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Modern Material Science And Engineering 4

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 2 minutes extra for reading the instructions.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A curve plotting the results of testing multiple samples at different stress levels that used to to determine the fatigue life of a material at a given stress level






2. An impact test similar to the charpy test in which the sample is aligned vertically with the notch facing away from the hammer






3. The final stage of creep - during which the rate of deformations accelerates rapidly and continues until rupture






4. The region on a stress - strain curve in which no permanent changes to the material occur






5. The value that the stress concentration factor must exceed to allow a crack to propogate






6. Stress values not involving the presence of stress raisers in the material






7. Method used to determine fatigue by alternating compressive and tensile forces on the sample






8. The fracture toughness above the critical thickness in which the width of the material no longer impacts the fracture toughness






9. The stress level below which there is a 50% probability that failure will never occur






10. The amount of energy lost as the test sample is destroyed during an impact test






11. The number of cycles at a given stress level that a material can experience before failing






12. Relates the longitudinal deformation and the lateral deformation of material under stress


13. The stress at the highest applied force on a stress - strain curve






14. The ratio of the maximum stress to the applied stress






15. The ease with which a material deforms without breaking






16. A method used to measure the flexural strength of a sample






17. The amount of flexural stress a material can withstand before breaking. measured through the bend test






18. The transition of some metals in which a change in temperature causes them to transform between ductile and brittle behavior






19. A period used to force the same aging processes to occur on a sample in a shorter amount of time






20. Stresses that act perpendicularly to the direction of the crack - causing the crack ends to pull apart and opening the crack further






21. The change in the slope of the strain - time plot at any given point during a creep test






22. Cracks - voids - and other inperfections in a material that cause highly localized increases in stress






23. The stress at which the material breaks completely during tensile testing






24. Materials that can plastically deform without breaking






25. A limit placed on the accuracy of a reported mean - based on the number of samples tested - the standard deviation - and the desired level of confidence






26. The square root of the variance. this value provides more knowledge about the distance from the mean a random sample is likely to be






27. The ratio of the elastic energy to the strain at yielding - which determines how much energy will be used for deformation and how much will be translated to motion






28. Plastic deformation of a material under stress at elevated temperatures; occurs due to dislocations in the material






29. The application of stress perpendicular to a crack - wich pulls the top and bottom potions in opposite directions






30. The slope of the stress - strain curve in the elastic region. aka Young's Modulus and Tensile Modulus






31. Failure because of repeated stresses bellow the yield strength






32. A property defining a materials resistance to a blow that is measured by an impact test






33. A single blow test names after Charpy in which a notched test sample is broken by a swinging pendulum






34. A method used to measure the resistance of the surface of a material to penetration by a hard object under a static force






35. A specific method of measuring the resistance of a materials surface to penetration by a hard object under a static force






36. A statistical table based on the degrees of freedom and the level of uncertainty in a set of reported sample values






37. A method used to determine the tensile strength - breaking strength - and the yield strength of a sample






38. Guidelines published by the American Society for Testing and Materials that provide detailed testing procedures to ensure that tests performed in different laboratories are directly comparable






39. The application of stresses parallel to a crack causing the top portion to be pushed forward and the bottom portion to be pulled in the opposite direction






40. A ratio of the force applied to a sample and the instantaneous length of the chain to the initial length of the chain






41. Term that accounts for the increased stress applied to an elliptical crack whose length is much greater than its width






42. A statistical quantity that takes into account the random error from a variety of sources and provides infromation about the spread of the data






43. A value used to characterized creep based on time - temperature - and material- specific constants






44. A property determined by measuring the change in the length of a sample to initial length of the sample






45. The resistance of the surface of a material to penetration by a hard object under static force






46. A value used to determine if two distinct sets of examples are statistically different






47. One of the many scales used to evaluate the resistance of a materials surface to penetration by a hard object under static force






48. The sudden decrease in cross - sectional area of a region of a sample under a tensile load






49. The degree of certainty in an estimate of a mean






50. The stage in which the rate that dislocations propagate equals the rate at which the dislocations are blocked - resulting in a fairly linear region on the strain - time plot