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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 degree of certainty in an estimate of a mean






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






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






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






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






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






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






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






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






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






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






12. 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






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


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






15. The ease with which a material deforms without breaking






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






17. 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






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






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






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






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






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






23. 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






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






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






26. 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






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






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






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






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






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






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






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






34. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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