Read about stress | 97 Discussions | Page 3

  1. S

    Calculating Torque Limit on a hollow shaft type component

    I am designing a custom socket for an application at work and I am concerned about the wall thickness in the area marked by the red box (see attached drawing). The socket will be used to torque a nut to 500Nm. I have a degree in mechanical engineering and I can do stress calcs on straight...
  2. 1

    Metal prince rupert's drop?

    i am wondering would that be possible to make a prince rupert's drop with metal.. would it end up having similar properties? (ie high compressive stress => stronger) or does molten metal flow too quickly?
  3. G

    Pressure and Flow Rate in a Tank

    Homework Statement A tank of cross-sectional area A is initially filled with fluid of density ρ and viscosity μ to height hi. The pressure above the fluid in the tank is atmospheric, Patm. At the base of the tank there are two pipes, which are both open to teh atmosphere, such that fluid...
  4. G

    Force/Stress Along a Beam

    Homework Statement Two beams of different cross sectional areas are fused together to create a single beam, as shown in the figure above. The following relationships apply: A1 = 2A2, L2 = 2L1, E1 = 3E2. A tensile force F is applied at the ends of the bar, as shown. What is the ratio of the...
  5. J

    Increasing Cantilever Beam Stiffness

    Is it possible to create a cantilever beam with constant or increasing stiffness. I've been experimenting with several different shapes and profiles, and have not had any luck. I know that there are shapes with constant stress throughout, but I'm hoping to find a shape with constant or...
  6. A

    Stress due to compression of 3D object

    Good day, I am trying to calculate the stress along the yy-direction for a 3D object compressed in the zz direction (perpendicular to it). The width of the object (in the yy direction) is constant, and the object can only deform along the xx direction. All stresses except for sigma_zz (known)...
  7. O

    Dang Van multiaxial fatigue criterion

    Hello everyone, I am trying to find a difference between two versions of the Dang Van criterion on multiaxial fatigue. Let's say that Dang Van 1 is the one that uses a critical plane and Dang Van 2 the one that uses the Tresca criterion (which means no critical plane) I assume that the only...
  8. S

    Effects of External Pressure on a Cone

    In my study I deal with tubulars frequently, and it is well known how to calculate stresses due to external pressure on a (hollow) uniformly-thick cylinder (i.e. a pipe). Suppose now that I have a cone, tapering downward like a V, with a hollow cylindrical interior (like the inside of a pipe)...
  9. C

    Can the Plastic Moment be smaller than Elastic Moment?

    Homework Statement Stress = 320 MPa Max Elastic Moment = Stress*Z Max Plastic Moment = Stress*S Solve the maximum moments and compare the % increase Beam is an I beam with dimensions: (b and d) Top Flange = 25*10 web = 10*180 Bottom Flange = 200*8 Homework Equations see above The Attempt at...
  10. B

    What is the semantic error in my code

    Note that the code I am using is Python. Currently, I am attempting to numerically solve the equations of state that give rise to the Chandrasekar limit for a white dwarf star. My code works for a simple harmonic oscillator given the correct equations of motion, but does not compute the correct...
  11. F

    How to plot stress-strain curve?

    Can we plot stress-strain curve if we only have yield strength, tensile strength, and elongation data? For example if i have: Yield strength = 300 MPa Tensile Strength = 600 MPa Elongation = 50% How to plot the stress-strain curve? Thanks
  12. B

    High strain rate testing using the SHPB -- Help please

    I am a part C mechanical engineering student and require some advice for my individual project, which is based on the high strain-rate testing of a particular glass filled composite material using a split-Hopkinson pressure bar (SHPB) experiment. I gathered the results on a SHPB test rig and...
  13. M

    (Fluids) Difference in stress or pressure between setups?

    Hello, I'm a PhD student in medical biology and am doing experiments with bloodvessels. I've modified an existing technique and getting unexpected results (ofcourse..). I think it is due to a pressure difference but my knowledge of physics is inadequate to be sure. Ill give a short explanation...
  14. T

    Bending stress

    Hey everyone, I was just wondering if someone could explain to me what Bending stress is? Supposed you have a cantilever beam with a point load at the free end, I know that the bending stress will decrease as you move away from the fixed end? but why? and how can you back that up? Also, as...
  15. Q

    I have this real graphic from a tensile test

    Homework Statement How can I calculate the ultimate stress? (I refere to the stress that it's in the green rectangle). I have a real graphic, I have two deformations, (it was 2 test, from the same material) and only one stress. The orange curve is Stress versus unit deformation 1, and the gray...
  16. Q

    Is it well analyzed? Doubt about a bar: tension/compresion

    Homework Statement Calcular the force P when a bar starts yield, when 2 bars start yield, and when the 3 bars start yield Diameter = 25 mm (for every bar), Yield Stress of Steel = 250 MPa. Homework Equations The Attempt at a Solution [/B] [F][/AD] + [F][/BE] + [F][/CF] = P 2[Δ[/AD] -...
  17. T

    Tapered Cantilever beam

    Hey all, So I have this beam problem and I honestly am lost with it! The beam is I-section cantilever, tapers in depth along its length (See picture attached) with a point load at the free end. Im trying to figure out the deflection formula and how to derive it! Also, when calculating its...
  18. 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...
  19. A

    Medical physics: job stress?

    Hello, I'm currently in the middle of my graduate studies in medical physics (first year of Master's degree). The program has a reputation among past M.Sc. students of having a very demanding first year in terms of course content. While I'm having success in terms of GPA (3.8 last semester)...
  20. EternusVia

    Schools Working through college?

    Hi all, It's my third year of college studying mathematics. Some of the upper level courses are more challenging, although I'm making it through them. After school, I want to get a masters or PhD in mathematics. I currently work 10-15 hours a week, and sometimes this adds a lot of stress...
  21. 1

    The strain of a dog-bone specimen

    Homework Statement A dog-bone specimen made by aluminum alloy is used for tensile testing by a force of 4000N via two steel pins. The dimension of the specimen is shown in the following picture; the thickness of specimen and the length of pins are 4mm and 8mm, respectively. The mechanical...
  22. HeavyMetal

    Relationship between Stress-Energy Tensor and Interval

    Hello all, I have a homework question that I am almost 100% sure that I solved, so I do not believe that this post should go into the "Homework Questions" section. This thread does not have to do with the answer to that homework question anyways, but rather a curiosity about whether or not this...
  23. 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...
  24. T

    Factor of Safety - Mechanics of Materials

    Homework Statement Rigid beam ABC is supported as shown in the figure. The pin connections at B, C, and D are each double shear connections, and the ultimate shear strength of the pin material is 640 MPa. Tie rod (1) has a yield strength of 350 MPa. A uniformly distributed load of w = 11 kN/m...
  25. 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...
  26. Dennydont

    What is the maximum load the concrete can support?

    Homework Statement A certain type of concrete has a tensile breaking stress of 3.1 MN/m^2, a compressive breaking stress of 37.7 MN/m^2 and a shear breaking stress of 9.4 MN/m^2. A circular pillar of this concrete has a radius of 0.6 m. What is the maximum load it can support assuming that it...
  27. J

    Lame's Equation Maths Problem

    Homework Statement A steel pipe is 200mm internal diameter and 20mm thick. Calculate the safe internal pressure if the allowable stress is not to exceed 140Mpa. Homework Equations σr = A-B/r^2[/B] and σtheta = A+B/r^2 The Attempt at a Solution Right so, I've got two equations...
  28. Saumya Kar

    Von Mises stress Vs Principle stress

    Hello Folks, May be I am bring up the old topic again., but I've lost enough sleep over this topic. I understand that we use Von-Mises criteria for ductile material failure by comparing to yield limit and max principal stress is used to check failure for brittle materials. My question is bit...
  29. A

    Allowable stress in my project

    I'm doing a little project which came to a stop. I calculated expected material stress to be ~10 MPa. (bending) I know that my material (AlMgSi0,5) should carry well that stress, however I'm interested in max allowable stress for this material...
  30. H

    Measuring impact force on rubber spacers

    I need to find the impact force that can be absorbed by these spacers as shown in the image. The spacers are radially distributed over the shell, and they are supposed to dampen any external impact loads to reduce the effective stress inside the inner shell. Since the FEA model is not showing...
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