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






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






3. Materials that can plastically deform without breaking






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






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






6. 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






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






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






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






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






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






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






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






14. 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






15. 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






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






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






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






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






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






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






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






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






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






25. 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






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






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






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






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






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


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






33. 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






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






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






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






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






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






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






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






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






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






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






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






45. The ease with which a material deforms without breaking






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






47. The study of crack growth leading to material failure






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






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






50. 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