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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 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






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






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






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






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






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






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






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






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


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






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






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






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






14. 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






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






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






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






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






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






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






21. 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






22. The ease with which a material deforms without breaking






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






24. 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






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






26. The study of crack growth leading to material failure






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






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






29. Materials that can plastically deform without breaking






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






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






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






33. 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






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






35. 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






36. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






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






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






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






48. 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






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






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