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






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






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






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






5. 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






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






7. 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






8. 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






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






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






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






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






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






15. 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






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






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






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






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






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






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






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






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






24. Failure because of repeated stresses bellow the yield strength






25. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






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






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






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






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 at which the material breaks completely during tensile testing






39. 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






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






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


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






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






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






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






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






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






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






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






50. 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