Of the materials shown with a tensile strength of 1000 MPa, the
densest ones are
high carbon steel
nickel-based superalloys
titanium alloys
tungsten alloys
For a brass alloy, the tensile strength is 400 MPa, the yield
strength is 315 MPa and the modulus of elasticity is 100 GPa.
(a) What is the maximum load that may applied to the specimen
with a cross sectional area of 130 mm2 before it fractures?
(b) For the same cross sectional area, if the original length of
the specimen is 75 mm what will be the length of the specimen, when
a load of 13000 N is applied...
low carbon steel having a tensile strength of 350 MPa and shear
strength of 250 MPa is cut in a turning operation with a cutting
speed of 200 m/min. The feed is 0.3 mm/rev and the depth of cut is
4.8 mm. The rake angle of the tool is 12 degrees in the direction
of chip flow. The resulting chip ratio is 0.8. Using the orthogonal
model as an approximation of turning determine...
a.The shear plane angle.
b. Shear force...
An engineer studying the
tensile strength of a composite material knows that tensile
strength is approximately normally distributed with
σ = 60 psi. A random sample of 20 specimens has a mean
tensile strength of 3450 psi.
(a) Test the hypothesis that
the mean tensile strength is 3500 psi, using α =
0.01
(b) What isthe smallest level
of significance at which you would be willing to reject the null
hypothesis?
(c) What is the β error for
the test...
An ASTM A36 steel having a yield strength of 235 MPa, a tensile
strength of 640 MPa, and an endurance limit of 210 MPa is subjected
to a cyclic loading. Using the Goodman diagram, predict whether the
material has an infinite fatigue life, or whether it will fail by
yielding or fatigue, when the cyclic stress is between:
(i) 0 and 250 MPa.
(ii) 95 ± 220 MPa
Tensile tests of a 3D printed material show that the average
yield strength of that material is about 800 MPa with a standard
deviation of 40 MPa. Due to the variations of the process
parameters, the yield strength can vary, and historical data show
that yield strength of the material follows a uniform continuous
distribution. Answer questions 1a to 1e using this information.
1.If yield strength of the material is uniformly distributed
between 730.72 to 869.28, what is the expected...
The average tensile strength of carbon fiber cloth is 600 MPa.
You are testing a new weaving pattern for the carbon fiber threads
and want to know if this new weave causes a difference in the
tensile strength. After testing 18 samples of the new weave, you
found a sample average of 585 MPa with a standard deviation of 34
MPa. At a significance level of 0.05, test to see if this new weave
has a different mean than 600...
A process produces components with mean tensile strength of 85
MPa and standard deviation of 13 MPa. If the lowest acceptable
strength is 40 MPa, what ppm of samples would be defective?
An engineer who is studying the tensile strength of a steel
alloy knows that tensile strength is approximately normally
distributed with sigma= 60 psi. A random sample of 12 specimens has
a mean tensile strength of 3450 psi.
a) Compute a two-side confidence interval on the maen tensile
strength at a 95% confidence level.
b) Test the hypothesis that the mean strength is 3500 psi at
alfa=0.05, and provide a conclusion statement.
c) If we keep the signifiance level constant...