Stress Definition and 1000 Threads

College Stress Help Alright I'm just going to get right to it. Right now I'm a freshman at BU studying physics, though I'm hoping to double major in math. And it has not been going very well. About a month ago I bombed my first set of midterms, but honestly I think I can attribute that to...

Homework Statement See attached jpg for problem statement and diagram. I know we didn't discuss this type of problem in class. The rest of this homework set has been solving stress transformations with Mohr's circles for a given state of stress. I know how to find τxy (that was supposed to...

Homework Statement I'm looking at some problems and solutions to them, and when they calculate shear stress instead of having the area of the thing be pi*r^2, there is usually a (pi/4)*r^2. Homework Equations Shear Stress = V/A The Attempt at a Solution I don't understand where...

A steel bar that is 16mm in diameter is resisting a force of 25kN. What is the normal axial stress in the bar(MPa) Since MPa = N sqmm would it be 25kn/(0.016m x 0.016m) Im more after the process on how to get the answer than the answer itself.

Homework Statement Determine a)where the greatest stresses are b) overall change in length That is meant to be a hollow cylinder on the bottom section inbetween the dotted lines E = 200 GPa Homework Equations σ = Fn / A ε = dl / lo = σ / E The Attempt at a Solution The book gives the...

This question is really out of curiosity, and also due to my very limited knowledge of basic physics(biomed sciences tend to not teach you this). Say I wanted to create a vacuum inside a metal cubic casing with the following parameters: -The case is a cube, that measure 1x1x1m, so has a...

id like to think i did this right, but i just want to make sure. i can't do symbols so let d equal sigma. the stress components are d_xx= 200 MPa, d_xy= 50 MPa, d_yy=-100 MPa. I need to find the max shear stress, and the principal stresses, and then a_s and a_p. heres what i got: max...

Hello everyone, I am curious about calculating the stress that acts on a hook. I apologize I could not make a small enough image to upload, but the hook is "J" shaped. The top of the "J" is held in place to prevent movement. The geometry of the hook is similar to a bar, whose cross...

Hello, so I was asked a question in two parts (Peskin & Schroeder problem 2.1). The first part asked me to derive the source-free Maxwell's equations from the action: S=\int{d^4 x \frac{-1}{4}F_{\mu\nu}F^{\mu\nu}} Given that the vector potential itself is the dynamical variable. I derived...

Homework Statement Shaft AB is fixed at point A, and has a flange attached at B. Shaft CD is fixed at D, and has a flange attached at C. The flanges at B and C are bolted together, but with bolts that are small enough to allow one shaft to rotate by 1.5^{\circ} before the two begin to rotate...

Homework Statement Homework Equations \sigma_x = -\frac{M(x)y}{I} I = \frac{bh^3}{3} The Attempt at a Solution For point A, I did the following: I = \frac{t(2h)^3}{3} I = \frac{8th^3}{3} \sigma_x = -\frac{3\tau_0}{4th} \tau_{yx} = -\tau_0 \sigma_y = 0 Are my...

Homework Statement I need help specifically with b. The inner diameter of a steel ring is 2.0000 cm, and the diameter of an aluminum disk is 2.0100 cm. Both are at 430 C. At what common temperature will the disk fit precisely into the hole in the steel ring? b) If after the aluminum disk is...

I am having a lot of difficulty calculating the cross-sectional areas necessary for normal/shear stress problems. If the cross-section is a square or circle, I'm fine, but when the problem makes a diagonal section through the object I get really confused on which angle/trig function to use to...

1. A decision has been made to make a plate out of an advanced engineering material ceramic that has better high temperature and wear properties than alloys. The plate must withstand a tensile load of 177.92kN. The part will be non-destructively tested to ensure that no flaws are present that...

Stress's for circular bar? Calculate the maximum normal and shearing stresses of a circular bar with diameter 0.05m and axial compression load of 150000 N .. I know for stress = Force / Area, how do you solve for shear stress?

Is there a way to calculate the linear change when a piece of MgO is exposed to a stress of 100 MPa?

trying yo figure this out: the graph of stress concentration factor K for flat bars with a circular hole geometries are shown in the diagram link below. a load of 50kN is applied to the plate. the width of the plate b=100mm with a thickness of t=10mm find the maximum stress for the...

Homework Statement Homework Equations \sigma = F/A The Attempt at a Solution I understand that I should evaluate the different forms of stress to find different values of the ultimate load. I also understand that I should choose the smallest value among them since anything...

Homework Statement I just want to know the difference between certain equations for shear stress. I'm trying to find the factor of safety for pins that are in double shear and have a circular cross section. Homework Equations So far I've used stress = 2F/pi*d^2 for double shear...

Hi, I'm trying to carryout some analysis of flat plates subjected to hydrostatic water pressures however the plate material is HDPE. The problem I'm having is that all the formulae on the web and in Roark's 7th Edition are typical of steel with a Poisson's ratio of 0.3. I can't therefore...

Homework Statement This is just a simple questions concerning the method of obtaining nominal stress and nominal strain. From various sources on the net they refer to nominal stress/strain as engineering strain therefore can I just use the simple equations for stress and strain? In this...

Homework Statement You have to design a rod to hold up the hood of your car. Assume the hood weighs 40 lbs, and the rod must be 3 feet long. What material would you use to make the rod? And what diameter would you make the rod? Homework Equations Stress= Force/Area Buckling equation...

Could anyone please tel me how to calculate the Bending Stress, Compressive stress and the Deflection for any beam (UB 203x102x23) subjected to Uniform Distributed Load of 8063 N/m over a 8 m long beam (simply supported beam). Thanks all.

Hi, I have a configuration in which a piece of rock is under hydrostatic pressure (see attached figure) and I'm trying to figure out what the stress on this rock will be. The boundary conditions on the Steel end plates are such that the right and left plates are restricted to move in the -ve X...

Homework Statement A simple framework by two rods linked in A, B and C. Burdened by a force F. The rods is of square cross section 30x30 mm and made by steel 1550-01 -> E = 210 GPa. [PLAIN]http://img718.imageshack.us/img718/125/ram001.jpg Determinate maximum force F and the stress in...

I am trying to do a finite element analysis ofcold extrusion process of a tube wherein the steel tube is reduced from a larger outer diamter to a smaller one by extrusion process.The tube is held stationary and the die is pushed into the tube for a particular length and then retrieved.I am...

Hi. I am trying to calculate thermal stress in a simple structure (cube) exposed to two different mediums at different temperatures. I have come across 4 formulaes, can anyone please advice on which one would be most appropriate. Please see the attached file as the fourth formulae is too big...

Hi everyone, Recently I faced a problem in calculating bending stress in a long UPN profile "flange" due to concentrated force. It seems that the regular/familiar formula for bending stress in a finite/short element does not applicable in local bending of long/infinite beam. See sketch...

Dear All, Please see the picture. I need to find the bending stress for that profile. Its hollow tube dia= 38 mm, 4 mm thick. its is acted with udl of 500 N/m2 on its outer surface. How can I estimate the bending stress, deformation. Assume it as mild steel with E = 200 Gpa, poission...

Hello Everyone, Below is a self assesment question I found in a study guide related direct and shear stress, it is in 2 parts. The guide only gives the answers. I managed part 1 but for part 2 my answer differs from the given safety factor solution of 7 mine is 12.5. In my attempt below i have...

Saw a calculation of stress in a datasheet (page14) here - http://tinyurl.com/43465sv (The device drives a Mosfet.) How do you relate the P^2 t stress calculation in the datasheet to the Safe operating area curve in a Mosfet datasheet. If the Stress is 20W^2 sec, then how do you...

HI I have a problem in ansys that made me confused...I have modeled a conceret dam and meshed it with solid 45 elements...after that I have assigned the available surface pressure on the dam to the model...in another modeling, I changed the mesh size only and analyzed the the model with the...

I have a question about how the solid respond to stress at different stages. In textbooks the slope of typical stress-strain curve decreases after a point called yield point. Why is it so? Why less stress is required to further increase the strain compared to that before yielding?

Hi, I need to use the 2nd Piola Kirchoff Stress (S) rather than the usual Cauchy stress i(sigma) in a general transport equation of a material. I was wondering if I need to replace the stress tensor (usually denoted by sigma) with S, or do I just write sigma in terms of S using the relationship...

Hi there, I've been interested in this medicine for stress and irritability however I'm always sceptical about herbal remedies. Does anybody have any input as to whether there is any reason to believe these actually work? Thanks

Hi. I am trying to calculate the thermal stresses in a steel cube which is placed inside another steel cube of bigger dimensions, supported by steel bars at the base and sides. Both the cubes are in contact with fluids at different temperatures. Can someone please suggest the methodology as i...

Can anyone help me calculate the maximum bending moments and maximum stress for the figure i uploaded please.

Hi all, I have a cantilever that is a plate (not a beam) with dimensions 2mm wide x 4mm long x 0.3mm thick. It is fixed only at one side, with the other 3 sides free. I want to be able to find the intrinsic stress on it after it is fabricated. To complicate matters, I also want to put...

i want to design a machine which is capable of applying all three types of loads that is axial, bending and torsion. Using this application of static loads , I want to measure the stress concentration factor.

I have a very fundamental doubt regarding the stress strain graph for many materials..Normally we plot strain ~stress in the graph..but it seems that stress is the independent variable and strain is the dependent variable..but still why nowhere i have found the curve as stress~strain..can...

hey Folks, Please see attachment. I'm in doubt about the equation 5.15a. Indeed, it is said on the line just above it that : "in a frame where particles have velocity Va" which means the lab frame , say. Then in this frame the time component of 4-velocity is the Lorentz contraction factor...

[SIZE="5"]A 500 kg car uses 10 kg aluminum alloy tire ring, what is the compression stress on one of the wheel rings if the contact area is 0.10 m^2 with the tire so the model answer is stress = F\A 127.5\0.1 = 12,750 Pa where did we get the force from ? 127.5 ?

in a perfect fluid the stress energy tensor is: T_{AB} = (P + \rho) u_A u_B + P g_{AB} queation1 : always u_A =1, \vec{0}? question2: if the space time have a line element h_{AB}dx^A dx^B...for the calculus of T_{AB}, ¿ g_{AB} = h_{AB}? ¿can i to use g_{AB}=\eta_{AB} if h_{AB}...

Homework Statement hi, I'm new to this and am trying to understand axial stress. here's the question I've been given: "consider the 250mm x 250mm concrete-encased steel column, shown above (picture a square with an H-shaped steel beam in it). the steel section is W150 x 22, with Es =...

When plotting a stress against strain graph is this the right equation that fits the form y=mx+c? I got (F/A)=y(dL/L) where F is force A is area y is youngs modulus dL is change in length and L is original length. The Y is F/A. The m is y and x is dL/l (in y=mx) is this correct? Thank you

Dear All, I work in an engineering company here in Abu Dhabi, UAE. Very recently, we have been asked by our clients to perform STRESS ANALYSIS FOR THE FIRE FIGHTING PIPELINES. But my engineer initially said that for FIGHTING PIPELINES, stress analysis is not required as the water is...

Why do we carry out stress transformations? tnx

What condition defines a principal stress? thx

I am a newcomer to FEM and Ansys, so forgive the possibly banal question: I have modeled a cantilever beam with a vertical point load acting at the free end using Ansys (using a PLANE42 element) and am slightly confused about the resulting plot for stress in y direction (y being the axis...

Homework Statement Homework Equations The Attempt at a Solution I'm in doubt the angle that I should be using to solve σx' and Tx'y'. Is 60 degree or -30 degree? Ps: I know how to determine the principal stresses and max shear. Just the angle that I'm in doubt at. 60 -30