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






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






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






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






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






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






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






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






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






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






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






12. 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






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






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






15. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






21. 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






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






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






24. 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






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






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






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






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






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






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






31. The ease with which a material deforms without breaking






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






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






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






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






36. 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






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






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






40. Materials that can plastically deform without breaking






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






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






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






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






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






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






47. 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






48. 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






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






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