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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?C. 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 ?40?C. 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 ?40?C ? State clearly any assumption made in your calculation.