Test your basic knowledge |

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






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






3. 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






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






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






6. The study of crack growth leading to material failure






7. 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






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






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






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






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






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






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






14. Materials that can plastically deform without breaking






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






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






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






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






19. 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






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






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






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






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






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






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






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






27. 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






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






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






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






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






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






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






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






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






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






37. Failure because of repeated stresses bellow the yield strength






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






39. The ease with which a material deforms without breaking






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






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






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






43. 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






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






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






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






47. 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






48. 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






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


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