Strength Definition and 1000 Threads

I am constructing a glutamine beam as part of a project and need to estimate the load at which the beam fails in bending and the load that will give deflection of length/200. I have been allowed to do a none destructive test on each piece of timber to be used in my beam. This has given me a...

I need some advice on my design for a tablet holder that I want to get 3-D printed using a printing service, not my own printer. I need to decide which material to use and how thin I can make it. I asked for advice already on a 3-D printing forum, but they could only tell to find out through...

Homework Statement Member AD of the timber truss (shown in attachment) is framed into the 100 x 150 mm bottom chord ABC as shown in the insert. Determine the dimension "a" that must be used if the average shearing stress parallel to the grain at the ends of chord ABC is not to exceed 2.25...

How strong, approximately, is the magnetic field, on a powerful electromagnet, that you buy on eBay, that can lift, say, a 100 kg?

Hello, I'm in the design phase of a greenhouse building and am tossing around the idea of not using lumber. I have put up many stick built structures but am afraid the humidity will rapidly decay a conventional pine/fir. And I want to avoid pressure treated if possible Based on a roofing...

Hi to all. I have a raw material certificate of drilling pipe - there is a YS=863 N/mm2. I would like to know what is the maximum weight in pounds this pipe can withstand.

Homework Statement From what I've read, [Cu(H2O)6]2+ when reacts with concentrated hydrochloric acid, the chloro ligand will displace the aqua ligand and form [CuCl4]2- Homework Equations [Cu(H2O)6]2+ + 4Cl- <--> [CuCl4]2- + 6H2O ( <---> means reversible reaction, I don't know how to type it...

Hi! Could you help me to find the yield strength at temperature SA-789/SA-789 М.

I think the equation for the relationship of the E (electrical) and B (magnetic) fields in electromagnetic (EM) radiation is E=Bc, where c is the speed of light. I think this is correct, but what does it tell us? On it's face, it looks as though the B field (of a photon, say) is...

Hello everyone. I have a question about compressive strength of concrete. It is said that (in my country) 150 mm x 150 mm x 150 mm concrete cube is used for concrete testing. Someone asks me why 100 mm x 100 mm x 100 mm is not used. In fact, I know that sometimes it is allowed or even preferred...

For typical metals used in construction I've seen the compression strength being used in various calculations. Typically I assume this is the uniaxial compressive strength. i.e. Say in a UTM with the specimen laterally loaded. Are there engineering situations where the hydrostatic compressive...

hi all, I am rajesh,now I am working with adhesive sealants,here,adhesive failure modes are adhesion and cohesion. In Ansys workbench how to validate the these two failures.so please give me a needful information.

I have a solenoid, Length L, number of turns N, ampers I Radius R I have a Point P(x,y,z) anywhere around said solenoid. How can I calculate the field strength at point P, note it is OUTSIDE the solenoid, and could be anywhere outside. Assume the origin is the center of the solenoid, let's...

Hello forum, could someone share a formula to calculate the flexural strength and flexure modulus of a beam with a rounded triangular cross-section? Namely triangular crayons, which is rounded on the edges. Assuming that the triangle is equilateral...

I've read a few papers regarding the effects of a uniform magnetic field on water solutions, but I'm a complete illiterate when it comes to deciphering the jargon. So far, many papers confirm that a uniform magnetic field strengthens hydrogen bonds and can increase the redox potential. I've...

Homework Statement It's been a while since I've done this, it's essentially a strength of materials problem in my mechanical analysis class so I haven't worked problems like these in quite a a while. I'm fairly confident I've done it right however I was hoping someone might be able to confirm...

Source: http://gmammado.mysite.syr.edu/notes/RN_Metric.pdf Section 2 Page: 2 Eq. (15) The radial component of the magnetic field is given by B_r = g_{11} ε^{01μν} F_{μν} Where does this equation come from? Section 4 Page 3 Similar to the electric charges, the Gauss's flux theorem for the...

So, I am watching this show about airline crashes and apparently, a A380 has gone down because the speed limiter on a spinning engine rotor broke, and the part spun so fast its ultimate yield strength was reached and the material shatterted. Thats got to be one really fast spinning rotor! But...

Homework Statement The figure shows the stress-strain curve for a material. The scale of the stress axis is set by s = 280, in units of 10^6 N/m2. What are (a) the Young's modulus and (b) the approximate yield strength for this material? Homework Equations E=stress/strain The Attempt at a...

I already posted this, but it was on the wrong section. This is from the 2009 HSC exam. (I'm in Australia) I checked the answers and found that electric field strength was E = 100/0.10 = 1000V/m My question is, what would the electric field strength be if the positively charged plate was...

I would like to build an electromagnet to accelerate electrons into a circle (a precursor to a mass spectrometer). I would like to calculate the field strength, but I don't know how because I would like to wind it out of aluminum strap salvaged from a welder, and I can only find formulas for...

How to control magnetic field produced by a permanent magnet which is being induced on to a coil ?

Homework Statement I attached a file. Numbers 10 and 12. Homework Equations kQq/r, kQq/r^2 The Attempt at a Solution I am confused about this problem. Shouldn't the electric field strength be 0 when x = 0? The charges are opposite and adding two opposite vectors with equal magnitude should...

I was just wondering why the strength of the electric fields of insulating surface charges like sheets and shells aren't dependent on the distance from the charge according to Gauss's Law?

Hi everyone, it's my first post! I need to elevate a bed by 4 inches for a while. I did some work on this problem already. Here's all the information I used to reach my conclusion: expected total weight with mattress and occupants = 220.92200 kilograms bed weight = 54 kg = 54,000 grams =...

Any one knows how to calculate the magnetic B field strength at a distance from a Large Conductor ? Do we go by average ? thanks

There's a reel of material which has splices connected by regular transparent sealing tape. The bobbin has to be heated for manufacturing. Do you think the heat of up to ~60C degrees could have an affect on tape adhesives?

Homework Statement Two 3.0 cm diameter disks face each other, 1.9mm apart. They are charged to $$\pm 16nC$$. (a). What is the field strength between the disks? (b). A proton is shot from the negative disk toward the positive disk, what launch speed must the proton have to barely reach the...

I have read that freeze drying is the best way to salvage wet books (http://www.ccaha.org/uploads/media_items/technical-bulletin-salvaging-books.original.pdf). However, freeze dryers run in the thousands of dollars, and I don't know anyone who has one I can borrow. Solution: make my own! I...

Hello, How do I take into account the difference in stiffness when fabricating a part (for example, an L-bracket) from sheet metal or using an extrusion? In particular, where I work, it is "common knowledge" that extrusions are stiffer. How do i factor this in the stress and strain...

it's been awhile for me so check if I'm remembering this right... Thanks. electric field strength is inversely proportional to distance squared... right? So if the electric field strength is 1,000 mV/m at 1 meter then the following is true... right? km______mV/m________ the math 1________1000...

Homework Statement I am doing a project which involves making furniture out of beer/soda cans but I need to do some calculations for it. I know the can can hold around 52 Kg or even more based on experimental results but is there any way to find out with some formulas? I found it tricky because...

Homework Statement So I've been trying to derive field strength tensor. What to do with the last 2 parts ? They obviously don't cancel (or do they?) Homework EquationsThe Attempt at a Solution [D_{\mu},D_{\nu}] = (\partial_{\mu} + A_{\mu})(\partial_{\nu} + A_{\nu}) - (\mu <-> \nu) =...

Homework Statement Hi guys, I have a question here, which asks me to express the maximum stress from my simply supported beam, which I worked out to be 1.165MPa, to be expressed as a percentage of the Yield strength 95MN/m^2. I also have a follow on from that which asked me how much the...

Greetings, may I ask for a bit of help with a steel fabrication project? Pictured below is my design for a trailer-hitch mount to be used with a Harbor Freight tire changing tool. I need help determining the thickness and composition of the tube and plate steel to be used in the project. I...

1. Calculate the gravitational field strength at 500km above Mars' surface. Mass of Mars: 6.39 x 1023 kg Radius of Mars: 3.39 x 103 km Constant G: 6.67 x 10-11 2. I used the equation g = GM / r23. To begin with I added the 500km height above ground to the radius, giving 3.89 x 103 km. I then...

Homework Statement In a probe that uses the Hall effect to measure magnetic fields, a 11-A current passes through a 1.33-cm-wide and 1.31-mm-thick strip of sodium metal. If the Hall emf is 2.42 μV, what is the magnitude of the magnetic field (take it perpendicular to the flat face of the...

Homework Statement There exists a current of 5A in the ay direction at x=2m,z=-2m where the ay is the unit vector in the y direction. Find the magnetic field strength at the origin. Homework Equations B = (μI/2πR) * r B = μH The Attempt at a Solution B = (μI/2πr) B= (4π*10^-7)(5)/2π(2) where...

Homework Statement A long solenoid has 35 turns/cm. With a current of 4.0A, what is the field strength at the core? Homework Equations \beta = \frac{\mu N I}{2r} The Attempt at a Solution I have no idea with the radius is; that's the entire problem statement above.

Hello, My friend needs to transfer construction objects across a pond, came up with this idea of tying a rope between the pond and a big tree then transfer objects through a pulley, I'd like to know how to calculate the tension and will the thin concrete wall withstand the load? Here a diagram...

Hi all, I have two identical magnet which measures 0.6T when I put my gauss meter on the top surface. I configured the magnets as below: I would like to know what should I expect if I measure the strength(Tesla)at the red round dot position? Would it be 1.2 tesla? Please advise. Thank you...

In the photo of a container ship cargo seems stacked 12 high. I do know that there's lateral supports etc. that are not visible in the figure, yet the vertical load, isn't that transferred downwards to the bottom container? Or is there some way to support the stack at an intermediate point so...

Just one last question today if someone can help. I'm trying to derive the electromagnetic field strength tensor and having a little trouble with (i think) the use of identities, please see below: I understand the first part to get -Ei, but it's the second line of the next bit I don't...

Homework Statement Specify the strength of the electric field. Let r = 7.3cm . Homework Equations E1= (k*p)/(r^2+a^2)^3/2 Here k= constant used in Coulomb's law. a= half the length of dipole p= dipole moment = charge x length of dipole. Charge = 3nC and length of dipole The Attempt at a...

Hello everyone, I have designed a part that should be able to withstand a shear stress of 43 MPa ( give or take). The part will be made of Nickel Aluminum Bronze (CuAl10Ni5Fe4). When I check yield strength values for this material (I'll multiply it by 0.6 to estimate its shear strength), they...

Homework Statement Given that we are working with biological samples of 5 and 10cm, is our assumption that the equation N = No e¯kt represents the radiation strength accurate? Explain. Homework Equations N = No e¯kt The Attempt at a Solution I'm completely stuck but... I believe it...

which commercially available material has maximum strength but minimum weight ?

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...

So how do I figure out if say a part is being made with a .250 round dowell pin at 100,000 yield strength and I want to use a material at 60,000 yield strength how much bigger would I have to make the dowell pin to achieve the same yield strength?