -3] direction. Express your answer in GPa in the form yyy.y S11=0.80, S12=-0.28, S44=0.86 (10^-11Pa^-1) Homework Equations...

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...