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






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






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






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






5. 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






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






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






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






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






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






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






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






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






15. The study of crack growth leading to material failure






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






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






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






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






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






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






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






23. 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






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






25. Materials that can plastically deform without breaking






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






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






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






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






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






31. 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






32. 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






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






34. Failure because of repeated stresses bellow the yield strength






35. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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


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






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






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






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






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






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






50. 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