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






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






3. 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






4. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






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






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






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






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






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






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






19. The ease with which a material deforms without breaking






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






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






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






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






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






25. 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






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






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






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






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






30. 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






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


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






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






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






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






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






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






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






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






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






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






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






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






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






45. 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






46. Materials that can plastically deform without breaking






47. 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






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






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






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