1. Which ASTM Testing Standards define the testing methodology for impact testing of: a. Metallic Materials b. Plastic Materials 2. Describe the difference between Ductile and Brittle Fracture in polycrystalline materials

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 <

You have been asked to draw up a specification for a ceramic cladding tile that is likely to experience tensile stresses of 64 MPa during its installation and service lifetime. If the ceramic has a specific surface energy of 0.28 J/m2 and its Youngs Modulus is 82 GPa what would be the maximum length of an internal flaw that would not result in fracture of the tile? (This question has only one correct answer) O a. 3.79 mm O b. 7.14 mm c. 7.57 um Ο d.3.79 μm O e. 3.57 µm O f. 3.57 mm g. 7.14 um

A tension test was conducted for a cylindrical specimen of stain-less steel having an initial diameter (D) of 10.85 mm. Calculate the percentage reduction in area if the fracture diameter of the specimen (d) is 6.15 mm. Select one: O a. 68.87% O b. 69.87% c. 66.87% O d. 67.87%