A Rockwell hardness measurement is made on a ductile iron (80-55-06 as cast) and the obtained Rockwell hardness R scale is 13 HRC. Predict the tensile and yield strengths of this material.

Based on the stress-strain plots, which materials tested are stiff and which are tough? How can you tell the difference? * we tested (Steel HR250)and (Aluminium 5251)in this experiment

(ii) The turbine blade root is found to contain a surface fatigue crack of 3.3 mm during a routine maintenance inspection. The major stop-start load cycle is experienced twice per day with a minimum stress of 34 MPa and a maximum stress of 195 MPa. The turbine blade has a KIC of 75 MPa√m. Fatigue crack growth rate data for this alloy is given by: the Paris law constant, A = 4.5 x 10-11 and the Paris law exponent, m = 3.8. How many more stop-starts would you recommend be used? Explain your reasoning. You can assume the shape factor Q = 1.2, K is in MPaNm and a (crack length) is in m

Determine the material property of the materials from the following website. Material Property Data (www.matweb.com) e Material: Carbon Steel C1045 (AISI 1045) Cold Drawn 1 in. round Property: Ultimate Tensile Strength (psi) 49,900

Determine the material property of the materials from the following website. Material Property Data (www.matweb.com) Material: Carbon Steel C1045 (AISI 1045) Cold Drawn - 1 in. round Property: %Elongation at Break (%) 12

For a certain high-temperature alloy, failure was reported after 4100 hrs at 680°C when subjected to a stress level of 270 MPa. If the same stress were applied at 725°C, how long would the sample be expected to last? State any assumptions you must make to allow you to make this determination.

In the Table below Data for Mar M 247-a Nickel base superalloy is shown. (1) Plot the steady state strain rate and time to rupture to predict a relationship between the two variables. Provide an equation for the relationship that you see. (2) Give an explanation as to why the fracture elongation is going up with stress.

A high-strength steel has yield strength of 1165 MPa and fracture toughness of 95 MPavm. Calculate the size of an internal crack that will lead to catastrophic failure at an applied stress of 80% yield strength. (Y = 1.00 for internal crack, and Y=1.12 for surface crack)

Draw a Stress/Strain graph of a mild tensile steel and identify the limit of proportionality and the yield point

What is the maximum internal flaw size allowable for a 304 Stainless steel alloy that is loaded to a stress two thirds of its yield strength (205 MPa) and it has a fracture toughness of 95 MPa.m0.5. Assume a value of 1.3 for Y