Abstract
The currently pursued implementation of wood into novel high performance applications such as automotive parts require knowledge about the material behaviour including ultimate strength. Previous research has shown that fiber deviation seems to be the dominating factor influencing the strength of thin veneers. This study aims to further investigate and quantify the influence of fiber deviation in two dimension and different hierarchical levels on the tensile strength of thin birch veneers. The fiber deviation in- and out-of-plane as well as the micro fibril angle were assessed by means of wide-angle X-ray scattering. Tensile strength was determined in laboratory experiments. Results show a high variability for in-plane fiber deviation mainly constituted by knots and other growth influencing factors. Pearson correlations between strength and fiber deviation ranged from −0.594 up to −0.852. Best correlation (r = −0.852) was achieved for maximum in-plane fiber deviation directly followed by a combined angle of in- and out-of-plane fiber deviation (r = −0.846). Based on the results it was shown that fiber deviation in- and out-of-plane is the dominating factor influencing ultimate tensile strength of thin birch veneers. Further research in regard to non-destructive strength prediction is necessary.
Highlights
The successful implementation of wood into high performance fields of application such as the automotive industry requires knowledge about the mechanical behaviour of the material on a piece by piece basis [1]
Recent literature on strength prediction based on fiber deviation deal with solid wood [8,9,10], Engineered
The present study aims to further investigate and quantify the influence of fiber deviation on tensile strength of thin birch (Betula pendula Roth.) veneers with a thickness of one millimetre or less
Summary
The successful implementation of wood into high performance fields of application such as the automotive industry requires knowledge about the mechanical behaviour of the material on a piece by piece basis [1]. This includes information about the elastic properties and ultimate strength [2]. To gain information about the mechanical properties of wood on a piece by piece basis different non-destructive techniques have been established already [3,4]. Recent literature on strength prediction based on fiber deviation deal with solid wood [8,9,10], Engineered
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