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






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






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






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






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






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






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






8. 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






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






10. The study of crack growth leading to material failure






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






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






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






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






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






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






17. 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






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






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






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






21. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






28. 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






29. Materials that can plastically deform without breaking






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






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






32. 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






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






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






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






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


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






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






41. 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






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






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






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






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






46. The ease with which a material deforms without breaking






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






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






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






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