Abstract
In product design, the focus is increasingly shifting towards optimizing and increasing the efficiency of the development process. This can be achieved with advanced numerical tools, but these methods require precise knowledge of material properties. One of the desired properties is the dynamic load behavior of the material. The research is directly related with the company that developed the slender wooden beams used in industry to produce windows of larger dimensions (height over 3 m). For the testing of wooden beams, the pneumatic four-point bending fatigue test rig was developed. In this paper, the whole structure of the test rig is described in detail. Based on the performed experiments of dynamic strength, the Woehler curve was determined, which serves as a necessary input for further numerical simulation of the fatigue process of wood-based beams. Knowledge of the response of wood to dynamic loads is very important to predict its life expectancy in various products.
Highlights
When designing parts and structures, various physical models must be taken into account, which can lead to damage, failure or collapse of a part or an entire structure
Basic guidelines for the design of the test rig construction are the requirements of the selected company producing wooden windows (M SORA d.d., Žiri, Slovenia) for the length of the test beam
After several months of operation of the test rig, it can be determined that the system works reliably and robustly
Summary
When designing parts and structures, various physical models must be taken into account, which can lead to damage, failure or collapse of a part or an entire structure. The collapse of a part can be caused by a sudden overload (resulting in an impact fracture) or by a regular or continuous change of stress at lower levels under the influence of dynamic stress, which after a certain time leads to fatigue and, permanent fracture. Repeated loading causes permanent deformation, cracks and fractures even at stresses of lower levels, which would not lead to permanent deformation under static loads. The dynamic strength depends on the type of load and the number of load oscillations It is determined experimentally by dynamic testing of specimens in special test rigs for fatigue tests. The test results are shown in σ–N (S–N) diagrams in the form of the number of load cycles N until the occurrence of a crack or a fracture in a curve of the dynamic strength of the material (S–N curve, Woehler curve)
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