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






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






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






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






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






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






7. 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






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






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






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






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






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






13. The ease with which a material deforms without breaking






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






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






16. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






31. 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






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






33. Failure because of repeated stresses bellow the yield strength






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






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






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


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






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






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






40. The study of crack growth leading to material failure






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






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






43. 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






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






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






46. Materials that can plastically deform without breaking






47. 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






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






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






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