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






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






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






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






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






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






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






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






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






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






11. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






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






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






22. 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






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






24. Materials that can plastically deform without breaking






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






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


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






28. Failure because of repeated stresses bellow the yield strength






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






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 stress at the highest applied force on a stress - strain curve






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






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






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






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






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






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






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






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






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






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






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






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






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






46. 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






47. 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






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






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






50. 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