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Modern Material Science And Engineering 4

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • 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. 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






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






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






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






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






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






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






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






9. The ratio of applied load to cross - sectional area






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






11. The area contained under the elastic portion of a stress - strain curve - which represent how much energy the material can absorb before permanently beforming






12. Materials that fail completely at the onset of plastic deformation. these materials have linear stress - strain curves






13. 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






14. The study of crack growth leading to material failure






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






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






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






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






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






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






21. An estimate of the transition between elastic stretching and plastic deformation for a material without a linear region stress - strain curve






22. Materials that can plastically deform without breaking






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






24. The stress at the point of transition between elastic stretching and plastic deformation






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






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






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






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






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






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






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






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






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






34. The region on the stress - strain curve in which the material has experienced a change from which it will not completely recover






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






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






37. Failure because of repeated stresses bellow the yield strength






38. 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






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






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






41. 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






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






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






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






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






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






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


48. The first stage of creep - during which dislocations in a material slip and move around obstacles






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






50. 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