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






2. The ease with which a material deforms without breaking






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






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


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






6. 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






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






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






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






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






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






12. 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






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






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






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






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






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






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






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






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






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






22. 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






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






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






25. 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






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






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






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






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






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






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






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






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






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






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






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






37. 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






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






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






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






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






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






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






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






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






46. The study of crack growth leading to material failure






47. 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






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






49. Materials that can plastically deform without breaking






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






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