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






2. 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






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






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






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






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






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






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






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






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






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






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






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






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






15. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






24. 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






25. Materials that can plastically deform without breaking






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






27. 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






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






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






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






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






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






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






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






35. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






41. 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






42. 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






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






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






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






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






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






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






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






50. The study of crack growth leading to material failure