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 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






2. 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






3. The study of crack growth leading to material failure






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






5. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






14. 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






15. 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






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






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






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






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






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






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






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






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






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






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






26. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






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






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






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






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






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






40. 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






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






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






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


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






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






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






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






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






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






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