Discussion : 1. What are the uses of the impact test? 2. What is the difference between Charpy and Izod Impact tests? Which one is preferred in each case? 3. Discuss the significance and advantages of impact tests compared with static loading tests.
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- What are the differences between torsion and tension tests?In what situations would you use a hardess test instead of a Tensile test?a What is the difference between vicker hardness test and brinell hardness test based on load ,indenter , accuracy ? b . what is the meaning of toughness in material science ? c . the toughness of material is affected by what ? d . what is the difference between tensile test and impact test?
- Write a note on toughness mechanism in brief. What is the standard size of square and round test specimen? Which property of material can be determined by impact test? Why friction loss test is conducted in impact test experiment? What is the difference between charpy impact test and izod impact test?Given your understanding of what initiates and controls failure in materials, which of the following will reduce the failure strength or lifetime of a test piece and why? a. (more than one answer is possible for this question. marks will only be awarded for the question if all the correct options are selected (i.e. 'all or nothing' marking scheme). b. LUS C. d. Increasing its volume, greater likelihood of critical defects Decreasing the loading frequency, the material will be at peak stress values for longer Decreasing the grain size, more grain boundaries to initiate failure Increasing the difference between the maximum and minimum stress values, as this affects the stress concentration factor Recent M Raising the temperature above the BDTT, more plastic deformation in the lattice will cause it to fail faster GHardness tests are performed more frequently than any other mechanical test for several reasons: (Choose all that apply): Other mechanical properties can be estimated from hardness data such as tensile strength The test is simple and inexpensive The test is nondestructive, which means that the specimen is neither fractured or excessively deformed after the test Testing apparatus is relatively expensive
- Question One a) In a tensile test, material mechanical properties are determined by relating deformations to the applied forces. i. Sketch a typical specimen used in such tests and on it indicate two important dimensions i Sketch the difference you would cxpect in tensile and compressive deformations Sketch a stress-strain curve/graph you would expect from such a test and on it indicate how you would obtain (1) Young's modulus, E(2) clastic limit,oei(3) yield strength ay and (4) ultimate tensile strength duTS ii. b) In such a test, as the one in (a) above, a specimen manufactured from steel, and had an original diameter of 12.8 mm and gauge length of 50.8 mm. The resulting data, stress and strain, is listed in the table below. Strain 0.007 0018 0.032 005 0 052 0.056 0.06 0.005 0072 0.076 011 0.15 017 022 024 (m/ m) Stress 80.8 218 390 540 600 630. 650 640 634 643 745 851 885 815 770 (MPa) By plotting stresses on the vertical axis and strains on the horizontal axis, plot a stress-strain…Discussion / 1-What is hardness and what is the benefit of calculating it? 2- Classify the materials that have the highest hardness? 3-What does the change of metal type of Brinell ball depend on? 4-What are the means of developing a Brinell test device from your point of view? 5-How does the accuracy of the results in the experiment depend ? V jjo VI. List the importance of the impact test and limitations. II. Which material (i.e., C1045-CF, Cast Iron, AL7075-T6) was more ductile? Explain the effect of carbon content and finishing process on ductility. II. How did temperature affect the toughness of the specimens? IV. Based on these results, which material would be better to use for constructing an earthquake resistant structure? Explain. V. The following picture shows Charpy fracture surfaces of a material with different initial temperatures, after testing. Which of these figures, i.e., (a) to (e), is related to the lowest temperature? Explain. (d)