Material Definition and 1000 Threads

Hello! I'm looking for a substance that can: (1) be turned into a flexible material (e.g., a flexible plastic), (2) is dissolveable in rubbing alcohol but not water (or blood), and (3) safe for a medical procedure ... And, if possible, preferably biodegradable... I know that's kind of a...

In classical mechanics, to raise from some height h_{0} to infinity over a gravitational body, takes a certain amount of energy, the energy associated with escape velocity, let's just call it ε. ε = \lim_{t\rightarrow +\infty} \int_{h_{0}}^t ƒ(h)dh Likewise, it's time-reversible, so dropping...

That's the question. When I ask that I'm talking about science books, most importantly, Mathematics and Physics. My aim is to avoid taking notes, I think it would be a waste of time if there are summarized books out there. For example, there could be summarized books written for refreshing...

Homework Statement You have a new unknown material. You want to get a rough approximation as to the location of the unknown material on the electrostatic series. You only have two tools at your disposal; some wax and a charge detector. Design an experiment (procedure) that will help you...

Hello dear friends, I have recently found a material that will be really interesting for its tribological properties (for my master thesis)... in the mall ! It is used in Samsung kitchen ovens : some kind of a joint to hold the cavity separator (a plate that divides the oven cavity in 2)...

Homework Statement The following coil-wound core (core length = L , Gap length = lg, cross- sectional area = A , core permeability = only hysteresis graph is given, N = N turns) is driven by a Voltage source, is known that the current in the coil is 60hz AC. Determine...

At M.V. (10.5KV), what is the difference in material between 1250A, 40KA busbar & 1250A, 50KA?

Does anyone know where I can find some material (for free) on IDL? I'm new to programming, and I would like to teach myself this language. I would like suggestions to material that is "novice" friendly.

I'm working on an engineering problem where we are using Teflon as a low-friction material as a surface for plastic parts to move above. However, the material is wearing faster than expected due to the plastic rubbing away at the Teflon. Is there a non-metallic material that has equal or...

Hi, As far as I know, every material has different sets of natural frequencies associated with it. For example, A simple one dimensional oscillator with stiffness "k" and mass "m" has a formula for calculating its natural frequency = 1/2pie*squareroot(k/m). I was wondering if there are...

Hi, I'm looking for a shape memory material with this features: - return to his original shape by electric hit or by folding manual - flexibility - strong enough to swipe another flex material. Thank you.

I am working with a set of alloys that must first be ground up in a ball mill at cryogenic temperatures. It is important that no contamination makes it into the material and careful steps are taken to ensure this end. Unfortunately when we ran a set of samples through our RBS lab and then again...

my friends, i am struggling wit the identifying of my material.My material is the spring of the suspension of bicycle,material is steel but how .I am sending some photos ,please help me this is my final project

I am interested in locating a material that can withstand a strong alkaline medium (10 M KOH) and approx. 5 atm pressure... I am somewhat new to material chemistry so all I have been able to think of thus far is PVC pipe. Through my research I have discovered that PVC is highly fire retardant...

Hi all again, I started a post earlier and it was buried somewhere by now. I really need more input and information and hope you all can help. How are admission process different, CM vs MS&E? CM belongs to Physics department while MS&E is usually on the engineering side. I got my Physics...

Good evening. I'de like to know if exists a material light, cheap and strong as wood material, capable of handle maximum 100 pounds. . that's for a portable massage table structure.

OK, this is embarrassing, but I never looked carefully at this elementary point. We say that if p implies q P is the set of all things for which p is true Q is the set of all things for which q is true then Q ⊆ P. Also that the set of all things for which p&q is true equals P∩Q But p & q...

I am a part C Mechanical Engineering student and have been undertaking a project investigating the strain sensitivity of a particular glass filled composite. From my quasi-static results, the stress-strain curves seem to be reasonable and match that of the mechanical material properties...

I am a part C mechanical engineering student and require some advice for my individual project, which is based on the high strain-rate testing of a particular glass filled composite material using a split-Hopkinson pressure bar (SHPB) experiment. I gathered the results on a SHPB test rig and...

I am working on a project for which we have to design a Light weight tricycle. I want to know the procedure for selecting a light weight material for the chassis, which has good stiffness, economically available and good weld ability. We also have no constraints on the cross section of the pipes...

I want to create stress/strain curves for Higher Strain Rates from an available stress/strain curve? I am interested on the mathematical formulation aspect to generate a Dyna Material card.

When an external magnetic field is applied to a diamagnetic materials, their atomic current loops will tend to align in such a way as to oppose the applied field. Diamagnetism is the residual magnetic behavior when materials are neither paramagnetic nor ferromagnetic and most materials are...

I have heard that AntiMatter is the costliest material on Earth costing around $62 trillion per gram. How true is that and why? Who calculated this? What does antimatter do? Please shed some light. Thanks!

Hi guys, So, I'm a high school senior about to graduate, and because of reasons, I most likely will not be attending a college next year. However, I will apply to colleges next year for a Physics major. In the meantime, I would like to use my time wisely, and I was thinking that the smart thing...

Hello, I am confused with casting grades of different steel,for example 316 SS has casting grade CF8M. What does it mean and where can i find grades of other materials as well like 316L, 304L. 304, CS, etc. Any data sheet showing grades for every material will be helpful. Thanks

Hi guys, I'm having trouble with this book - "Introduction to Probability and Statistics for Engineers and Scientists" by Sheldon M. Ross. The explanations are very short and often lack necessary details, the examples are very hard and apparently some full of errors. I just can't study from it...

I am looking for a material that I can bend easily into different desired shape frequently without breaking or losing strength. The material can either be elastic or not elastic. I know sheet spring can do but if I bend it like 70 to 80 degrees will it permanently deformed or become fatique...

Hi, I've learned that material derivative is equal to local derivative + convective derivative, but can't seem to find out which way the convective derivative acts, like for example in velocity fields: The equation my teacher gave us was (with a and v all/both vectors): Acceleration = material...

Hello, I would need help. Need help choosing the material for sealing: o-ring, shaft seal. They will use the equipment that will be installed on board a seagoing ship. The conditions are: - Resistant to seawater - Withstand temperatures of -32 ° to + 60 ° or -25 ° to + 60 ° - And chemical...

Hi. I am using Material Studio (MS) version 4.3 (yeah I know it's old but that's all I've got) and I have been trying to calculate this energy of a specific compound (N,N-dimethylformamide). I've learned that there are 3 ways on how to calculate energy using MS; Forcite, Dmol3 and Minimizer...

So i have been given a practical for a non-hookean material i.e. polymer, we were to add weights progressively and then taking them off one by one. After doing so i plotted the weight attached to the polymer vs the length stretched for both adding and removing the weights on the same graph. The...

I have measured the conductivity of a 2D material. I want to use σ=N⋅e⋅μ to find the mobility μ=σ/(N⋅e). https://en.wikipedia.org/wiki/Electron_mobility#Relation_to_conductivity I have measured N using a spectroscopic/imaging technique to get a Surface Density with units [cm^-2]. Mobility...

Homework Statement A certain material is kept at very low temperature. It is observed that when photons with energies between 0.23 eV and 0.85 eV strike the material, only photons of 0.37 eV and 0.64 eV are absorbed. Next the material is warmed up so that it starts to emit photons. When it has...

Two liquids, A and B, are mixed together. A is 5.00% solids, the rest water. B is 11.0% solids, the rest water. To the mixture is added 18.5 kg of bone-dry solids resulting in a mixture of 2 150 kg containing 8.25% solids. What were the original amounts of the liquids A and B?

It is my understanding that a photon is absorbed when the photon's energy is sufficient to excite an electron into a higher energy state. So if I shine a light unto a light absorbing material, let's say a thin black metal, then why the surface never reaches a saturated state? I mean, if we...

Hello all, whether the Refractive index of piezoelectric materials (Example: Polyvinylidene fluoride-PVDF ) changes by the application of pressure, strain or force ?

Homework Statement A cylinder made out of AL 6061-T5, dimensions d 10mm, L 28mm. Is put into an oven pre-heated to 100 deg C. How long will it take for the cylinder to reach 100 deg C ? Homework Equations None given, this is not a homework question or even material I have been taught. I have...

I feel as though my ability to properly write up lab books when I do/after I do experiments is really weak. I struggle to analyse the data in a meaningful way. I don't know how to/when to calculate errors properly. I'm near useless when it comes to logarithmic graphs, or inferring any important...

I know that in a vacuum, speed of light is constant. My question is more about the speed of light in a material like air. Dispersion of light in a prism tells us that the speed of light or the material index depends on the wavelength ( or frequency which is constant ) so I thought that air...

I don't know if this is the right way of describing it, but I need to activate an area of capacitance on a touchscreen by applying some current to a piece of conducting material like tinfoil. I am needing to remotely turn pages on a touchscreen ereading device with a microcontroller, and this...

Hi all, I want to get some sort of polymer that is opaque to infrared (absorbs wavelengths above 700 nm very well) but transparent to visible light (does not absorb much light below 700 nm). Does this even exist without being a meta material?

which commercially available material has maximum strength but minimum weight ?

In stories regarding the "Roswell UFO crash", there are claims of alien metal foil that (depending on who you ask! :) ) you couldn't cut with a knife, couldn't tear it by hand, and which you could crumple up, and when released from your hand, it would unfold again to a nice, smooth sheet. Now...

Hi all, I am wondering how is it possible that the polarization effects of a dielectric material remain confined inside the material itself. That is: for a LIH dielectric, the equations state that the electric field inside the material is reduced by \epsilon_r. But outside the material, no...

Hello. I am thinking about creating an extremely lightweight running shoe to simulate barefoot running, and I need help on picking a material for the sole. 1. It has to be cheap 2.It has to be strong 3.No Metal 4.It has to be extremely bendable(able to role up into a tube)

hello! is there a material or substance that can be detected using some kind of waves (magnetic, electromagnetic, ultrasound, infrared, whatever, etc) with extreme specificity (ie. no other materials or substances are to be mistaken) with extreme sensitivity (ie. a nanometer of that material or...

Hello everyone! First time asking a question here, go easy on me! I am a first year Mech-Eng student in Ireland, and I need some guidance from one of the amazing brains here at physicsforums. I am told by my thermofluids lecturer that in thermal expansion, the amount of material expanding is...

I am helping one of my old physics professor and his Phd design a low-atmospheric vacuum chamber and we're looking at different materials to prevent outgassing. However the tank is almost 1m long and all the equipment inside must be taken out and checked after each test. It would be nice if we...

hi all, I'm creating a physics based game. My design works by pre-fracturing objects into distinctive chunks at authortime, to prevent extensive processing later (some realtime fracturing will also occur, but that's unrelated). So i have lots of walls that are made up of lots of little chunks...

Hi I have a the problems! i need this materials for dielectric : 1.pvc (Kg) 2.dop (Kg) 3.carbonate (kG) so, i Specify this propertise for dielectric : 1.T(Tensile strength) =16 2.E(elongation) =300 3.Density=1.45 4. H(Hardness)=78 now, I need to...