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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. 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






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






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






19. 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






20. Failure because of repeated stresses bellow the yield strength






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






22. 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






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






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






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






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






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






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






29. The ease with which a material deforms without breaking






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






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






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






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






34. 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






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






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






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






38. 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






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






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






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


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






43. Materials that can plastically deform without breaking






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






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






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






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






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






49. The study of crack growth leading to material failure






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