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






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






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






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






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






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






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






8. 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






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






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






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






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






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






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






15. Materials that can plastically deform without breaking






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






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






18. Failure because of repeated stresses bellow the yield strength






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






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






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






22. The study of crack growth leading to material failure






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






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






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






27. 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






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






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






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






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






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






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






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






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






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






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






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






40. 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






41. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






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






Can you answer 50 questions in 15 minutes?



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