Material Definition and 1000 Threads

Hi I'm having an issue ANSOFT MAXWELL : Assigning a permanent magnetic material to a body (for ex NDFE35) provides me a means of setting the magnetization direction (through x,y,z unit vectors ) inside the material settings so if i have multiple PM bodies rotated :- 1- do i need to create a...

Hello all, I had clarified that refractive index of material such as(aluminium, copper, lead, teflon)changes with the temperature. the refractive index change even for this temperature range: -196 to 25°C ? I need to know like any law which gives a direct relationship between 1)the density and...

Hello guys, actually I'am working on a model to describe the creep-behaviour of a concrete specimen. This model is based on a 'generalized maxwell-chain'. I attached a picture, where you can see it: The acting load is the tension \sigma, while E_0 and E_1 are the stiffnesses of the...

I'm not sure if this would be the correct place to ask this, but I am planning on creating something that could very well increase some physical attributes of the human body. to do so I have to succeed in what I believe is the most complicated step in my experiment. so I need to know, is it...

What material has the lowest melting point? I'm doing an interesting research project of finding an invisible ink. My purpose is to find a material on which I can write on and has a very low melting point. I want to write on this kind of material by using my invisible ink. From my research...

http://physics.stackexchange.com/questions/156708/can-the-relative-permittivity-of-a-semiconductor-material-be-lower-than-1 To measure the relative permittivity of a p-type semiconductor material (a metal phthalocyanine ) , a M-S-M structure was made by thermal evaporation method. The...

1. Problem statement A steel rod supporting a stress of 8000 psi at 1000 ◦ F is not to exceed 5 % creep strain. Knowing that the steady-state creep rate can be expressed by an equation of the form ##\dot{\epsilon}_{s}^{C}=B|\sigma |^{n} exp \left(\frac{-Q}{kT} \right)## ε⋅, strain rate B...

I’m searching for an introduction to relativistic Boltzmann equation. (Sorry, I know this is a question about learning material) I’ve read an excellent script from David Tong about non-relativistic kinetic theory (from Liouville to Navier-Stokes using Boltzmann equation (see link below)...

I looked somewhat extensively through the threads to see if this question has been asked before, so if it has, I offer my sincerest apologies. I'm a second year community college student and only recently decided for certain that I will be majoring in a mathematical subject (Physics or Econ)...

There are conductors with loosely bound electrons such as Cu, what is a conductor that contains loosely bound "holes"?

Hi all, I have a general question about material properties. We know that the material property value depends on the input level. For example, the permittivity in a dielectric material changes depending on the applied electric field. That being said, when we apply an alternating electric...

I'm attempting to figure out the torque required for a twist drill bit to shear through a material. I have no idea if this is even remotely correct but this is the process I used. Ultimate shear strength = Force/Area Therefore Force = USS x Area The USS of the material = 360 N/mm^2 I...

Hi guys, Would like to know what's the highest compressive strength ever measured in any material, and what material that might be. Specifically wondering if there are any materials with gigapascal-level compressive strengths. Thanks! Rgds, Wally

I'm trying to make a blimp robot, I want to get into the drone-building hobby but right now a quadrotor is too expensive, plus I want to be a bit more original. I need something that I can make the balloon out of that won't leak (so I don't have to refill it often) and reasonably durable...

What's a suitable Material of construction for equipment handling hot brine (NaCl) solutions? Temperature is max approx. 100 C. I'm conflicted if or not SS316 works? I looked up an old handbook and it reported a corrosion rate of 0.2 mm/year (@80 C) which seems not too bad to me. But I've...

Homework Statement A very large slab of material of thickness d lies perpendicularly to a uniform magnetic field \vec H_0 = \vec a_zH_0, where \vec a_z is the unit vector in the z-direction. Determine the magnetic field intensity (ignoring edge effect) in the slab: a) if the slab material...

Homework Statement A coating of n1 = 1.33 material is to be added to n2 = 1.50 glass, in order to make it "irridescent." a) What is the thinnest layer of material which will have a reflection maximum for normal-incidence light at BOTH 400 and 600 nm (vacuum) wavelength? b) This thickness will...

I am working on a project, however I am having trouble finding the right material for it to work. I am looking for a nano-material or any molecule that will emit a radio frequency when subjected to a voltage or a current at around 37 degrees Celsius. I would really appreciate it if someone could...

I need some informative books for a beginner. However, I find most beginner textbooks too simple, vague and incomprehensive. I find it annoying that many texts are extremely vocabulary based, and fail to inform the reader of HOW particular physics mechanisms work. Instead, these texts vaguely...

Dear all, I'm a university student in charge of developing a biochemical device (reactor) for the depuration of leather factory wastewaters, this is an european project leaded by Ambiental Engineering University of Florence. Part of this device should be colonized with fungi in order to purify...

I put helium in a balloon (with a maximum pressure of 1.5-1.7 atm), but I do not want changes in the volume, so I have to use a rigid material (non-elastic). To make sure that there is only helium in the balloon, I have to create a "strong vacuum." My fear 'that, in the material can break or...

Lay person here... If there was a new metal that was discovered with extremely high electrical conductivity and corrosion resistance but no thermal conductivity, what do you image its industrial uses might be?

Hi to all of you, As the Biot-Savart-Law is based on experimentations in air, i like to know how to calculate the magnetic flux density in material with much greater permeability, where the circular like shape of the field distribution troughout the vicinity does not apply. Does anyone has a...

Would it be possible to use a 3D printer to print plastic (PLA for example) that could be smashed or warped by sound under 110dBs? I'm a biologist, trying to recreate what happens to hair cells in the inner ear when you damage them. Thanks.

Hi all, I'm looking for physical and mathematical explanations for a phenomenon I've noticed when working with rotated material properties relative to an XYZ coordinate system. For certain rotations (~40 to ~50 degrees) about a single axis the S12, S13, or S23 components of the compliance...

Homework Statement Using Darcy’s law, plus another appropriate relationship, derive a single equation for the pressure distribution in a porous material. Your equation should be stated in terms of generic operators (i.e. without assuming any specific coordinate system) and allow for the fact...

Homework Statement The cross section of a 20 cm thick, 3 m wide, and 1 m high composite wall is shown. The conductivities of materials A, B and C are 1.0, 0.1, and 0.05 W m-1 K-1, respectively. One side is exposed to air at 295 K with a heat transfer coefficient of 4 W m-2 K-1, and the other...

Homework Statement A body is moving, with the following data (these are all dependencies of the radius vector components respective to time): x(t)=At2, A>0; y(t)=Bt, B>0, z(t)=0. How does the trajectory of this movement look? Homework Equations r=x(t)i+y(t)j+z(t)k Velocity=dr/dt The Attempt at...

I have an issue with this question: An aqueous solution containing 15% NaOH and 0.5% NaCl is concentrated at a rate of 100 kg/min in an evaporator. The concentrated solution is then mixed with 2000 kg of aqueous NaOH solution in a mixer. At the end of one hour a sample is collected from the...

Hello, I'm trying to create the coldest freezer pack that is still soft and pliable. (Or will at least soften up within 10 minutes). It should also ideally stay cold for as long as possible. I've experimented with a few options so far and Water + Glycerin seems pretty good. If you add just a...

Hi, Sorry for double posting but I wasn't sure of the right thread. I am working with a colloidal system in which the particles are heavier than liquid. However when I add styrofoam to the system, the particles float. I can't seem to understand why the heavier particles float instead of...

Homework Statement Given that a rock is 60% porous, and if it's subjected to a large pressure that closes the pore spaces of the rock, what is the dilatation Homework Equations dilatation = ΔV/Vo= εxx + εyy + εzz The Attempt at a Solution Is this problem as easy as it states? If...

This is what we have in text-books and in Wikipedia: ρ=ρb+ρf and from there we get ∇.D=ρf. But I am unable to understand why we are not considering the bound surface charge in deriving this equation. Can anyone explain this to me.

When looking at the cage or structure used to carry materials into an oven for the annealing process, what material properties are most important? Lets saying during full annealing of aluminum, the oven is heated to 540 degrees Celsius. A cage is used to carry the aluminum into the oven...

A problem involving E, D & P. I have the answer but not sure why for the P bit.A bit of clarification if someone could, please. A thick sheet of polystyrene, of relative permittivity ε = 2.5, is placed normal to a uniform electric field of magnitude 500Vm−1 in air. Find the magnitudes of...

Hi, I wonder if there is a material or paint/dye that would change color when exposed to air? Ideally, it should have the following properties: White-to-black, black-to-white, or any other high contrast color transition (e.g, yellow-to-brown would work too) Works under normal conditions...

I'm looking to create a very small expandable package to be filled with a very small amount of a volatile material at a low temperature. I'm looking to fill this package somewhere around 0.2mL of this material (propane, butane, etc) so that when exposed to room temperature, the package expands...

I beg forgiveness if this should be in chemistry; to me it seems more of a physics problem. This summer I had two Polyethylene terephthalate (PETE) spice bottles deform due to the sun shining on the clear plastic tub, Polypropylene(PP) in which they were stored. The first time the big tub was...

Hello experts, I would be glad if anyone could help me find out some basic beginners materials on ORBITAL MECHANICS. I am looking for ones that would help me understand the practical and technical aspects of launching a satellite, maintaining it in an orbit, changing orbits, results of...

I've been thinking about the building-design simulation, and am hoping that someone can point me toward more complete treatises/references, than this hobbyist impression. I'm trying to develop a mathematical outline of simulated deformation physics, with the hope of eventually creating a...

I'm building a linear actuator and I don't have much experience with magnetic circuits... A rough sketch of what I'm building is attached. I'm trying to determine if the materials I'm using for the shaft and shaft collar will have a detrimental effect on overall force output. Right now, my...

I have reviewed the material covered during my sophomore year and although it does not seem like a joke freshman year was, it shouldn't be very challenging either, it includes introductions to modern physics and waves with 2 labs and mathematically linear algebra, diffyq and vector calc. If I...

Consider a piece of a deformable material with mass m and constant density \rho . To what shape should we deform it so that its gravitational field is maximum in a given point?

Hey guys, I'm having trouble with this problem set I'm working on at the moment. I'd appreciate some help with this question: (I'm only asking about number two, not one. Thanks.) The lack of a top is accounted for in the formula for the box's surface area, which should be: SA= L^2 +4HL And...

Why is it that in bulk matter , though molecules are closely packed electrons are no longer attached to individual nuclei It is mentioned in 6th line of 3.3

Hi all, I have an idea for a project whereby I there would be an electromagnet pulling on a metal weight through wood. So: Electromagnet -> Wood -> Metal The basic idea is to stick things to wood with electromagnets. Can anyone recommend a material that could be bonded to the Metal what...

Is there any such material which can be made to conduct from a non conducting state by external means like shining a light or any other EM wavelenght on it or other means , that could alter the material ohmic resistance to electric current

I'm developing a small product, And I need a material ( maybe a plastic ) for a metal part slide through. The material will have a hole and the metal part will go through but will have to be very tight hole and I'm afraid when making production obviously the measurements maybe be different and...

I was wondering how I would go about working out the energy required to cut a material (e.g. stone or steel) if given a volume, and all the necessary values pertaining to that specific material? For example, how would I work out the amount of energy required to cut a steel block of dimensions...

I am undergoing internship in an motorcycle company (OEM) and would like to know if there are any ebooks about motorcycle parts, manufacturing processes, general manufacturing practices, Engine, vehicle assembly operations and stuff like these?