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






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






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






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






5. Failure because of repeated stresses bellow the yield strength






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






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






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






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






10. 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






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






12. 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






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






14. 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






15. The study of crack growth leading to material failure






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






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






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


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






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






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






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






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






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






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






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






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






28. Materials that can plastically deform without breaking






29. 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






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






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






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






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






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






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






36. 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






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






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






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






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






41. 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






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






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






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






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






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






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






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






49. The ease with which a material deforms without breaking






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