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






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






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






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






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






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






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






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






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






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






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






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






13. The ease with which a material deforms without breaking






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






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






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






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






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


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






22. 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






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






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






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






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






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






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






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






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






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






32. 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






33. 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






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






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






36. 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






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






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






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






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






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






42. 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






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






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






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






46. 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






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






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






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






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