Stress and strain Definition and 77 Threads

In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing). These curves reveal many of the properties of a material, such as the Young's modulus, the yield strength and the ultimate tensile strength.

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  1. Saladsamurai

    Short Beam Bending: Roark's Formulas For Stress and Strain

    Is anyone familiar with the Roark's text that can clarify some terms for me? I am trying to clarify what Roark is referring to in the above mentioned text in the section on short beams (in the 5th edition 7.10 and in the 7th edition 8.10). Throughout the text, he uses the terms "span" and...
  2. P

    Stress and Strain problems help

    Does anyone help me to solve this problem in the attached file? When I solved this problem, I got wrong answers. Attached file is the image file with the problem and answer. (Question No.3) I think I have to find allowable shear stress of Pin A to find the safety factor of this pin...
  3. F

    Compound Bar Stress and Strain Analysis

    Question The compound bar is composed of Aluminium surrounded by High Density Polyethylene Al= E = 69x10^9 Pa Al= r = 0.035 m HDPE= E = 0.8x10^9 Pa HDPE= r = 0.055 m The compound bar has a load of 75000N applied evenly to each of its ends. Part 1. Find the change in...
  4. W

    Stress and strain, maximum applied force before permanent deformation/breakage

    Compute the maximum longitudinal force that may be supported by a bone before breaking, given that the compressive stress at which bone breaks is 2.00e8 N/m^2. Treat the bone as a solid cylinder of radius 1.55 cm. The attempt at a solution I tried using the equation Max Torque = pi/4 * (r^3) *...
  5. D

    Stress and Strain (Finding the thickness of truss members)

    Hi guys i have a exam coming up soon and stress is starting to kick in. I am good with stress and strain, but I am just confused on this question and don't understand what i need to be doing. I've tried every formula and i just can't seem to get question 5 out. The answears for this question is...
  6. N

    Stress and Strain Factor of Safety

    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...
  7. H

    Question about stress and strain

    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...
  8. J

    Calculating Compression of Bored Out Steel Column - Stress & Strain

    I have been given a question to recap by my tutor as i find this topic fairly difficult. A steel column is 90cm long and 150mm diameter. If a hole 100mm diameter and 60cm long is bored out, calculate the total compression of the column when carrying a load of 1MN. Take the modulus of...
  9. M

    Stress and Strain fracture and flow

    Stress and Strain...fracture and flow If a material has a maximum tensile fracture stress of S, and a maximum shear stress of T which causes plastic flow, how will it deform: If T=S and if 3T=S ?? Its not an important question, but I am just curious? I can't get my head...
  10. G

    Stress & Strain: Exploring Copper Wire Properties

    http://www.ami.ac.uk/courses/topics/0123_mpm/images/met_mpm_imgb.gif http://i859.photobucket.com/albums/ab152/Greener1011/Untitledpicture.png First off I am sorry about the massive size. The top graph is how a stress strain graph of a metal should look. However i can't seem to think why Mpa...
  11. M

    How Do I Correctly Calculate and Plot Stress-Strain for a Physics Test?

    I need to draw a stress and strain graph. New to physics, so would like to know if i am on the right line and require a bit of help for the last few questions These are the values I have: Diameter - 10.02mm Original Length - 50mm Extension -10mm Diameter After Test - 6.76mm Max Load -...
  12. T

    Principal Stress and Strain on a Fracture

    Homework Statement Find the expressions for principal stresses in both plane strain and plane stress conditions sigma(x) = (K/(sqrt(2*pi*r)))*cos(theta/2)*(1-sin(theta/2)*sin(3*theta/2)) sigma(y) = (K/(sqrt(2*pi*r)))*cos(theta/2)*(1+sin(theta/2)*sin(3*theta/2)) T(xy) =...
  13. T

    What are the Stress and Strain in each rod?

    Homework Statement A copper rod of 2 meters is joined to a steel rod with length (ls) and with cross sectional area of 1.0cm2 and 2.0cm2 respectively the compound rod is subjected to an equal and opposite force of 3x104N. Find: a) The length of the steel rod if the elongation of the steel...
  14. S

    Stress and Strain/ Hooke's Law Question

    Homework Statement A 50 kg traffic light is suspended above an intersection by a continuous steel cable. The cable has a diameter of 1.0 cm, and the light is depressed 12 degrees below the horizontal. What is the percentage increase in the length of the cable due to the mass of the traffic...
  15. D

    Stress and strain. young modulus

    in the following question, how do i find the changle in AB, the change in AD and the change in AC? http://lh4.ggpht.com/_H4Iz7SmBrbk/Sv_hYT83rYI/AAAAAAAAB8s/7l5YRXMxVfQ/s912/Capture.JP what i have done is used the following \sigmaxx=E*\epsilonxx \deltaAB=\epsilonAB*AB since AB is on the x...
  16. C

    Structures and Materials problem - stress and strain

    Homework Statement A 4000 kg car traveling at 160 km/h crashes into a concrete post. If all the kinetic energy of the car is used to crush the low alloy steel at the front of the car, how many kg of steel will be crushed before the car stops? Properties of low alloy steel from a table of...
  17. G

    Stress and Strain, simple question Just need a clarification

    Homework Statement A tow truck is pulling a car out of a ditch by means of a steel cable that is 9.1 m long? and has a radius of 0.50 cm .when the car just begins to ,move , the tension in the cable is 980 N. how much has the cable stretched? Y steel= 2.0 x 10¹¹ N m² Homework...
  18. D

    Stress and strain in crystal structures

    Are there stress and strain graphs for different crystal structures?
  19. A

    How Much Ethanol Can Be Added to a Pressurized Tank?

    Homework Statement A moonshiner produces pure ethanol (ethyl alcohol) late at night and stores it in a stainless steel tank in the form of a cylinder 0.290 m in diameter with a tight-fitting piston at the top. The total volume of the tank is 275 L(0.250 m3) . In an attempt to squeeze a little...
  20. A

    How Is Displacement Calculated in a Shear Strain Scenario?

    Homework Statement A square steel plate is 10.0cm on a side and 0.500cm thick. Find the shear strain that results if a force of magnitude 9.0*10^5 is applied to each of the four sides, parallel to the side. I found the shear strain to be 2.4*10^-2 Find the displacement x in...
  21. Z

    Calculate Stress & Strain of Marble Column - 1.5m^2, 2.5x10^4kg

    A marble column of cross-sectional area 1.5 m^2 supports a mass of 2.5×10^4 kg. What is the stress within the column? What is the strain? I have already found the stress in the column by taking (25000kgx9.8 m/s^2)/1.5m^2 The problem is i have no clue how to find the strain given...
  22. M

    Roark's formulas for stress and strain

    Hi all, i hope that i am in the right forum. As you see in my topic i have a problem with Roark's formula especially for elastic stability of plates and shells. The formula i got a problem with is the following: If you have the book: sixth edition: page 689 table 35 formula 15. or...
  23. D

    How Do You Calculate Stress and Strain in a Stretched Copper Wire?

    The last question on my homework (always the hardest). Homework Statement A wire of diameter 1.0mm and length 2.3m is made of copper. Young modulus is 1.1 x 10^11. Find: a) The cross-section of the wire in m² b) The strain if the wire is stretched by 0.85mm c) The stress d) The force...
  24. P

    Wanted: Stress and Strain Tutorial

    Looking for a Tutorial on Stress and Strain and couldn't find it >.< Please help:frown:
  25. T

    Solve Stress and Strain Qs | Equations, Diagrams, Steps

    Q: A copper wire of diameter d is stretched by a load hanging vertically from its lower end . The strain of the wire is 8.0x10^-4 . What's the strain in another copper wire of the same length but of diamteter 2d ? A: 2x10^-4 Q: A light rod of length L hangs from the lower ends of two...
  26. D

    How Much Weight Can an 8mm Diameter Steel Bar Safely Support?

    The Ultimate tensile strength of steel is 470MPa. Assuming a factor of safety of 5 the maximum working load an 8.00mm diameter round steel bar should support against gravity is?
  27. K

    How does temperature affect the accuracy of a grandfather clock?

    A grandfather's clock is calibrated at a temperature of 20 degrees celcius. The pendulum is a thin brass rod with a heavy mass attached to the end. on a hot day, when the temperature is 30 degrees celcius does the clock 'run' fast or slow? how much time does it gain or lose in a 24 hour period...
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