Stress Definition and 1000 Threads

So I am trying to figure out this shear stress problem that I have no idea how to approach. I have a shaft which is transmisitting a torque. It can be locked to its housing by using a pin which passes through it radially. I need to know that the shaft won't snap when transmitting its torque...

Homework Statement A solid circular steel drive shaft is 4 m long and 60 mm diameter. The modulus of rigidity of the steel is 85 GPa and its maximum allowable shear strength is 150 MPa. The shaft is used to transmit a power of 30 kW while rotating at 500 rev/min. Calculate the following...

My question is regarding exercise 5.1 on page 141 of MTW. How come the tension and the pressure have the same value ? The field lines here are they the field lines of the electromagnetic force ? Thanks,

Hello, I would like to compare rods made of different materials based on the amount of force or stress they would generate when fixed at both ends. normally, I would just compare the product of the coefficient of thermal expansion ( \Alpha ), change in temperature ( \Delta T ) and modulus (E)...

i don't know whether to use the yeild srength or allowable stress to determine section sizes of a beam please help me :) thank you.

Homework Statement find all elements of maxwell stress tensor for a monochromatic plane wave traveling in z direction and linearly polarized in x. Homework Equations Tij=\epsilono(EiEj-(1/2)\deltaij E2+1/\muo(BiBj-(1/2)\deltaB2 The Attempt at a Solution So i found what E and B is well not...

im currently stuck on a stress analysis question, the question is the following: for the section shown below, derive the following: x, y, Ixx, Iyy, Ixy, theta, Iu and Iv 50 ___ yy |---| | |---| | |---| | |---| +------ xx |---|___________________...

Dear forum, I need some guidence on how to solve shear stress on a pin and the hole compression due to force load on the pin. I haven't provided number as I can work those out later, but simply I am asking for a step by step! [PLAIN]http://img835.imageshack.us/img835/8623/problemsb.jpg

I've been reading my strength of materials text about design of steel beams. I understand everything up to the point where the text tells me to use the average web shear stress (V/dt) instead of max shear stress (VQ/It) to determine if a given beam is within the allowable shear stress. I...

Dear all, I having a trouble in defining 2D and 3D stress . As I know Maximum principal stress in 2D and 3D cases is totally different. In which condition we should apply 2D stress formula and when we need to use 3D stress formula?

I was doing a FEA Stress Analysis of an Alum (6063 T6) part and set the Ultimate and Yield Strength of the material lower to model the behavior at 150 degress C. The displacement (movement) of the model was exactly the same for relatively small forces. The force was 110 N and the Ultimate...

Hello I have done a Soderberg shaft design calculation, taking into account the stress concentration for a keyway. However, I've just noticed that I might need to adapt this for a feather type keyseat, or 2 (parallel, 180deg apart) keyways in the same cross section. I'm sure I read...

Hi All, I am going to perform stress analysis on a helicopter landing gear. My job is to find one specific landing gear, study its design, analyze and through tools we learned in the strength of materials class, redesign the gear to improve it. If you have knowledge of this sort of...

Hi all, I have a question. Does exists a software that is able to calculate creep and stress relaxation of a model of springs and dampers? Is Matlab/Simulink able to do this? Thanks in advance.

Normal stress problem,.. Help me :( link BD CONSIST OF SINGLE BAR 30MM WIDE AND 12MM THICK. KNOWING THAT EACH PIN HAS 10MM DIAMETER. DET MAX VALUE OF AVE. NORMAL STRESS IN LINK BD IF A.) ANGLE = 0 DEGREES, B.) ANGLE = 90 DEGREES.. http://i356.photobucket.com/albums/oo7/hids0902/fcdsafdsa.jpg

Howdy ya'll, a relatively simple question, A circular bar 20mm in diameter and 1m long is subjected to an axial load of 50kN. Determine: (i) The normal stress. (ii) The normal strain. (iii) The elongation. Assume the material is steel with an Elastic Modulus of 200GPa. ok so i...

Hi. I was assigned this coursework by my lecturer. The problem is I have only been taught how to analyse a solid beam section and not a hollow section as is shown in the problem. What I would like to know is how to calculate the area. Usually I would do this by calculating Length x Breadth. I...

Hi Guys, So I am biting off more than I can chew with my latest project.. and looking for help. I am going to fabricate a kit car chassis, The suggested material is 1' x 1' steel box section but why? Could anybody help by suggesting the kind of calculations I would have to research...

using excel 2007, can the construction to determine the proof stress of a material not be done manually? if so, how?

Hi everyone, I am a second year physics undergraduate and I have recently become worried about being employed, even with higher education like a phd. Because of such anxiety I've explored the option of becoming an investment banker on Wallstreet, but I would like to know more information...

Hi i was wondering if anyone could help me by showing me how to re-arrange this equation: a=2b*(c\d)½ i need to make c the formula. Any help would be greatly appreciated. Chris

Homework Statement If stress is given by equation 1 which implies that stress is independent of material and the 2nd equation implies it depends on the material. Inst it a contradiction? Homework Equations Normal stress is given by \sigma=f/A (1) and \sigma=E\epsilon (2) The...

If a uniform beam was in space (no gravity or resistance of any kind) and only was applied a force F on only one side, does the inside of the beam feel a stress and deform? If so, what does the stress equal? Can you explain why/why not the beam feels a stress or not? I know that that if...

Homework Statement What is the maximum normal stress in the beam and where is it located? The beam is 1m long, 0.2m high, and 0.05m thick (out of the page). The Modulus of Elasticity is 100Gp. The force is applied at an angle of 20 degrees with horizontal. | |____________ |...

Currently I am studying the mechanical properties of artery tissue, and was tasked with determining if the tissue fails due to shear stress or shear strain. I have always worked under the assumption that they go hand in hand with each other, but the nature of this question obviously suggests...

Please refer to the diagram attached. I am trying to work out the peak stress and deflection of a vertical member in a simple steel frame. I know that the vertical member will be subjected to a buckling stress, but I'm unsure as to whether the moment about O caused by the cantilevered...

It is easy to analyze a cantilever beam of constant cross section and point loaded at the end for stress and deflection. But what about including a gusset support? Is there a method to analyze this?

Hello everybody out there! I've recently got a stroke of what is called 'brain fog' on other internet pages. The reason I take this up is that I need some help on my perspective conserning my studies. Besides I think there's many people out there that have the same problem as me. If you...

Hi, I need to get the stress components on a window glass using photoelasticity technique. How can I now the minimum amount of stress that can be detected using this technique? Thanks!

Hi guys. Hooke's Law is stated as: Stress is proportional to strain within elastic limit (or load proportional to deformation). But I can't really figure out why this happens. I mean what is the cause of this proportionality?

Homework Statement I have attached a copy of the assignment problem. I have been having serious trouble finding the value of the force P. I know the equations to use for part b and c but I need to know the force P to complete the rest of the problem.Homework Equations a) The problem tells me...

Homework Statement A uniform elastic plank moves due to a constant force F distributed uniformly over the end face. The area of the ned face is S and Young's modulus = E . What is the average strain produced in the direction of force ? Homework Equations E*strain=stress... The...

Hi, I have a problem in classical field theory. I have a Lagrangian density \mathcal{L}=\frac{1}{2}\partial_\lambda \phi \partial^\lambda \phi + \frac{1}{3}\sigma\phi^3 . Upon solving the Euler-Lagrange equation for this density, I get an equation of motion for my scalar field \phi (x), where...

help: Abaqus--why not get the correct stress? with inp file. hi, all, the attachment is the calculation inp file for the stress of pipe. but now i can not get the correct result. pls help me to find the error. thanks in advance!

Ansys WB, getting non-realistic stress conce. (stiffener tip on pipe column face)?? Hi, I am facing a problem in getting accurate stress in Ansys WB for stiffened base plate supporting pipe column (See attached pics) The problem is that I'm getting very high stress concentration at the tip...

Hi all, I am trying to calculate a value for stress in a right angled bracket. this would be simple for me if the load was a static load, it would cause the bracket to bend around a point etc so i can get moments to find its bending stress. however this bracket will be stopping a moving...

Homework Statement http://img17.imageshack.us/img17/5112/ph2b.jpg a) This steel beam has a quadratic cross-section (A=100mm2). The force F is 10 kN. Calculate the stress in the rod and show that this stress does not exceed the yield strength of the...

Hello... first of all, this is my first entry, couldn't find anything similar with the search function... so here is my problem.. Out of personal interest, i want to know if there is a formula to calculate the stress on a block of metal with two holes. One of these holes will be used for...

Homework Statement Hello, I've been given a question: The ultimate strength of a round steel rod is 560MPa. If a factor of safety is 6 is required, what is the maximum permissible load for the rod if it has a diameter of 6.9cm? If anyone can explain how to set up this...

Hey so I am currently trying to calculate whether or not we can lift a giant tank made of corrugated sheet metal. I am looking for conceptual answers here, but will give some details. A potential plan is to place a number of D-bolts (let's say 8 for now) through holes near the top of the...

Hi I have found out which truss member that have compressive stress, and which have tensile. Now I have to select the metal for each member, I know how to find it when it is simple tensile stress (Sigma=Force/Area) But I think there is another equation when it is compressive stress, or...

Can anyone tell me why this is true? I can't find an explanation anywhere, and it doesn't make sense to me geometrically either, especially for i=j. Isn't viscous force, by definition, a shear force? How can it produce a normal stress? Also why would Txy=Tyx? Why can't they be different...

Hi, I have been looking at hoop stresses and the information I have found hasn't been all that useful to me as I am having a hard time converting the thermal contraction of a system into a pressure for the equation (stress=a+b/r^2). This is the thick walled hoop equation The disc is a few...

Homework Statement The elastic limit for a type of material is 1.6 x 10^8 Pa.Determine the minimum diameter if a wire which is made of this material so that it can support a load of 100N without the stress exceeding the elastic limit. Homework Equations elastic limit=stress...

Hi I am trying to solve this problem. I will present my solution though I couldn't get the tension right. At 40 Celsius , there is no tension in the wire. When the wires are cooled , they contract and the tension increases. But the tensile stress, which is force per unit area, will remain...

Right this is the question, Determine the yield stress for a metal with an average grain diameter of 0.045mm, if the yield stress for a metal changed from 650Nmm^-2 to 720Nmm^-2 when the average grain diameter decreases from 0.054mm to 0.037mm. I cannot figure this out, I've been trying...

Homework Statement A steel chimney is 28 m high, 1.4 m external diameter, and 20 mm thick. It is rigidly fixed at the base and is acted upon by a horizontal wind pressure of intensity 1.1 kN/m2 on the projected area. 2 The chimney weighs 74 kN per metre of height. Calculate the maximum stress...

Homework Statement Calculate the tensile stress in a rod 40 mm in diameter with a load 200 KN ? Homework Equations pi*r^2 The Attempt at a Solution 3.14 * (20*20) = 1256 mm^2 200 * 1000 = 200 000 N 200 000 / 1256 = 159.24 N/mm^2 Tensile stress = 159.24 N/mm^2...

Hi All, I have a stress strain curve, which have strain(in/in) on x-axis and stress in Y axis(Psi). Here I want to conver the curve to stress(MPa) and strain (mm/mm). I know that Psi can be converted by multiplying the digit by 0.00689475729. But in this case I need to change the strain...

I have been trying to find an answer for this for quite some time and found this forum which could help me. Does an initial stress (elastic strain induced in a metallic component) change its thermal expansion coefficient? if yes then what is the relationship? In simpler terms, does 2...