On the basis of extensive tests, the yield point of a particular type of mild steel-reinforcing bar is known to be normally distributed with o = 100. The composition of the bar has been slightly modified, but themodification is not believed to have affected either the normality or the value of o.(a) Assuming this to be the case, if a sample of 81 modified bars resulted in a sample average yield point of 8417 lb, compute a 90% CI for the true average yield point of the modified bar. (Round youranswers to one decimal place.)Ib(b) How would you modify the interval in part (a) to obtain a confidence level of 92%? (Round your answer to two decimal places.)|---Select--v should be changed to

Answered: On the basis of extensive tests, the…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Q4/ A. Explain why ceramic materials do not response to the plastic deformation processes? Also clarify why flexural test is applied to ceramics instead of tensile test? B. Estimate whether a cylindrical aluminum oxide sample will fail or not when it subject to flexural test to achieve flexural strength of 390 MPa knowing that the sample radius is 2.5 mm, separation distance is 30 mm, and the applied load is 620 N respectively.
A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 5.0 mm (0.20 in.); the specimen fractured at a load of 3000 N (675 lbf) when the distance between the support points was 40 mm (1.6 in.). Another test is to be performed on a specimen of this same material, but one that has a square cross section of 15 mm (0.6 in.) length on each edge. At what load would you expect this specimen to fracture if the support point separation is maintained at 40 mm (1.6 in.)?
A steel specimen is tested in tension. The specimen is 1" wide by 0.5" thick in the test region. By monitoring the stresses from the testing machine, it was found that the specimen yielded at a stress of 72 ksi and fractured at 96 ksi. (a). Determine the tensile loads at yield and at fracture
(a) the modulus of elasticity in GPa for the Aluminum B) the proportional limit in MPa for the Aluminum C) the ultimate strength in MPa for the Aluminum D) Ductility of material based on percent elongation
Given your understanding of what initiates and controls failure in materials, which of the following will increase the failure strength or lifetime of a test piece or component and why? a. Decreasing the difference between the maximum and minimum stress values, as this effects the stress concentration factor b. Decreasing the temperature below the brittle-ductile transition temperature, to make it harder C. Polishing to reduce surface defects Od. Increasing its volume, to give a larger cross sectional area Oe. Increasing the grain size so there are less grain boundaries to initiate failure
A ceramic sample with a rectangular section can support a load of up to 290 N under a common strength test for ceramics. Its flexural strength is then 78.3 MPa and the distance between support points is 45 mm. What would be the dimensions of this sample if its width were twice its height?
A cylindrical specimen of undeformed brass that has a diameter of 300 mm is elastically deformed to a tensile strain of 0.001. If the Poisson's ratio for this brass is O.35, what is the change in specimen diameter? O Decrease by 3.00 x 104 m O Decrease by 1.05 x 104 m O Increase by 1.05 x 104 m O Increase by 0.028 mm
After an inspection it is found that a structural ceramic part has no flaws greater than 100 micrometers in size, calculate the maximum service stress (in MPa) available with SiC. Assume that Y= 1
The stress-strain tests were carried out on five different metals (A, B, C, D and E) and the results are shown in the figure below. Select the metal for given properties. Stress L ii. iii. iv. V. vi. B Strain Property Highest resistance to plastic strain Lowest stiffness Highest ductility Highest brittleness Highest tensile strength Lowest fracture strength Metal (A, B, C, D or E) N

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