Lab 5 and 6.pdf | bartleby

CEE 300/TAM 324: Lab 5&6 Impact testing and Fracture toughness Lab section: Student name: General note: Use space as needed. The answer length is not suggested by the space. All equation numbers listed are from the respective lab in the lab manual. Q1. (6 pts) Complete Table 1. Impact testing Plate penetration Table 1—Plate-penetration data (Polymers) Measurement or property Material Name Symbol Units PMMA ABS Specimen dimensions and impact parameters Specimen shape — — Plate Plate Clamp diameter 2 a mm 76 76 Specimen thickness h mm 2.89 3.08 Crosshead height H m 760 930 Crosshead weight W N 61.8 61.8 Avail. energy (theor.) WH J 46968 57474 Measurements of time to failure, maximum load, and energy absorbed Environment Tim e t fail (mse c) Max . load P (kN) Total energ y Γ (J) Tim e t fail (mse c) Max . load P (kN) Total energ y Γ (J) Freezing water (0 °C) Impact data 1.6 0.532 1.56 5.78 1.16 14.3 Description of fracture surface Cracks on fracture surface, completely shattered Cracks on fracture surface, Room temperature ( °C) Impact data 2.9 0.640 3.91 5.44 1.12 12.9 Description of fracture surface Cracks on fracture surface Cracks on fracture surface

Boiling water (100 °C) Impact data 8.88 3.03 43.7 7.52 2.15 34.1 Description of fracture surface Plastic deformation before failure Plastic deformation before failure

Q2. (9 pts) For each polymer tested, plot the values of maximum load and total absorbed energy as functions of test temperature. Then extrapolate the plot to -50 and 150 ºC and show the probable dependence of maximum load and total absorbed energy on temperature. The extrapolation should reflect the observed changes in energy and the expected glass transition behavior of the material. Keep in mind that the minimum value of energy that can be absorbed is zero, and the maximum value is the initial potential energy WH of the impactor, which can be calculated from the data in the header file. When extrapolating to -50 and 150 ºC, the energy should be within these bounds. PMMA: Figure 1. Maximum Load vs Temperature (Plate Penetration): PMMA Figure 2. Total Absorbed Energy vs Temperature (Plate Penetration): PMMA

ABS: Figure 3. Maximum Load vs Temperature (Plate Penetration): ABS Figure 4. Total Absorbed Energy vs Temperature (Plate Penetration): ABS

Charpy impact Q3. (6 pts) Complete Table 2. Table 2—Charpy impact data Measurement or property Material Name Symbol Units 1045 HR Steel 6061 Aluminum Specimen dimensions and impact parameters Anvil Spacing L mm 40 40 Depth D mm 9.37 9.44 Width w mm 7.62 8.39 Notch depth d mm 7.06 7.06 Notch root radius r mm 0.095 0.095 Crosshead height H m 738 758 Crosshead weight W N 125 125.2 Avail. energy (theor.) WH J 92250 94901.6 Measurements of maximum load and energy absorbed Temperature T Max. load (kN) Energy (J) Max. load (kN) Energy (J) Freezing water (0 °C) Impact data 12.1 5.12 7.10 13.5 Description of fracture surface Shear lip at fracture surface Shear lip at fracture surface Room temperature ( °C) Impact data 16.7 8.41 6.78 12.6 Description of fracture surface Shear lip at fracture surface Boiling water (100 °C) Impact data 13.1 23.4 6.79 11.2 Description of fracture surface Shear lip at fracture surface Shear lip at fracture surface

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