ASTM Standard E23 defines standard test methods for notched bar impact testing of metallic materials. The Charpy V-notch (CVN) technique measures impact energy and is often used to determine whether or not a material experiences a ductile-to-brittle transition with decreasing temperature. Ten measurements of impact energy (J) on specimens of A238 steel cut at 60°C are as follows: 64.1, 64.7, 64.5, 64.6, 64.5, 64.3, 64.6, 64.8, 64.2, and 64.3. Assume that impact energy is normally distributed with o = 1 J. Find the 95% Cl for µ, the mean impact energy.

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You have been given the following test sample data following mechanical testing of 15 test pieces of Silicon Nitride. What is the Weibull modulus of this material? Would you advise the use of a similar material with a Weibull Modulus of 16.3 and a mean failure stress of 485 MPa, if you anticipate that the peak stress on the material could be 430 MPa? Sample 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Select one or more: O a. No O b. 18.6 O C. 13.4 O d. Yes O e. 15.7 f. 17.1 Failure Stress (MPa) 423 459 496 432 447 467 473 499 485 479 505 530 526 490 510 <

To manufacture a piston with a circular cross section, an alloy steel bar is required whose length is fixed and has a value of 35 cm and must withstand a compression load of 5.2 tons. For its design, a safety factor of 4/5 is suggested with respect to the yield stress. The shear modulus for that alloy is 80 GPa.To know the resistance of this steel alloy, a compression test was carried out on a specimen of the same material, from this test the data table of stress against engineering deformation shown was obtained. Image 1 1) Calculate the increase in the diameter of the bar when the load is applied2) Define the Poisson's ratio and calculate its value