Final Exam 2005 - Materials 1M03 Test#2 2005 Last Name...

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Materials 1M03, Test #2 2005 Last Name:_____________________________ First Name: ______________________ Student ID#: _________________________ Tutorial Section:_____________________ MATERIALS 1M03 Final Exam, 2005 This test contains 15 pages and 28 questions. You are responsible for ensuring that your copy of the paper is complete. Bring any discrepancy to the attention of your invigilator. A 1 2 Total SPECIAL INSTRUCTIONS: Aids allowed: McMaster standard Casio FX-991 calculator You are permitted to bring in a single page crib sheet 8½ by 11 in. with whatever you want on both sides. Answer all multiple choice questions on the special answer sheet only. Answer all written questions on the examination copy. Be sure to show your work so that part marks can be awarded for incomplete answers. Be sure to include units with all answers that require them. Marks will be deducted for using an inappropriate number of significant digits in your final answer, but always use a minimum of three significant figures. The value of each question is shown. The total for the exam is 55 marks Useful constants: Gas constant, R = 8.31 J/mol-K Charge per electron, e = 1.6 x 10 -19 C Avogadro’s number, N A = 6.02 x 10 23 Boltzmann’s constant, k = 1.38 x 10 -23 J/atom-K = 8.62 x 10 -5 eV/atom-K 1cal =4.184J Page of 15 1
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Materials 1M03, Test #2 2005 Part A: The following multiple choice questions are worth 3 marks each. In each case, put your answers on the scan sheet (marked McMaster University Examination Answer Sheet). Read the Marking Directions on this sheet carefully before starting. 1. What is the maximum stress that exists at the tip of a crack having a radius of curvature and a half-length a= when a tensile stress of 155Mpa is applied? -4 1.8×10 mm -5 2.1×10 m a. 3.35GPa b. 9.8Gpa c. 3200MPa d. 9000Mpa e. none of the above 2. A plate of steel 1.5mm thick has nitrogen atmosphere on both sides at a temperature of 1200C and is permitted to achieve steady state diffusion. The diffusion coefficient of nitrogen in steel at this temperature is 6×10 , and the diffusion flux is measured to be 1.2×10 . It is also known that the concentration of nitrogen on the high pressure surface is ,How far into the plate from the high pressure side will the concentration be 1.8k -11 2 m /s 2 g/m 2 g/m -7 2 kg/m -s 4k 3. Which of the following statements about failure is most correct: solid, transgranular fracture occurs when a crack propagates along grain boundaries of a solid. Brittle materials exhibit substantial plastic Page of 15 2
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Materials 1M03, Test #2 2005 deformation before fracture while ductile materials exhibit smooth surfaces after fracture. a solid, intergranular fracture occurs when a crack propagates along grain boundaries of a solid. Brittle materials exhibit substantial plastic deformation before fracture while ductile materials exhibit smooth surfaces after fracture. solid, transgranular fracture occurs when a crack propagates along grain boundaries of a solid. Brittle and ductile materials exhibit significant plastic deformation before fracture. solid, intergranular fracture occurs when a crack propagates along grain boundaries of a solid. Ductile materials exhibit substantial plastic deformation before fracture while brittle materials exhibit smooth surfaces after fracture.
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