Shear Definition and 575 Threads

I was looking at bolts strengths on this chart (bottom of page) http://www.derose.net/steve/resources/engtables/bolts.html#largebolts and saw that for a 1/4 unf the bolt shear was around 370 but the chart below it listed it at 2700. Why is that?

i am taking a geomechanics course, as a part of the course we are required to do labs, one of which is to test the shearing stress of a sand using the direct shear method. we repeated the experiment 3 times changing the compressive stress each time, 0.75, 1 and 2 kg/cm2 from each...

I passed my statics course and am currently taking material stength course. The thing that has been on my head is the fact that, although I know how to do shear and bending moment diagrams... I do not know how to READ them. In other words, the diagrams don't mean anything to me. For...

Homework Statement Hi, I know how to draw simple Shear Force Diagrams, but I am struggling with the example in the below picture, as it has a UDL. Homework Equations The Attempt at a Solution Normally for the solution, I should start the diagram at 26.7, then across and down...

Homework Statement Determine shear force at point D of Beam http://tinypic.com/r/339m5b6/7 Homework Equations Sign conventions for cut at d when considering LHSFBD M = xFy - yFx - cross product... The Attempt at a Solution I've found the reaction forces by finding the sum of moments...

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...

1. Homework Statement A tensile load of 40KN is applied on a double shear joint. Design a bolt that holds the members safely without any kind of failure. A UTS 1250 class steel [allowable stress = 1080 MPa, Ultimate strength = 1250 MPa] bolt is used and the members (lugs) are made of AA2014...

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...

I need to find the shear center of the following cross section, but to do so i need to be able to draw the shear flow. Does anyone know how you would draw it for this case and why? It seems to be pretty easy until you get a complex cross section like this. See cross section here...

Homework Statement A student bumps into a tray of jello. The lime jello is jiggling side to side faster than the orange jello. Both jellos have the same spatial dimensions. Which statement is true? Answer: Lime jello has a higher shear modulus than orange jello Homework Equations...

Resolving Forces - Shear and Bending Moment - :) Homework Statement The data table and associated questions are rather complex, if you have the time it would be much appreciated if you could have a look at the attachment and provide me with a solution or point me in the right, i just can't...

I have the solution's manual for this particular problem, but I'm having hard time understanding the steps they've taken. I've attached pictures of the problem below. For the shear, are they using 1/2*x*(wx/L) because it is equal to the area of the force? And for the bending moment, where are...

Hey!, I was repeating for myself a course I had from a earlier year, fluid mechanics. I looked at the derivation of the navier stokes equations, and there is one term that does not give meaning to me. Take a look at the x-momentum equation here...

Homework Statement I have an assignment that is similar to the following question. I believe if i am able to do this question i will be able to do the assignment. However I cannot seem to be able to get this question right. Below the question and answer...

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...

I can't seem to wrap my head around the signs of shears and moments when applied to beams. Consider a cantilever beam that goes from x = 0 to x = L (with positive deflection, or y(x), corresponding to a deflection upwards). The standard equations tell us that \text{Moment} = EI...

Homework Statement Calculate the diameter of a meduim carbon steel pin in double shear subjected to a suddenly applied shearing force of 150000N? Homework Equations A=p/t p=300000 ( double shear) t=580 ( ultime shear strength) The Attempt at a Solution Double shear 150000...

Homework Statement The correct answer is circled. [PLAIN]http://img80.imageshack.us/img80/976/94926993.jpg The attempt at a solution I used the equation q = \frac{VQ}{I} But for Q = Ay, what is the area? My area was 80 x 20 = 1600 mm^2. However, this gave me the wrong answer.

Well I know I need to plot Mohr's circle for this, but what are the things i need to do before reaching that stage.here is the question: A 250mm diameter pulley is mounted on a 50mm diameter shaft at a distance of 200mm from a ball bearing. If the belt tension ratio is 3 to 1 determine the...

Homework Statement A cantilever beam (length, L, height, 2h, thickness 1). The top surface is subjected to shear stress tsubxy = s. Determine the stress function psi. The boundary conditions at the end of the free end (x=L) can be satisfied by integration (e.g., traction free can be...

If a body spins fast enough does the outer portion experience time at a different rate than the inner and if so what effects might this have?

Homework Statement Find the maximum shear stress for \sigma _{xx} = 120 MN/m^2, \sigma _{yy} = 50 MN/m^2, \tau _{xy} = 40 MN/m^2Homework Equations \sigma _{min} = 0.5(\sigma _{xx}+\sigma _{yy})-0.5((\sigma _{xx}-\sigma _{yy})^2+4\tau _{xy} ^2 )^{0.5} = 31.8 \sigma _{max} = 0.5(\sigma...

Homework Statement A rod of length L is attached to a wall. The load on the rod increases linearly (as shown by the arrows in the figure) from zero at the left end to W Newtons per unit length at the right end. (a) Find the shear force at the right end. (Use any variable or symbol...

Homework Statement the distributed load the N V and Moment on the incline plan angle 30 solve by integral method need solving this problem as example Homework Equations The Attempt at a Solution

Hi all - first post at PF. As a 'science enthusiast' with no training in the tensor math of GR, was initially bewildered by the common assertion that still hypothetical 'dark energy' would act as a source of 'negative gravity' despite having positive energy density. Finally grasped that pressure...

Homework Statement http://img80.imageshack.us/img80/4476/bendingshearquestion.jpg Homework Equations \sumM = 0: \sumFy = 0:The Attempt at a Solution Revising for my finals and going over questions, and would like to understand more clearly how to get the following. Solution is in the image...

I have just reg'd here and I have been lurking forever but its time to give in so I can get some help. Ive been working through some examples in this book; and so far so good however I am on a question which does not make sense the way I am working it out seems to me to be correct however...

1. Problem Statement The long bolt passes through the 30-mm-thick plate. If the force in the bolt shank is 8kN, determine the average normal stress in the shank, the average shear stress along the cylindrical area of the plate defined by the section lines a-a, and the average shear stress in the...

Something has been bugging me for a long time, since I took my first statics class a few years ago. I have a problem with a common figure found in many statics books. I have attached the figure to my post. My question deals with the delta V added to the shear force on the right side of the...

There is a discussion of expansion, shear, and vorticity in Wald (p. 217) and in Hawking and Ellis (p. 82). My motivation for comparing them was that although Wald's treatment is more concise, Wald doesn't define the expansion tensor, only the volume expansion. Wald starts off by restricting to...

Hello All, I have a quick question for you. I have small sample of a cement-like-like-material and I am high shear mixing it using a power drill and a impeller blade. The material is placed a beaker and the impeller blade shears the cement of the bottom of the beaker. I would like to...

I started a new job two weeks ago and I've been out of school for twenty years and have not used strength of materials knowlegde since. I had a part fail in the lab and I would like to calculate the force that would have been necessary to cause the shear failure. I have simplified the problem...

Dear colleagues I`m working on liquefaction resistance of sand utilizing shaking table tests. i want to draw shear stress-strain curves for each test and i need help from you,my Physicist colleagues. my model container is 200*70*50cm and i`ve put acceleration transducers at depth 7,21 and 35cm...

I apologize for not using the template, but my question is more of a conceptual question than anything else. The only thing so far that confuses me with Shear and Bending Moment Diagrams is when, in some cases, it is easier to approach the beam from the right side instead of the left...

Homework Statement The ski supports the 900N weight of a person. If the snow loading on its bottom surface is trapezoidal determine the intensity w (N/m). Draw the shear and bending moment diagrams for the ski. The ski has an overall length of 2m. The force arrows 'hang' of the bottom of...

Homework Statement We've been given several questions and told to use the internet to find out the formulas for them. But I can not find the right ones anywhere! If anyone could just give the formulas that's all I need! A seat is attached by a simple pin of a circular cross section...

Hello I am trying to understand if is it reasonable to use "slip walls" or "zero shear stress" to model smooth walls. I am working with turbulent air flows in ducts. Please share your comments.

Is simple shear same as rotational strain? or, is it a type of rotational strain?

for the following cross section the ratio Eb/Ep=30 find the shear centre of the cross section ------------------------------------------- first of all i need to find the equivalent cross section, which will be the same except that the horizontal parts will be of length n*L=30*1=30cm...

the open cross section shown is thin walled with a constant thickness. find the location of the shear center i have solved this sort of question but never for a circular cross section, at first i thought it should be the same just using polar coordinates instead of Cartesian coordinates...

What is the definition of shear stress in a cylindrical tube? It seems like sometimes that is written \tau = \mu \frac {\partial u} {\partial r} but then at some magic moment it gets rewritten as \tau = - \mu \frac {\partial u} {\partial r} so as to arrive at formula like \tau = -...

Homework Statement Determine the Max, Min & average shear stress, and the shear force in web V = 125kN Note th attachment Homework Equations The Attempt at a Solution First I calculated the Moment of Inertia I = (1/12)(bh3 - bh13 + th13) = 3.43X10-4 m4 Max Shear...

Homework Statement Draw the shear and moment diagrams for the beam shown and find the bending moment M at section C. The Attempt at a Solution So I got the correct answer for Mc but I'm confused on a few things. I get different answers using different techniques for different aspects of...

I have this flow with Reynold's number in the 10^5, which I think it's big enough to treat the fluid as inviscid, does this also mean I can assume the shear stress is negligible?

Homework Statement I have encountered this problem several times in class, but have never really understood it. There is a solid round bar that is fixed on one end, and that bends 90 degrees a ways down. At the free end of the bar there are forces applied in each Cartesian direction. Like...

what is shear? from looking at books etc i understood that the shear of a direction was the change of angle. but then pure shear doesn't have a change in angle between the axes, its just stretched in one direction and contracted in the other. so why is this called pure shear? I am rather...

[FONT="Arial"][SIZE="4"][SIZE="5"] Are there any figures available for shear stress of annealed and toughened glass?

I was wondering if anyone could please point me in the direction of some background info on who (and why) someone defined the equations definition of the shear modulus, I've searched in google and wiki and havnt found anything useful. Just a link or something would be great