Micromechanical Study Of Green Wood
Subjected To Mode I Fracture
Author(s)
S. Vasic & S. Stanzl-Tschegg
Abstract
The importance of environmental effects on the structural performance of wood
has been known for ages, moisture being the most pronounced degradative effect
that needs to be taken into account at different levels of wooden structure
durability. Moisture content has an effect on many mechanical and physical
properties below the fiber saturation point. The results presented herein focus on
the chracterisation of fracture mechanisms and properties of softwoods and
hardwoods at the highest moisture content around the fiber saturation point,
where wood can be regarded as a poroelastic fluid-saturated media. Small
wooden specimens were subjected to opening fracture mode I loading with the
wedge-splitting loading stage which allows for in-situ real-time ESEM
investigations. Fracture responses are reported for four different wood species
tested ex situ, and fracture parameters such as total fracture energy are discussed
related to two fracture directions RL and RT. It is concluded that micro-study
provides valuable evidence on the change of fracture mechanism with wood
species and fracture orientation.
Keywords: wood, fracture, ESEM, moisture, poroelasticity, fluid-saturated
media, crack.
1 Introduction
In the living tree, wood contains large quantities of water. As green wood dries,
most of the water is removed. The moisture remaining in wood tends to come to
equilibrium with the relative humidity of the surrounding air. Moisture moves by
Keywords
wood, fracture, ESEM, moisture, poroelasticity, fluid-saturated
media, crack.
Related Book
Other papers in this volume
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