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






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






3. The study of crack growth leading to material failure






4. Failure because of repeated stresses bellow the yield strength






5. 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






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






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






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






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






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






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






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






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






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






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






16. 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






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






18. 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






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






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






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






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






23. 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






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






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






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






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






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






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. 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






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






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






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






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






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






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






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

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






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






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






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






42. 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






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






44. 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






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






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






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






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






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






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