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






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






3. The study of crack growth leading to material failure






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






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






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






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






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






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






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






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






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. The ratio of applied load to cross - sectional area






14. Failure because of repeated stresses bellow the yield strength






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






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






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






18. The ease with which a material deforms without breaking






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






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






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






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






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






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






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






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






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






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






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






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






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






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

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33. 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






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






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






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






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






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






39. 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






40. 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






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






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






43. Materials that can plastically deform without breaking






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






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






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






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






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






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






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