Question

Q3: Tension test was conducted on a mild steel rod having diameter 1.5 cm and length 20 cm. While applying a load of 10 kN, there will be an extension of 0.012 cm on a length of 20 cm. Maximum load carried by the rod was found to be 26 kN and the load beyond which stress is not proportional to strain was observed to be 11 kN. When the specimen breaks, the extension of the rod for 20 cm length was found to be 6.15 cm and the diameter at the fracture was 0.57 cm. Based on the test results determine the values for the stress corresponding to the limit of proportionality, modulus of elasticity, percentage elongation and percentage contraction of area at the fracture? Instead of mild steel when a brass rod having same diameter is tested within the elastic limit, extension of the rod was found to be 30% more than that of steel rod for a length of 20 cm. What will be the changes in the values for percentage increase in stress and strain? Given Modulus of elasticity of brass is equal to 0.9 times modulus of elasticity of steel. Suggest the methods to modify the stress strain behavior of both materials based on the findings.

Answer #1

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A normal mild steel specimen having 50 mm 2 cross section area
and 10 cm long
gauge length was tested.
1. Draw the stress- strain diagram
2. calculate the final length of the bar compare when the
specimen
unloaded from 400 MPa?
3. calculate the elastic and plastic deformation when the
specimen
unloaded from 400 MPa
Proportionality limit Ultimate Load Failure Load
Stress (MPa) 320////// 500 /////////400
Strain 0.0018 //// 0.06///////// 0.12

A rod, 120.0 cm long and of diameter 3.00 cm is subjected to an
axial pull of 18.0 kN. Axial means in the direction of the length
of the rod. Find the stress in N/mm2 .
(Continued from the previous question)
A steel rod, 120.0 cm long and of diameter 3.00 cm is subjected
to an axial pull of 18.0 kN. Axial means in the direction of the
length of the rod. What is the percentage of the resulting
strain?

A cylindrical specimen of stainless steel having diameter of
12.8 mm and a guage length of 50.88 mm(2.000in.) is pulled in
tension. Use the load-elongation characterisitcs shown in the
following table. Plot the data as engineering stress vs.
engineering strain. Then compute the modulus of elasticity, yeild
strength at a strain offset of 0.002, determine the tensile
strength of this alloy, approximate ductility in percent elongation
and the modulus of resilience.
N
mm
0
50.8
12700
50.825
25400
50.851
38100...

Problem. A cylindrical specimen of a hypothetical metal having a
diameter of 7.671 mm and a gauge length of 251.905 mm is pulled in
tension. Use the loadâ€“elongation characteristics shown in the
following table to complete parts (a) through (f).
(a) Plot the data as stress (MPa) versus strain
(b) Compute the modulus of elasticity in GPa
(c) Determine the yield strength at a strain offset of 0.002
(d) Determine the tensile strength of this alloy
(e) What is the...

A rod has a square cross section of (5 x 5) mm. length of the
rod is 120 cm. The allowable stress is 400 MPa. After applying the
load (F), square section changes to (4.95 x 4.95) mm.
1. What is the type of the load (F), is it tension or
compression?
2. What is the longitudinal strain in steel rod?
3. What is the modulus of elasticity of the material of the
rod?
4. What is the value of...

A metal cylinder has an original
diameter of 1.00 cm and length of 5.00 cm. A tension test was
performed on the specimen and the data are listed in the table
below.
Load
(kN)
Elongation (cm)
0.00
0.0000
1.51
0.0006
4.61
0.0016
8.01
0.0026
11.01 0.0036
11.71 0.0051
11.81
0.0081
12.01
0.0201
16.61 0.0401
20.01 0.1001
21.51
0.2801
19.51
0.4001
18.51
0.4601
a) Graph the stress on...

Q2: Three steel plates each having thickness 1.2 cm and width 6 cm
are joined by using two rivets having diameter 15 mm each. When the
plates are subjected to an external force of 65 MN, what will be
the shear stress developed in the rivet? If the ultimate shear
strength on the rivet is limited to 1500 tonnes/cm2, what will be
the maximum load that can be carried by the plate? Instead of three
plates, if two steel plates...

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