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






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






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






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






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






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


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






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






9. 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






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






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






12. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






26. The study of crack growth leading to material failure






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






28. The ease with which a material deforms without breaking






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






30. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






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






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






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






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






41. 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






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






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






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






45. Materials that can plastically deform without breaking






46. 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






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






48. 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






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






50. 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