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 ratio of applied load to cross - sectional area






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






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






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






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






6. 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






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






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






9. 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






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






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






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






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






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






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






16. The ease with which a material deforms without breaking






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






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






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






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






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






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


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






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






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






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






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






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. 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






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






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






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






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






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






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






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






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






38. Failure because of repeated stresses bellow the yield strength






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






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






41. The study of crack growth leading to material failure






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






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






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






45. 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






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






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






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






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






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