Abstract
This article deals with a new original analytical solution of deformation, force and stress states in wood screw joints up to the limit values of pulling out/breaking the screw. The screws are under tension. The wood-to-screw interaction is effectively simplified by introducing several physical model variants using a tangential elastic non-linear foundation. The experimental verification of the proposed models using pull-out tests (i.e., pulling out screws from dry spruce wood in laboratory conditions) confirms the correctness of the proposed models of the elastic linear/non-linear foundation. The validity of the model is also analytically and experimentally verified in the biomechanical model of pulling out screws from the femur of a bovine/human cadaver, which confirms and expands the validity of newly designed screw joint models outside the timber structure area.
Highlights
This article deals with a new original analytical solution of deformation, force and stress states in wood screw joints up to the limit values of pulling out/breaking the screw
It is surprising that screw joints even occur naturally in some biological tissues, e.g., coxa–trochanteral joints on the legs of the weevil Trigonopterus oblongus
The problem of several variants of the geometrical and material design of screw joints in the wood was solved in an analytical way by means of a newly designed tangential model of an elastic foundation
Summary
This article deals with a new original analytical solution of deformation, force and stress states in wood screw joints up to the limit values of pulling out/breaking the screw. Important applications of screws are found in surgery and in the treatment of complicated fractures and deformities of humans/animals in traumatology/orthopaedics (external and internal fixations in osteosyntheses, etc.) (see Figure 1c and, for example, references [12,13,14,15,16,17,18,19,20,21]). The hips of weevils do not consist of the usual hinges, but of “unknown” joints based on a screw-andnut system. This “unusual” biological screw thread is about half a millimeter in size (see references [22,23]). “similar” applications are found in wooden structures (see [1,4])
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