Abstract
Two groups of small-size single edge notched beams (SENB) made of European spruce (Picea abies) were tested in three-point bending (3PB) until failure under displacement control. The first group comprised of eight solid and two glued laminated (GL) timber beams manufactured with (a) the single edge notch at the bottom of the mid-span and (b) the reduced ligament depth. The second group consisted of four GL timber beams with the single edge notch only. We employed digital image correlation (DIC) to quantify strains and displacements, capture the damage evolution, and track the sequence of failure patterns. In this work, we present response of the beams in terms of load vs. crosshead displacement of the moving crosshead and load vs. crack tip opening displacement (CTOD).
Highlights
An experimental campaign has been carried out at Czech Technical University in Prague to determine both the response and the damage evolution of single edge notched beams (SENB) with fibers along the beam length
The second group consisted of four glued laminated timber beams with cross-section width w of 4 cm
Let us note that the failure of fibers crushing due to compression stress perpendicular to the grain around the loading plate and supports is present in every beam influencing the response
Summary
An experimental campaign has been carried out at Czech Technical University in Prague to determine both the response and the damage evolution of single edge notched beams (SENB) with fibers along the beam length. The first group beams were sawn with the notch and an reduced ligament depth to induce the fibers rupture (splinter) under tension stress parallel with the grain at or close to the ligament. In the midspan zone (Figure 2), the tension stress leads to fibers rupture that we can categorize as a brittle failure. Load-bearing capacity of a beam in bending is usually limited by the brittle behavior of timber in the tension zone and can be more reduced with the presence of natural defects. The area of a support or a loading point is typical for compression stress perpendicular to the fibers that leads to a ductile failure (Figure 4)
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