Test your basic knowledge |

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






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






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






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






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






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






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






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






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






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






12. 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






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






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






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






16. The ease with which a material deforms without breaking






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






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






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






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






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






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






24. Materials that can plastically deform without breaking






25. The study of crack growth leading to material failure






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






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






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






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






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


31. 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






32. 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






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






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






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






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






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






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






39. 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






40. 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






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






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






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






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






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






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






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






48. Failure because of repeated stresses bellow the yield strength






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






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