The fracture behavior was determined for three polymeric films which are used for magnetic media and other applications. Both fracture initiation and propagation were characterized by a specialized video-based real-time film fracture technique. The toughness of each of these films was evaluated from the fracture mechanism and material properties of the films. The results showed that a material's resistance to crack propagation is not proportional to its resistance to crack initiation; and the stress associated with the crack initiation is usually smaller than the maximum stress.
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