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






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






3. 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






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






5. 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






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






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






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






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






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






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






12. Materials that can plastically deform without breaking






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






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






15. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






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






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






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






27. The study of crack growth leading to material failure






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






29. The ease with which a material deforms without breaking






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


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






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






33. 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






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






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






36. 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






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






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






39. 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






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






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






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






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






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






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






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






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






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






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






50. 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