What is Shear: Definition and 621 Discussions

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. S

    How do two light beams combine at a shear angle?

    How do two light beams combine at a shear angle? Two electromagnetic beams cross at a shear angle. They have equal phase, intensity and polarization. The angle is shear enough, so that in region in which they intersect, there is less than a quarter wave difference in phase over the...
  2. ltkach2015

    Resolved Shear Stress VS General Shear Stress -Contradiction?

    TERMS: Slip Plane: is the plane that has the densest atomic packing—that is, has the greatest planar density. Slip Direction: corresponds to the direction in this plane that is most closely packed with atoms—that is, has the highest linear density. NOMENCLATURE: θ = angle of the slip plane as...
  3. ltkach2015

    Resolved Shear Stress Compared w/ Shear Stress-Contradictioni

    TERMS: Slip Plane: is the plane that has the densest atomic packing—that is, has the greatest planar density. Slip Direction: corresponds to the direction in this plane that is most closely packed with atoms—that is, has the highest linear density. TEXTBOOK: Materials Science and Engineering...
  4. DrVirz

    Shear stress in bending member question

    Hi all, I was just wondering if someone could confirm that my answer to the below question is correct. The point where the question asks you to find the shear stress is at 2m (n). However, I don't believe this value needs to be included in the calculation anywhere?
  5. H

    Average shear rate of of particle sureface

    Homework Statement Diffusion coefficient (D) of 100 nm particles ( density = 1050 kg/m3) in a viscous solvent at 25 C is 2.2 x 10-13 m3/s What is the average shear rate at the particle surface? Homework Equations D = kT/ 6πηa (1) where k is Boltzman constant, T = temperature, ηsusp =...
  6. S

    Multiple distributed loads on a beam

    Hi all, my professor has hinted at proposing a question of this sort to us for a shear and bending moment diagram. Now while I am comfortable with having [either] a uniformly distributed load or a varying one, I'm not sure how to deal with both. I can't seem to find anything in my textbook to...
  7. W

    How do I find the critical value of shear stress?

    Homework Statement Finding the critical value of shear stress at the junction and at the neutral axis Homework Equations stress max = (Bending moment x height from neutral axis)/Moment of inertia Shear stress = Shear force/area The Attempt at a Solution I am able to do the first 2 parts but...
  8. B

    Double shear pin for the snow blower

    Snow blower Stanley SS30 Type :Dual Stage Maximum RPM: 3600 Torque : 21.56 Nm Impeller Diameter :16" inch Auger Diameter:16" inch CC: 302 Tire Size : 16" * 6.5 I do not know the gear ratio : if assume its 12:1 Gear output torque will be 258.72 Nm Homework Equations Assume the Shaft diameter =...
  9. S

    Shear Stress due to bending

    Dear Colleagues, This problem causes me a headache - any suggestions? I have a truncated cone under bending on two axes. I take a section where I have two acting side forces - Qx & Qy I want to find shear stresses acting in the point A which is on a circumstance of the section 45° between axes...
  10. T

    Converting stress-strain curve to shear stress-shear strain

    Homework Statement For a crystalline metal material - Elastic modulus E - Poisson ratio v - A table with test data of stresses vs. total strains, from a monotonic uniaxial tension test, which generates a stress-strain curve. How would you use this data to find the corresponding pure shear...
  11. A

    Shear, bending, and stress in a beam; Please explain

    Homework Statement Homework EquationsThe Attempt at a Solution I can't understand the solution and what is the variable "X" !
  12. S

    Finding the shear stress and angle of twist in hollow shaft

    MODERATOR NOTE: THIS THREAD WAS ORIGINALLY IN ANOTHER FORUM, SO THERE IS NO TEMPLATE. I have a hollow shaft made of a titanium alloy, Shear Modulus "G". The shaft has a wall thickness of 3.2mm and an inner diameter of 20mm. The shaft looks as show in the attached image. A torque T of 232 Nmm...
  13. A

    Double Shear stress on a bolt

    Hello. I know what follows seems like a HW problem, but it's an actual problem I'm trying to solve with some equipment I will be using. I am concerned that a bolt I am using will be unable to withstand the forces that it will face, and so I am trying to solve the problem out mathematically as...
  14. N

    Bending moment and shear force for screw

    Can someone help me with determining the free body force diagram, and hopefully I can go on from there. Homework Equations M = F.dI found T = 500N The answers are shear force = -62.5N , Moment = 64.4 Nm , Tension = 500N
  15. throneoo

    Laminar Flow : shear force on walls

    Homework Statement a viscous fluid with viscosity η flows through a circular vessel of length L and radius R under a pressure difference of P. Assuming the flow is laminar, calculate: a)the force on the walls of the vessel. b)the net force on the vessel. Homework Equations Hagen-Poiseuille...
  16. S

    Calculating shear stress in a beam?

    The equation for shear stress as I know it is VQ/It where V is the shear force, Q is the first moment of area(?), I is moment of inertia and t is the length of the section in question. My question is, is there a general formula for Q? In my Solid Mechanics notes I've written that Q = ∫y.dA but...
  17. R

    Shear in fluids: What is measured and called - strain?

    It's about shear stress and strain. We are talking about Newtonian fluids, a situation where we are lubricating a rotating shaft with oil. I cannot understand what we are measuring that we use as the strain. SOLIDS. As far as I know we can say: Stress (F/A) = G x (Δ l / l) Where G is shear...
  18. M

    FEM, FEA, Frame, Moment, Shear, find Stiffness Matrixx

    Homework Statement Hi, I need some help analysing this frame. First of all i bellive its hard, if not impossible, to get as detailed results by hand calculations as my softwear CSI Sap2000. Becourse of shear and axial deformation. Is it possible to obtain the stiffness matrix of this frame at...
  19. G

    Shear Modulus, Modulus of rigidity

    Hello lol first post . so I've done an experiment in determining the modulus of rigidity for a bar of an unknown material (torsion experiment). I have been asked to analyse the results, which I still have no idea what that means and find the material with the G value that i have. I've been...
  20. P

    Maximum shear stress on a given plane?

    I want to know the maximum shear stress acting on the y-z face(plane). I already know all 6 stress components: Sxx, Syy, Szz, Sxy, Syz, Sxz. The shear components on the y-z face are Sxy and Sxz, which are orthogonal to each other. Is the maximum shear on this plane simply the greater of the two...
  21. F

    Shear viscosity and Capillary Rheometer

    Hello Forum, I have some conceptual doubts about shear viscosity and would like some help if possible. In general, viscosity depends both on temperature and on shear forces (more strongly on shear forces). "Shear viscosity" is the viscosity that a molten plastic assumes when the molten fluid...
  22. G

    Direction of max shear strain

    Homework Statement Hi Everyone, I am going to be doing an experiment soon using strain gauges on a beam and I will have to, among other things, calculate the direction of the maximum shear strain with respect to the axis of the beam. I am trying to find the correct equation to use. Homework...
  23. M

    What is the Shear Stress in Bolts for a Given Torque and Separation Distance?

    Homework Statement jan 2012 q3.jpg I've solved everything up to part d). I generally struggle with questions on bolts and I'm really not sure how to tackle this problem. Homework Equations τ = Tr/J, τ = 200MPa, T=1kNm The Attempt at a Solution I worked out the separation of the bolts (I...
  24. W

    Can shear be ignored in a situation like this

    The situation I am looking at involves a round beam that goes through two rigid round holes (top beam in the image). The holes are meant to fix the beam. The beam length is between 1m and 2m and the diameter is less than 2 cm. If the beam was attached at the end with only one holes fixing it I...
  25. S

    Shear Force/Bending Moments Equation

    Hi, question and solution attached. I'm having trouble converting the second equation in 2 (b) to the corresponding bending moment equation. I have worked out everything else, I'm just unsure how the '-1562.5N' part is calculated. http://snag.gy/Uqrel.jpg Help is much appreciated, thanks!
  26. S

    Shear Force: Help with Question 2(b) - Mentor Note

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi, I'm having problems with the shear force question attached. I've attached the solution as well. I'm looking at 2. (b), I have the 0 > x > 3 bit, but I'm struggling with the 3 > x > 4...
  27. G

    Torque for drill to shear through material

    I'm attempting to figure out the torque required for a twist drill bit to shear through a material. I have no idea if this is even remotely correct but this is the process I used. Ultimate shear strength = Force/Area Therefore Force = USS x Area The USS of the material = 360 N/mm^2 I...
  28. P

    Shear stress in thin wall beams

    Homework Statement http://postimg.org/image/9va37id55/ The question is to find the shear stress at the points A, B and C. The solution uses the sectioning planes aa, bb and cc to do so. For example, at C, how should I know whether to use a horizontal or vertical sectioning plane. Also, how...
  29. T

    How to find the torque, power and shear stress in this case

    Here is the sketch of the tv mount. http://1drv.ms/1G4yW6W The known values to me are the diameter of the rod (6mm), the length of the rod (600mm), the mass of the TV= 8.7kg and that the tv is supposed to move 600mm in 5 secs. Is there any information that I am missing in order to calculate the...
  30. G

    Tensile Stress and shear stress

    Suppose, a mild steel bar is being pulled from both ends.The stress acting on it will be tensile in nature.There is no compressive stress on material in this situation.When the pull exceeds material's yield strength,plastic deformation and strain hardening will occur.If pulling force is...
  31. O

    Bulk and Shear Modulus Calculations

    Homework Statement A material which has a Young’s modulus of elasticity of 250 GN m–2 and a poisons ratio of 0.32, calculate: (a) the bulk modulus of the material (b) the shear modulus of the material. Homework Equations E=3(1−2ν)K 3. The Attempt at a Solution a) E = 3(1−2ν)K K = E /...
  32. M

    Shear stress on beam loading

    1. Determine average shear stress. Question attached2. Shear Stress = F/A , Sum of Forces and Moments = 0, Trig3. Attempt attached. Having a hard time determining reaction at pins. I worked out that the opposite side is 4.5m. I assume the next step is to determine reaction then apply Shear...
  33. M

    Shear Force and Bending Moment

    Hi everyone here is the question I'm having trouble with. included is my attempt and the question. 1. The Reactions at A (Assuming the boom weight is negligible) 2. The shear force and bending moment along the boom length and indicate the point of maximum bending moment. 3. The maimum bending...
  34. K

    Calculating maximum shear in a steel beam cantilever

    Problem: I do not know how to approach this problem. For a beam which has two reactions, the shear stress is equivalent to the reaction. I suppose that the stress is calculated using moment some how. But how? For seeing if the beam is allowable stress design compliant, you can use the...
  35. T

    Shear stress calculation question

    Homework Statement I've been working on this question for a while but can't get anywhere. I was able to calculate Force BD and Force CE Now I am not sure how they calculated the area of section BD the math isn't making much sense to me Homework Equations σ = P / A A= π r2 The Attempt at a...
  36. T

    Calculating Force for Punching a Hole in a Plate

    Homework Statement What force is required to punch a 20-mm-diameter hole in a plate that is 25 mm thick? The shear strength is 350 MN/m2. Homework Equations σ = V / A The Attempt at a Solution The first thing I did was rearrange the formula to isolate for V. I got the area which (A=πr2) gave...
  37. K

    Question related to Bending Stress and Shear Stress of a I shape beam

    1. Homework Statement The beam ABCD with the cross section has pin connections at B and C and is subjected to a uniformly distributed load w. If the allowable bending stress is 150MPa and the allowable shear stress is 80 Mpa. ( Hint : the horizontal reaction forces at A and D are both zero)...
  38. R

    Can I Calculate Shear Force and Bending Moment for Partially Loaded Beams?

    Hi, I am designing a beam to replace a load bearing wall. I have produced 2 separate UDL diagrams which, one for floor load and one for wall load. I am trying to find shear force and bending moment as in one for the total of the two diagrams. I know how to do it if the loads are spread...
  39. Feodalherren

    ME statics - Shear Forces and moments inside beam

    Homework Statement W= 3kip/ft. Find the shear force and moment at C. Homework EquationsThe Attempt at a Solution Skipping some initial steps, I found the reactions to be Ax=0 and Ay=9 These are known to be correct. Now, slicing the beam from a to c. I get Ay=9. Now I take 3(1/2)6= 9 from...
  40. D

    Applied shear stress between plates

    Hi :), I need to calculate the shear stress applied between 2 plates and I don't remember how to take the thickness of the plates into account, --So basically I will be grateful if somebody could write the equillibrium for shearing stress between 2 plates (1 plate is applying force on the other...
  41. M

    Shear Force Diagrams: Uses, Benefits & Calculations

    Hi there, I have created lots of shear force and bending moment diagrams for simply supported beams. I have used the maximum value on the bending mement diagram for bending and stress equations, but I have never found any real use for the shear force diagram. Yes they tell you the distribution...
  42. F

    Solving Shear Stress on a Bar - Mechanics of Materials

    I'm trying to understand a problem found on Mechanics of Materials and did not completely understood the problem. I can solve problems like this but I still don't know why I'm solving this way. It is a simple question: Why the shearing force V does not cause shear stress (\tau_2) on the point A...
  43. E

    Shear stress on a tire from a puddle of water

    Homework Statement A car is moving at 65 mph and hits a puddle of water 1 inch deep. What is the shear stress on the tire from the puddle of water if the radius of the tire is 16 inches. r = 16 inches u = 65 mph y = 1 inch mu = viscosity = 2.344*10^-5 lbf*s/ft^2 Homework Equations angular...
  44. B

    Minimum Shear Stress in Hollow Circular Tube

    Homework Statement A hollow pipe has an inner diameter of 80 mm and an outer diameter of 100 mm. If its end is tightened using a torque wrench using 80 N forces, determine the maximum and minimum shear stress in the material. Where are they located? Note: In the diagram of the picture, the...
  45. E

    Total moment of shear stress about the center line of a cylinder

    http://postimg.org/image/onxjqc26l/ I have found the shear stress of the inner cylinder to be 405 Pa like in the solution but I am having trouble visualizing the total moment of this stress about the center line. I was wondering if someone could explain where that d(theta) in the moment...
  46. W

    How to understand shear stress

    This is not a textbook problem, instead it is how to understand a common diagram. The diagram occurs in the wiki entry for shear stress http://en.wikipedia.org/wiki/Shear_stress It shows a 2D square, anchored on the bottom side, and with positive (rightward) shear stress applied to the...
  47. I

    Calculating Bending & Shear Moment: Homework Statement

    Homework Statement (a) Calculate the maximum bending moment (b) Calculate the maximum stress in the beam (c) At the point of maximum stress sketch a graph of the stress distribution through the thickness of the beam, indicating which are tensile and compressive stresses. (d) Determine the...
  48. Ganesh Ujwal

    How to find max shear stress at a given point?

    The state of plane-stress at a point is given by σx = -200 MPa, σy = 100 MPa, σxy = 100 MPa The Maximum shear stress (in MPa) is: A) 111.8 B) 150.1 C) 180.3 D) 223.6 Explain Procedure also with Answer. Attempt: i already used Max Shear Stress τ = QV/ib, then also answer is not matching...
  49. E

    Shear deformation higher order plate theroies - variational consistent

    What is the meaning of... 1. Governing differential equations obtained are consistent with the assumed displacement field (If for a particular theory, governing differential equations are derived using variational approach). 2. Obtained boundary conditions are consistent with the governing...
  50. T

    Shear Thickening Fluid (in plastic)

    I have been looking into shear thickening fluids and how they are used with Kevlar for bullet proof vests. I am considering alternative uses but have limited knowledge on the subject. I would like to create a rigid solid that becomes harder and less flexible when a large force is suddenly...
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