Shear Definition and 621 Threads

Shear stress, often denoted by τ (Greek: tau), is the component of stress coplanar with a material cross section. It arises from the shear force, the component of force vector parallel to the material cross section. Normal stress, on the other hand, arises from the force vector component perpendicular to the material cross section on which it acts.

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  1. R

    Minimum Bolt Diameter & Distance for Bolt Shear Force, 200kN

    the shear stress in each bolt is to be limited to 250mpa. i need to determine the minimum diameter of the bolts and the distance from the end edge of the centre plate to the centre of the bolt holes. All plates are 6mm thick and the punching shear stress for the centre plate is not to exceed...
  2. R

    Calculate Average Shear Stress in Glue Bond - 50kN, 80mm

    I need to determine the average shear stress developed in the glue bond. P=50kN and P2=80mm http://users.on.net/~rohanlal/Untitled99.jpg My attempt: stress=force/area stress=(50/(200*80))+((50/2)/(200*80))*2 Is this correct?
  3. C

    Resolved shear stress(rss) problem

    Can anyone tell me how to find the angle between tensile force and slip direction under these conditions:- 1. Tensile force is applied along [010] direction for a single crystal of iron(BCC). 2. rss is directed along (110) plane and in a [-111] direction when tensile stress of 52 MPa is...
  4. K

    Solving for Shear Stress Using Tau and Nu

    Homework Statement Tau = (some constant) * Nu Homework Equations Shear stress = (some constant) * Kinematic Viscosity The Attempt at a Solution n/a Thanks!
  5. B

    Shear Strength of an Erected Pipe

    Does anyone know how to determine what size/type of pipe/tubing would be necessary to withstand given wind speeds? Specifically, I'm wanting to build a "megatree", an outdoor Christmas tree made simply by stringing lights from the top to the bottom in a conical shape. I'd like a 20' + tree...
  6. S

    How do I plot Shear Force & Bending Moment diagrams?

    Hi sorry I am rather new to all this but I was woundering if I could get some help? Im currently studdying for my Uni's resits over the summer which fall in just a few weeks time. Iv started to go through some of the old past pappers and I've got stuck on the same bit over and over again...
  7. S

    Reference for shear modulus vs temperature of glass?

    Homework Statement I'm doing some preliminary research for a potential IB extended essay topic. It involves thermal stresses in fused glass; details aren't that important right now. But I need to find a table, equation, or SOME sort of reference that gives me the relationship between the...
  8. D

    Path of shear stress over one load cycle

    Homework Statement normal tension [MPa], shear tension [MPa], equivalent tension [MPa], deformation [%], number of cycles until failure all this are given for a lot of specimen of the same material Homework Equations \sigma_\theta, \tau_\theta The Attempt at a Solution Find...
  9. L

    Calculating Deflection and Shear Flow in Riveted Beams

    Homework Statement A beam loaded by a central point load deflects a quantity, e.g. d. If an identical beam is laid on top of the first beam and the same loading is applied the deflection drops to d/2. In this loading situation the ends of the beam are not aligned. When the beams are joined...
  10. A

    What Causes the Discrepancy in Calculating Wall Shear Stress in Pipe Flow?

    fully developed flow liquid of dynamic viscosity 2.9x10^-3 Pa.s and relative density 0.9 in horizontal pipe of diameter 12mm, length of pipe=200mm and mean velocity is 0.5m/s To find the wall shear stress, i used τ=μ.du/dy = (2.9x10^-3)(0.5/0.012) = 0.121Pa The answer is 0.968Pa, where am...
  11. F

    Calculate Torsional Shear Stress: Step-by-Step Guide

    I require some help please. I know : Rule: T/J = t/r = GΘ/L L = length = 0.33 r = radius = 0.025 D = diameter = 0.5 The starting points and stages would help. I have to hand this in next wednesday, i thought i would ask the community. ------ Determine the distribution of...
  12. P

    Calculating Shear Stress in Stainless Steel Rod - Quick Question

    Homework Statement Just a quick question: Wikipedia tells me that due the shearing stress, the yeild strength of Stainless Steel is 520Mpa But how can i find out the Yeild strength of a 100mm long rod with diameter 10mm. Is the info for wikipedia based on a 1mx1mx1m cube? or some...
  13. P

    Shear Stress of a particular length rod

    Just a quick question: Wikipedia tells me that due the shearing stress, the yeild strength of Stainless Steel is 520Mpa But how can i find out the Yeild strength of a 100mm long rod with diameter 10mm. Is the info for wikipedia based on a 1mx1mx1m cube? or some sort of SI unit. Cheers
  14. Saladsamurai

    Understanding Shear Flow Problems: Finding A' in q=QV/I Formula | Help Needed!

    PLEASE! Shear Flow HELP We are doing shear flow problems and my instructor has been unable to explain the topic in a general enough way to apply effectively to all problems. Our (my class) difficulty is understanding in the formula q=QV/I where the variable Q=yA' what to use for A'. It...
  15. J

    Using Petrov's equation to determine the shear drag torque in a motor

    An engine has 8 cylinders and crankshaft supported by 5 bearings of dimensions Journal diameter = 120mm, Axial length = 114mm, Radiall clearance =0.06mm and Oil density = 890.0kgm^-3. If the engine runs at 900rpm and is lubricated with oil whose kinematic viscosity is 180cSt at cold and...
  16. Saladsamurai

    Finding P Max with a Shear Diagram

    !Shear Diagram! Homework Statement I have posted the problem below. I am looking to find P max. My professor wants us to draw a shear diagram to find out where it will occur. From equilibrium equations I have found that Ay=By=P+0.6 kip I am having trouble drawing the diagram. I...
  17. L

    Calculate Max Shear & BM for 5m Beam w/ 20kN Point Load

    For a light 5m beam carrying a central point load of 20 kN, calculate: a) the maximum shear force (iv got that) b) " " bending moment im stuck on the bending moment, i can't remember how to work it out.
  18. S

    Finding Shear Centre of Lipped Channel

    Homework Statement The figure shows the cross-section of a lipped channel; http://img149.imageshack.us/img149/6324/88754244yh7.th.png I need to locate the shear centre based this. Homework Equations Second moment of area / inertia; Ixx = (1/12)bh^3 + Ay(bar)^2 First moment...
  19. T

    How Do Permissible Loads Relate to Bending and Shear Stresses?

    Homework Statement http://img150.imageshack.us/img150/756/17311663go9.jpg The Attempt at a Solution I wasn't 100% sure whether this should be here or in the Engineering section, hopefully I've got it right. Anyway, I'm fairly unfamiliar with this type of problem and basically I'm just...
  20. H

    Shear stress in an annular plate

    Hi Everyone, I am having a problem finding the shear stresses in an annular plate. The problem is as follows. I have an annular plate with outer radius a, inner radius b. Outer and inner edges are fixed. I also have an annular line load at radius r. I am trying to calculate the shear...
  21. G

    Shear Thickening Fluid Armour - Poject Idea

    Hi Im currently doing an HND in chemical engineering and everyone in my class has to do a project of their own choice. Iv been doing a bit of reading on shear thickening fluids and their application to kevlar to increase its strength against ballistics. The STF is made up of silica particles...
  22. Saladsamurai

    Finding diameter of pins from allowable shear stress

    So I got the diameter of the pin at a no problem. For some reason I am screwing up the Force at B. I thought my reasoning was correct, but I am coming up short. The answer is larger then what I an getting, so my F_BC must be too small, thus I am not accounting for something. Here is...
  23. N

    Allowable shear - indeterminate Torsion

    This is an indterminate torsional member. A hollow steel shaft ACB of outside diameter 50 mm and inside diameter 40 mm is held against rotation at ends A and B. Horizontal forces P are applied at the ends of a vertical arm that is welded to the shaft at point C. Determine the allowable value...
  24. K

    Calculating Average Shear Stress with Shear Force

    I need an equation for shear force ASAP I am finding average shear stress . i have the equation for that T=V/A T being average shear stress A being area and V being Shear force. Thanks
  25. Saladsamurai

    Shear and Bending Moment Diagrams

    Shear and Bending Moment Diagrams! Homework Statement Homework Equations Newton's 2nd and 3rdThe Attempt at a Solution So my main confusion is this: I found the reaction at A to be 19 kN If I make a vertical cut through some arbitrary point along the beam and and do some analysis I get...
  26. DaveC426913

    Can I find a photo of a landform created by tectonic shear in Canada?

    I'm looking for reference material. I need a good photo of a landform that is a direct result of tectonic shear. Canadian content strongly preferred - haven't been able to find any online.
  27. M

    Deriving Shear Stress on a Conical Bore Fluid Element

    I would like to derive a relation for shear stress on a conical bore shaped fluid element. Essentially, I have flow going through a converging nozzle. I know variables in this include length of the nozzle, inlet and outlet diameters and pressures and nozzle angle. I've done a force balance on...
  28. P

    Shear Modulus/Relative Displacement

    1.The problem is below...I put my work/solutions in the attached file. Using the estimate of 0.01 cm for the thickness of the wall of an aluminum coke can, the walls were compressed by 4 micrometers (using a 150 lb person). When the can is lightly poked (an approx. force of 1.0 N) with a...
  29. P

    Shear angle/relative displacement Have answer but not sure if it's correct. Help

    The problem is below...I put my work/solutions in the attached file. Using the estimate of 0.01 cm for the thickness of the wall of an aluminum coke can, the walls were compressed by 4 micrometers (using a 150 lb person). When the can is lightly poked (an approx. force of 1.0 N) with a...
  30. B

    Finding the max shear stress at a point on a plate (with a hole)

    i need to find max shear stress at a point on a plate (with a hole) under tension. i found using experimental data the principle strains at the point but i need to find the max shear stress using this data to compare it with a result found analytically. any suggestions?
  31. M

    Wood structures: story shear & unit shear question

    Homework Statement A rectangular two-story building with a wood roof and floor system and masonry walls is analyzed to determine seismic forces. Given: I=1, roof dead load D=15psf, floor load=25psf including partition load. Exterior wall dead load D=80 psf along both long and short walls...
  32. R

    Finding Shear Modulus for Θ = LT/JG Equation

    I have a question in an assignment and am using the Θ = LT/JG equation to find the angle of twist in an I section beam to be used in a monorail. I have all other figures to put in the equation but am not sure where i get G value from Help :o) Thank you
  33. M

    Shear Forces and Bending Moments in Beams

    Homework Statement (Q) A beam 4m long is supported at the left hand side by a hinge support and on the right by a roller support. It is under a non-uniform load intensity throughout by a load intensity given by: w = 25Cos(pi x/8)kN/m. Write equations for the shear force and the bending...
  34. S

    Shear stress, what is a flat tie bar ?

    shear stress, what is a flat tie bar...? Homework Statement two lengths of flat tie bar are connected together by a lap riveted joint with three rivets each 10mm in diameter. Calculate the maximum pull that can be applied to the tie-bars if the shear stress in the rivets is not to exceed...
  35. S

    Shear force bending moments diagram help?

    Homework Statement It's number 4 I'm doing Homework Equations ΣmomentA= 0 ΣFx= 0 ΣFy= 0 The Attempt at a Solution i've got the correct answers i think, but I'm not sure how to draw the shear force and bending moment diagrams because of the moment that's included. i did draw...
  36. S

    Solve Shear Stress with Expert Tips

    attached is my problem. any help will be appreciated! thanks!
  37. S

    Morh's Cicle with two shear forces

    Homework Statement click on link for picture of problem http://i21.photobucket.com/albums/b300/DrGame/morhs.jpg The Attempt at a Solution Well I'm just really confused because you have two torques, and you can't draw morh's circle that way.. I've tried about 3 hours of various things...
  38. B

    Working out wind shear in dams & retaining walls

    Hey, got a bit of a problem; got a few questions on wind Shear in Dams & retaining walls. Can anyody help http://img296.imageshack.us/img296/9366/image0003xb2.jpg Thanks Andy.
  39. I

    Calculating Shear Stress for Thread in Hydraulic Press

    Shear thread formula? my group has been told to figure the shear stress of a thread for a hydraulic press which pushes at 100t, we have figured it will pull at 30t using the ratio of the areas from the pistions. just we need to figure the shear stress on the thread if it was to pull. we don't...
  40. E

    Shear cell testing, want to understand it completely

    Hello, I am working on a project where I will have to do some shear cell testing, I have some basic under standing (very basic). and I have done some research on the internet. I have a shear cell tester. it is very basic, geared motor with a rod to push on sample , which is under a weight. I...
  41. G

    What is Shear Flow? Does it Impact Viscosity?

    What is shear flow? Hat this flow viscosity? .... Thank you
  42. C

    Torque and Shear stress this time

    I'm :confused: I'm OK at electrical theory but mechanical just doesn't compute. I have the following question if anyone can help. Determine the external diameter of a tube needed to transmit a torque of 30KNm if it has an external diameter twice that of its internal diameter. The sheer...
  43. S

    Shear Moment Diagram: Find & Fix 0.06 kip*ft Error

    Homework Statement Find the shear and moment diagram. Homework Equations dV/dt = -w(x) dM/dt = V(x) The Attempt at a Solution See attached. My problem is that I'm getting 0.06 kip*ft at the end of the beam, and I don't think that's right.
  44. I

    Shear Stress due to Laminar flow

    Homework Statement Oil of Density 888kg/m^3 and viscosity 0.8Pa*s is flowing in a horizontal pipe of diameter 0.15m. The local flow velocity at the centerline is 10m/s. find the shear stress exerted by the oil on the wall of the pipe. Homework Equations tau = -eta*(dv/dy) The...
  45. P

    Pure Shear Questionthanks for your help

    Homework Statement Hey everyone. I was practicing some problems, and I came across one that seems pretty simple, yet I am having difficulty proving the answer. The question asks us to show that a state of pure shear causes no volume change in linear elastic deformation. I have a very good...
  46. V

    Lehmann discontinuity and shear wave anisotropy

    What do geophysicists mean by depth variation in the shear wave anisotropy of the Lehman discontinuity? And why is there none under the oceans but some under the continents?
  47. S

    Determining Shear Stress on Bolts

    So as you can see, the drawing I've attached shows two bolts through those 3 plates. There are the shown forces acting on the plates, and the maximum allowed shear stress is given to be 110 MPa. You're supposed to determine the minimum diameter required for the bolts. Also, the forces are...
  48. S

    Shear force diagrams simple stuff hey?

    shear force diagrams simple stuff hey!? hey guys this is probably very straight forward stuff for u but i have an example question on a loaded beam. there is a UDL, 2 pure couples and 2 fixed points. now how do i do the shear force and bendin moment diagram for this really lookin forward...
  49. P

    How Does Shear Modulus Affect the Distance Traveled by a Rubber Sole?

    A child slides across a floor in a pair of rubber-soled shoes. The friction force acting on each foot is 25 N, the cross-sectional area of each foot is 20 cm2, and the height of the soles is 5.0 mm. Find the horizontal distance traveled by the sheared face of the sole. The shear modulus of the...
  50. M

    How Is the Shear Modulus of a Sponge Calculated?

    A large sponge has forces of magnitude 17 N applied in opposite directions to two opposite faces of area 43 cm2 (see the figure below ). The thickness of the sponge (L is ")3 cm. The deformation angle (g is ")8.4°. (a) What is delta x? (b) What is the shear modulus of the sponge? delta x =...
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