Breaking Stability
Analysis of fiber strain based on pulling test
Extrapolation until the limit of elasticity
The fracture safety determination estimates the load-bearing capacity of the trunk from the results of the tensile test and compares it with the expected wind load.
Statistical evaluation of the measured data
In a tensile test, fiber elongation is measured under a defined load using high-precision strain gauges (elastometers) and load cells (dynamometers). Arbostat determines the best linear correlation from force-strain values and evaluates the quality of the measurement result using statistical parameters. Deviations from the expected deformation are analyzed and interpreted with regard to the condition of the wooden body.
Prognosis of deformation with pulling test
According to Hook's law, ArboStat extrapolates the measured elongation up to the yield point of the green wood. Several catalogs with tree species-specific guide values are available for this purpose. The limit value is defined as the point at which the deformation is no longer elastically reversible and the fibers are permanently deformed and thus damaged.
Measuring results and evaluation at one glance
The measured force-strain values and the resulting equalization line are shown in a diagram. As this straight line represents the behavior of the edge fibers under load, the failure load can be read from it. The course of the straight line thus represents the safety margins against breakage.
