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






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






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






4. 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






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






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






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






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






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






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






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






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






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






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






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






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






17. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






25. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






32. Materials that can plastically deform without breaking






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






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






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






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






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






38. 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






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






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






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






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






43. 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






44. The study of crack growth leading to material failure






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






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






47. 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






48. 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






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






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