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. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






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






11. 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






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






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






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






15. The ease with which a material deforms without breaking






16. 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






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






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






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






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






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






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






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






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






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






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






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






29. 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






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






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






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






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






34. 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






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






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


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






38. 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






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






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






41. The study of crack growth leading to material failure






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






43. Materials that can plastically deform without breaking






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






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






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






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






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






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






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