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






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






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






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






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






6. The ease with which a material deforms without breaking






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






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






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






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






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






12. Failure because of repeated stresses bellow the yield strength






13. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






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






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






24. 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






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






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






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






28. 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






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






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






31. 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






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






33. 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






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






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


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






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






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






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






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






41. 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






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






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






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






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






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






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






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