Abstract
In this chapter, the theory of LEFM and the special application of LEFM on wood are introduced. Then, different samples and methods are applied to measure the Mode I fracture toughness of wood along grain, and the results show that the fracture toughness of wood along grain is the basic attribute of wood and has nothing to do with test method, geometrical shape, and size of crack. The research indicates that LEFM based on isotropic body is applicable to the crack propagation of wood along grain. And based on energy theory, double cantilever inversion symmetry bending load method is applied to measure the Mode III fracture toughness of spruce. The results show that the average Mode III interlaminar fracture toughness 1.05 kJ/m2 can be seen as a basic attribute of spruce that represents the capacity of spruce to resist the propagation of Mode III crack.
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Shao, Z., Wang, F. (2018). Fracture of Wood Along Grain. In: The Fracture Mechanics of Plant Materials. Springer, Singapore. https://doi.org/10.1007/978-981-10-9017-2_3
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DOI: https://doi.org/10.1007/978-981-10-9017-2_3
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