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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. 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






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






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






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






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






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






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






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






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






10. 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






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






12. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






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






22. 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






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






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






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






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






27. A nonlinear - qualitative scaled used to evaluate the resistance of a materials surface to penetration by a hard object






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






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






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






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






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






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






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






35. 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






36. Failure because of repeated stresses bellow the yield strength






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






38. The study of crack growth leading to material failure






39. The ease with which a material deforms without breaking






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. The degree of certainty in an estimate of a mean






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






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






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






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






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






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






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


50. Test that approximate the impact of an environmental variable on a material over time by exposing the material to a higher level of that variable for shorter times