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






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






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






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






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






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






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






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






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






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






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






14. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






28. 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






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


30. The study of crack growth leading to material failure






31. 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






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






33. Materials that can plastically deform without breaking






34. 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






35. 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






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






37. 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






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






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






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






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






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






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






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






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






46. 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






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






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






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






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