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






3. 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






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






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






6. 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






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






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






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






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






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






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






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






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


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






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






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






18. Materials that can plastically deform without breaking






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






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






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






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






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






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






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






26. The study of crack growth leading to material failure






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






28. 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






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






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






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






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






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






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






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






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






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






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






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






40. The ease with which a material deforms without breaking






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






42. 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






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






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






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






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






47. 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






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






49. 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






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