if the coldworked radius is twenty mm, now what is the radius before being deformed if the ductility percent EL of a coldworked element Cu cylidrical specimen is twenty-five percent?

During 650°C, the average grain diameter of a brass material was measured as a function of time, as seen below at two distinct points of Time (min) Grain Diameter (mm) 30                            3.9 × 10^-2 90                            6.6 × 10^-2 a. What was the grain diameter at the start? (orig diameter) b. What is the expected grain diameter after 150 minutes at 650 °C?

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Example 2: Consider constant pressure complete combustion of stoichiometric liquid octane-air and octane air with 10% excess air mixture initially at 298K and 1 atm. Compare the adiabatic flame temperature vlaues.

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•Is it true that the material imperfections, is due to the tensile fracture of a brittle material?

show the work by steps. only HANDWRITTEN answer needed ( NOT TYPED)

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Suppose that a wing component on an aircraft is fabri- cated from an aluminum alloy that has a plane-strain fracture toughness of 26.0 MPa Vm (23.7 ksi Vin.). It has been determined that fracture results at a stress of 112 MPa (16,240 psi) when the maximum internal crack length is 8.6 mm (0.34 in.). For this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 6.0 mm (0.24 in.).