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






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






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






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






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






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






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






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






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






11. 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






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






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






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






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






16. Failure because of repeated stresses bellow the yield strength






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






18. 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






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






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






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






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






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






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






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


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






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






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






30. 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






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






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






33. 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






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






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






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






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






38. Materials that can plastically deform without breaking






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






40. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






49. The study of crack growth leading to material failure






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