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






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






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






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






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






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






8. The study of crack growth leading to material failure






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






10. 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






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






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






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






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


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






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






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






18. 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






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






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






21. 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






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






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






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






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






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






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






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






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






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






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






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






33. 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






34. 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






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






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






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






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






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






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






41. Materials that can plastically deform without breaking






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






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






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






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






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






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






48. Failure because of repeated stresses bellow the yield strength






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






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