Test your basic knowledge |

Modern Material Science And Engineering 4

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 1 minute extra for reading the instructions.
  • 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 method used to determine the tensile strength - breaking strength - and the yield strength of a sample






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






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






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






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






6. The study of crack growth leading to material failure






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






8. 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






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






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






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






12. The ease with which a material deforms without breaking






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






14. 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






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






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






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






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






19. 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






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






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






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






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






24. Materials that can plastically deform without breaking






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


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






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






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






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






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






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






32. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






41. 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






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






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






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






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






46. 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






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






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






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