Pentti O. Kettunen's Advances in Materials Science of Wood PDF

By Pentti O. Kettunen

ISBN-10: 0878493549

ISBN-13: 9780878493548

ISBN-10: 3038132608

ISBN-13: 9783038132608

ISBN-10: 3908453089

ISBN-13: 9783908453086

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Al. /28/). As the figure illustrates, the effect of the deviation angle is of similar type as that mentioned earlier in the case of elastic/anelastic properties. The deviation angle does not influence only the elastic/anelastic and strength properties, but also the occurrence of fracture. Already a deviation angle of 5 degrees causes the fracture to assume the mode of shear fracture, and a deviation angle over 25 degrees makes the fracture to proceed between the macrofibrils (see Fig. 34). Both of these cases favor the fracture by the mechanism of splintering In this publication, Professor Müller in his article describes, among other things, the interrelationships between the microfibril angle (MFA) and applied external stress.

The table presents the nominal axial fracture strength (ultimate tensile strengths, UTS) values as measured on small faultless samples at room temperature and at the moisture content of about 15 %. The measurements of pure shear strength values require specimens of a special kind, and they are normally different for the measurements along or across the reinforcing fibers. The shear strength of a fiber-reinforced material is at minimum in the direction where plastic deformation and fracture are capable of propagating in the matrix between the reinforcing fibers (cf.

This is understandable, as the constituents of wood in amorphous as well as in semi-crystalline state are non-cross-bonded thermoplastics, not cross-bonded thermosets. Most notable features typical for polymers are anelasticity (visco-elasticity), sensitiveness to creep and fatigue, and the rather strong dependence of properties on temperature. In wood additional is the strong dependence of mechanical properties on the moisture content. In the following, these properties are reviewed first briefly in the elastic region and then more thoroughly in the plastic region, in the latter region, however, only under monotonic short-term loading.

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Advances in Materials Science of Wood by Pentti O. Kettunen

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