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






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






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






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






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






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






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






9. 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






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






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






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






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






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






15. 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






16. The study of crack growth leading to material failure






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






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






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






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






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






24. Failure because of repeated stresses bellow the yield strength






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






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






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






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






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






30. 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






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






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






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






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






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






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






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






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


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






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






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






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






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






44. 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






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






46. 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






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






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. The ease with which a material deforms without breaking






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