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






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






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






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






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






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






7. 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






8. 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






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






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






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






13. 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






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






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






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






17. 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






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






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






20. Failure because of repeated stresses bellow the yield strength






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






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






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






24. The study of crack growth leading to material failure






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






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






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






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






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






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






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






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






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






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






35. 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






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






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






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






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






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






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


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






43. The ease with which a material deforms without breaking






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






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






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






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






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






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






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