What is Stress and strain: Definition and 76 Discussions
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.
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...
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...
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) *...
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...
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...
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...
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...
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...
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...
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 -...
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) =...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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?
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...