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






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






3. The ease with which a material deforms without breaking






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






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






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






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






8. 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






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






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






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






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






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






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






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






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






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






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






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






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


21. 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






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






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






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






25. 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






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






27. 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






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






29. 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






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






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






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






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






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






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






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






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






38. Failure because of repeated stresses bellow the yield strength






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






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






41. Materials that can plastically deform without breaking






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






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






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






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






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






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






48. The study of crack growth leading to material failure






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






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