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






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






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






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






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






6. The change in the slope of the strain - time plot at any given point during a creep 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. The application of stress perpendicular to a crack - wich pulls the top and bottom potions in opposite directions






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






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






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






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






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






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






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






16. Failure because of repeated stresses bellow the yield strength






17. Materials that can plastically deform without breaking






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






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






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






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






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






23. 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






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






25. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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


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






42. 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






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






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






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






46. The ease with which a material deforms without breaking






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






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






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