, Volume 8, Issue 11, pp 1581-1589

Fracture behaviour of boron filaments

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Various types of boron filaments were broken in tension in such a way that primary fracture surfaces, and fragments ejected when fracture occurred, were retained. Fracture surfaces observed in the scanning electron microscope could be placed into one of two broad categories. Type I surfaces exhibited primary fracture characteristics such as mirror, mist and hackle zones. Flaws which initiated failure could frequently be resolved. Type II surfaces appeared to be generated by subsequent fracture immediately following primary failure. The relationship between the fracture surfaces and the stress distributions occurring within the fibres as a result of manufacturing conditions is discussed.