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(Solved): SUBJECT: Polymer material Table 3 shows the data obtained from an instrumented impact test co ...



SUBJECT: Polymer material

Table 3 shows the data obtained from an instrumented impact test conducted on polypropylene (PP) at \( 20^{\circ} \mathrm{C}

Table 3 shows the data obtained from an instrumented impact test conducted on polypropylene (PP) at . Table 3: Fracture energy of PP obtained from impact test (a). Calculate the values of fracture toughness under both plane strain and plane stress conditions. (c). The fracture toughness values dropped further when the experiment was repeated at . Proof quantitatively that the plastic zone effect is affected by the changes in the testing temperature. (d). How the toughness of PP samples can be improved at ? State clearly any assumption made in your calculation.


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a) Fracture toughness under plane strain condition can be calculated using the following equation:KIc=2WBawhere W is the fracture energy, B is the wid
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