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






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






3. 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






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






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






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






7. The ease with which a material deforms without breaking






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






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






10. 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






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






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






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






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






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






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






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






18. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






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






27. The study of crack growth leading to material failure






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






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






30. 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






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






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






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






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






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






36. 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






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






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






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






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






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






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






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


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






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






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






47. 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






48. Failure because of repeated stresses bellow the yield strength






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






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