If you have a material that is initially hard and strong, would you expect it to cyclically harden or soften? What would be a way of characterizing how strong it must be initially to make your answer a bit more quantitative?

You have been given the following test sample data following mechanical testing of 15 test pieces of a transformation toughened zirconia. What is the Weibull modulus of this material? Would you advise the use of this material over one with a Weibull Modulus of 25.4 and a mean failure stress of 235 MPa, if you anticipate that the peak stress on the material could be 220 MPa? (Since this question has two parts, you must select the two correct options from the list below) Test Sample Failure Stress (MPa) 1 255 2 271 3 260 4 223 5 257 6. 267 7 242 8 230 9. 245 10 225 11 254 12 236 13 238 14 251 15 264 O a. 27.3 O b. 4.5 O c. 6.9 O d. Yes е. 15.2 O f. 18.3 O g. No O O O O O O O

Regarding annealing, choose the right answer (One or more): The actual annealing time must be long enough to allow for any necessary transformation reactions that may occur Annealing can be performed to release internal stresses of the material The main purpose of annealing is to decrease or restore material's ductility Time isn't a significant parameter in annealing process If the rate of temperature change is too great, temperature gradients and internal stresses may be induced that may lead to warping or even cracking

1 You want to produce a Brass plate that is 0.25" thick with a yield stress 50 ksi which corresponds to 37.5% cold work. The initial plate thickness is 1.0". The maximum cold work per step is 60%. What are the cold work and annealing steps that are necessary to achieve the desired result?

How stress and strain relate to elastic deformation? What is the ultimate strength and how can it be determined? Stress and strain: What are they and why are they used instead of load and deformation? Elastic behavior: When loads are small, how much deformation occurs? Toughness and ductility: What are they and how do we measure them?

What is the failure due to fatigue? What factors influence the fatigue strength of the material? Under what loading types and materials would you use it?

Fatigue in the material

What is the effect of strain hardening on the material?

3. A 30-cm long, 12-mm diameter carbon steel rod was subjected to 15,5 kN of tension. Calculate (a) the stress and strain in the rod, (b) the amount that it stretches, (c) its change in diameter, and (d) its stiffness (k=EA/L). (e) If the force was only 4.5 kN, by what amount would the rod have stretched?

Consider the following figure that shows tensile stress-strain curves for four differentmaterials. The “cross” ( x ) represents the rupture point. Please answer following questions.