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






2. 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






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






4. Failure because of repeated stresses bellow the yield strength






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






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






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


8. 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






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






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






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






12. The ease with which a material deforms without breaking






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






14. 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






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






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






17. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






31. 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






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






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






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






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






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






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






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






39. Materials that can plastically deform without breaking






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






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






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






43. The study of crack growth leading to material failure






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






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






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






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






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






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