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






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






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






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






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






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






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






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






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






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






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






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






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






14. Failure because of repeated stresses bellow the yield strength






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






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






17. Materials that can plastically deform without breaking






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






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






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






21. 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






22. The study of crack growth leading to material failure






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






24. 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






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






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






27. 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






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






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






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






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






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






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






34. 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






35. 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






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






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






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






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






40. The ease with which a material deforms without breaking






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






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






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






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






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






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


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






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






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






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