Thickness Definition and 349 Threads

Hi, I am working as a design engineer. I am new to pressure seal bonnet Valve design. In that valve concept we are using a ring called as Retaining ring. The purpose of this ring is to withstand the entire force acting on the bonnet due to is working pressure. Now i want to know how to calculate...

Hi, I am working as a design engineer. I am new to pressure seal bonnet Valve design. In that valve concept we are using a ring called as Segmental ring. The purpose of this ring is to withstand the entire force acting on the bonnet due to is working pressure. Now i want to know how to...

Hi, I tried to find design regulations/codes that specify relations between bolt diameter/bolt length against connected plate thicknesses. I couldn't find that in Eurocodes 3. Can someone help me with info where to find those regulations ? Example: can we connect 5 mm plates using M24 ? or...

Hi guys I am working on some project that involves pipe wall thickness calculation, and I have one problem. here is the explanation of the example: http://pokit.org/get/?24c6e34b749030e74662402372ce5fc7.jpg Please, can some one tell me what means tf/m2 (ton force/square meter ?) and how to do...

Homework Statement We have two coaxial cylinders with radius r0 and r1. The space between the two cylinders is completely coverd with two coaxial isolation layers with relative dielectric constants ε1 and ε2, ε1 is for the inner layer. Calculate the thickness of the inner layer such that the...

When modelling the heat transfer through a plate using fouriers equation, what difference would it make if the width and length of the plate were set to a specified value rather than being infinite?

Homework Statement A thin film of oil (n = 1.50) is spread over a puddle of water (n = 1.33). In a region where the film looks red from directly above (λ = 626 nm), what is the minimum possible thickness of the film? Homework Equations 2nt = (m+0.5)λ t = (m+0.5)λ/2n The Attempt at a...

we are building a hydrotesting chamber, the steel plate will be a sheild wall. if something goes wrong in pressure testing the steel plate should withstand the pressure without deforming, i am stuck in how to calculate the thickness applicable to withstand it. hydrotesting pressure is 25,000 psi...

How thick would a 4'x8' aluminum plate need to be to hold 1 atmosphere in space? What about a 4'x8' sheet of glass?

thickness of steel plate required to stop interaction between 3' dia neodymium magnet

Hi everybody, I want to design two industrial vacuum distillation systems. The dimension of my distillation tanks are as follow: (1) A Horizontal Cylinder Tank with 200 cm length and 200cm diameter (total volume = 6300 liter) (2) A Horizontal Cylinder Tank with 400 cm length and 290cm diameter...

Homework Statement In a book discussing a simple electrical circuit it said "If a thick wire is used in the experiment, the current will be extremely high for a very low voltage. The wire can get very hot very quickly". This got me thinking about fuses in plugs. Is the fuse in a plug a thick...

Homework Statement I want to built a simple ultrasonic thickness gauge for my final project. I have already search in google about that simple electronic circuit but i can't found it and also i have already looking for tutorial video in youtube about how to built simple ultrasonic...

Hello guys I am working on designing somethings and I am using metal tubing. I do not know what type of metal tubing I am going to use this all depends on the math after I work my problem out. I am not sure what formulas to look up or what strength test I need to look up. For example if I have...

The formula for Helmholtz coil is given by mu*(0.8^1.5)*nI/R, where I is the current, n is te number of coil and R is the radius of the coil. Now assume the bunch of coils have a small 'thickness' w (so it looks like a hollow cylinder with a very small height), and the the two coils are...

I have a 300 mm diameter hole in the ground surrounded by concrete. This hole will be covered by a steel plate. I need to get a machine of weight 2.5 tonnes across this hole safely without any bending of the steel plate. How would i calculate the required thickness of the plate? Thank you Ron.

Here's something I can't get my head around: Take a diode (can be schottky, p-n etc) where the predicted depletion region is larger than the actual thickness of that layer will ever be. What happens? I've seen papers where its assumed that this curtails the built in potential. But it sounds...

Hi guys, Quick question, How do you calculate the min. weld thickness needed for an allowable stress? You calculate shear flow I assume? Thanks in advance!

Is there any program can estimate the thickness of thin film using transmittance and reflectance data ?

Homework Statement Consider an n-type Si (Eg =1.1eV, ED=EC, εr=11.8) with a bulk doping density ND=1×1017cm-3, a density of acceptor type surface state 1×1014 cm-2 and these states are at the middle of the band gap. Evaluate the amount of: a) band bending b)depletion layer thickness c) density...

Homework Statement This is a question on multiple coulomb scattering in a wire chamber momentum p = 500MeV/c wire resolution = 120 microns distance from wall to wire = 0.01m radiation length of wall material X_0 = 2E-3 m mass of charged particle m_{\pi} = 139.6 MeV/c^2 charge z = 1 How thick...

Homework Statement A highly reflective mirror can be made for a particular wavelength at normal incidence by using two thin layers of transparent materials of indices of refraction n1 and n2 (1 < n1<n2 ) on the surface of the glass ( n>n2 ).(Figure 1) A)What should be the minimum thicknesses...

Hello everyone, not sure if this is the right forum to post to, but I hope you can help me out. I am not a math person and am completely dumbfounded when it comes to engineering. I believe my request should be pretty straightforward for a person with the right knowledge. Basically, I'm thinking...

The thickness of an unexposed filter is 40um and a diameter of 46.2mm. I have an exposed air sampling filter with a mass concentration of the particulate (from gravimetric analysis) 20.1ug/m3. If I assume that the particulates are uniformly distributed in the surface of the filter, is it...

Homework Statement Is there any way we can measure the thickness of an exposed PTFE membrane air sampling filter? An unexposed filter (from the filter datasheet) has a thickness of 40μm. We have 5 ambient air exposed filters with the following mass concentrations: 1μg/m3 (filter 1), 20.1 μg/m3...

Hi, I have two 1.5 lifting lugs supported in the roof of a concrete tunnel 3.5m apart at a height of 7m. The lugs require load testing and as per AS4991 require load testing to double the W.L.L therefore 3 tonne. My work has a 5 tonne RUD lug readily available therefore was thinking...

Hi, i am wondering how do you calculate the minimum film thickness between two plates, one smooth surface and another surface with a square microasperity. i am just very confused as to how do you determine the film thickness in between them. I have attached a paper which has a graph on...

Calculate the thickness of the boundary Layer δ at a location x= 0.3m along the chord length of an aircraft wing at each of the following velocities. (u = 20, 40,60,80,100 knots) Assume ISA P=101325 R=287 T=288.5 μ =18 x 10-6 (1)Re transition=5 x 10^5 (2)δ Laminar = x 4.91 Rex^-0.5 (3)δ...

Homework Statement A single roomed building measureing 12.0m x 12.0m x 2.5m is maintained throughout the day at a temperature of between 18-23°C. Each wall is to be constructed from 2 layers of common brick, an internal particle board and a layer of insulation. The building is heated using...

Hello all, I am doing a SOL 600 analysis but Nastran gives me an error of "zero thickness" in some elements. Obviously, I checked those elements and they have properly defined their properties so I don't know what can I do. I've done a lot of linear and nonlinear static analysis in that...

I'm planning to deposit a thin layer of a gel (~10 - 100 uM), which will later be heat cured using a spin-coater. I've looked at a few models to predict the thickness of the gel based on experimental parameters (rpm, viscosity, time, etc.) but am still unsure on which model is the best to go...

I am setting up a numerical simulation from a 2D discretization of the heat equation in cylindrical coordinates. my spatial variables are radius (r), height (z), and azimuth (ø). The assumption is that there is no gradient along the azimuth direction (if temperature is T then dT/dø = 0)...

I'm building a 6'x12' steel platform that will be 3' elevated from the ground. How can I determine what load bearing weight will be if I use 2" Square Tubing, 1/4" wall thickness and then use 1/4" angle iron for the platform structure? I was going to use 2" Sq tube, 3/8" thick, but most local...

Hi, In my design there are PCB boards. But i am worried the thickness of PCB will not be strong enough to withstand cracking and warp-age when under stress and strain. Is there any formula i can use to calculate vibration on the PCB so i can increase thickness via mechanical ribs...

Heat transfer -- aeroheating and material thickness I'm trying to size the thickness of a shroud to encapsulate a payload on a small rocket. We're using carbon fiber pre-preg (k=6.83 W/m-K) and (per the aeroheating analysis based on the trajectory) the max heat rate is 908 kW/m^2. The...

Homework Statement A 490 pF capacitor consists of two 19 cm -radius circular plates, insulated with polystyrene Find the thickness of the polystyrene. Homework Equations d = (ε_0 * Area * K) / C The Attempt at a Solution I converted 490 pF to F 4.90 * 10^-10 F I...

Homework Statement A ray is deflected by 2.37cm by a piece of acrylic. Find the thickness t of the acrylic if the incident angle is 50.5 degrees. http://imgur.com/kx2VT5c Homework Equations n1sinΘ1 = n2sinΘ2 The Attempt at a Solution n of acrylic is 1.5. Therefore, the refracted...

Hello guys, i have a problem in determining a thickness of a plate. i have a motor (m = 17 kg) attached to a plate. the design can be seen in the attachment. i need to know the dimension of "t".

Vacuum pressure for design of pipe Dear experts, I have a line pipe which internal design pressure is 98 bar,dia is 36: thickness is 13 mm,length is 12 mtr. I want to know that how much vacuum pressure sustain by this line pipe? Regards, Satish patel,

My task is Let's consider a model made up of two horizontal layers: the upper layer has a velocity Vp1=3.0 km/s and the lower layer (or half space) has a velocity Vp2= 5.0 km/s. Aseismic experiment is conducted at the surface and showsthat the P wave refracted in the lower layer has a...

Hi all. I was wondering if anyone knows of an equation to use to calculate the thickness of a plate to withstand a pressure of 100psi. I am using an injection molding process where the walls of my mold will be subjected to 100psi, so I need to calculate a plate thickness that can withstand this...

Homework Statement Let's consider a Tokamak with major radius R=1m and minor radius a=0.3m, magnetic field B=5T with a deuterium plasma with central density 10^{20}m^{-3}, central temperature 1keV and parabolic temperature and density profiles \propto (1-r^2/a^2) a) Find the electronic...

Homework Statement The index of refraction of glass can be increased by diffusing in impurities. It is then possible to make a lens of constant thickness. Given a disk of radius a and thickness d, find the radial variation of the index of refraction, n(r), which will produce a lens with...

Homework Statement A flat plate moves in water (20°C) in the direction of the plate at a speed of 1 m/s. What is the boundary layer thickness 0.1 meter downstream of the plate?Homework Equations Reynolds number: ##Re_x=\frac{xU_∞}{\nu}## Boundary layer thickness for laminar flow...

20 m3 of gas at a pressure of 25 bar is to be stored in a cylindrical pressure vessel 2 m long. Given the following information : The yield strength of the vessel material is 14,000 psi If a factor of safety of 5 is to be used, determine: (a) Whether the vessel should be treated as a...

The term yield strength is always bugging me deciphering the actual use in some cases. If I had a plate 3m x 2m 30mm material of Yield Strength 355N/mm², does this mean the maximum allowable force at one point on the plate is 10,650N (355 x 30mm), not taking into account safety factors...

Homework Statement Hi, We're doing an experiment of measuring the thickness of a hair using a laser. So we took a hair, and a laser, and shot it through the hair, to receive the following pattern on the wall. The image of what we received (after red filter applied) on the wall is...

Homework Statement You are coating a glass lens of index of refraction 1.6 with a film of material of index of refraction 1.7. You start with the thinnest film possible that creates a strong reflection for 610 nm light. You gradually increase the film thickness until you again get strong...

Hi guys, Say we have a balloon, not completely inflated like in the sketch picture below. I would like to come up with a set of equations connecting between the increase in pressure inside the balloon and the change in the following dimensions as a result: 1. "neck" length (shown as 40mm...

I'm working on a project where I know that force will be applied by a bolt pulled through a hole in the center of an aluminum plate for load testing purposes (2200 lbs, actual worst case max force around 1500 with a 1.5 times safety factor), the dimensions (27"x6.25"x?), and the material (5052...