Test your basic knowledge |

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






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






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






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






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






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






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






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






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






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






11. Failure because of repeated stresses bellow the yield strength






12. 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






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






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






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






16. 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






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






18. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






27. The ease with which a material deforms without breaking






28. 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






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






30. 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






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






32. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






47. The study of crack growth leading to material failure






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






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






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