Wood Technology department of the Technical University of Munich is providing the named subject in the form of a master thesis.
Description
Wood is a bio-material with anisotropic and non-homogenous material properties. Damage in wood can happen due to several reasons, including the drying effects, and accumulation of the stresses on the location of joints. Due to orthotropy of this material, different damage parameters should be considered for wood to cover failure of this material both under tension as well as under compression. Damage of wood is ductile under compression and brittle or quasi-brittle under tension and shear. The purpose of this thesis is to enhance failure modes for damage initiation. Different criteria need to be taken into consideration, implemented as user-defined material models in the computational software Abaqus to be investigated on specific benchmark problems.
The following points should be satisfied during the thesis:
- Literature review on different failure criteria for damage initiation in the composite materials and wood
- Implementation and further developement of user-defined material models (UMATs) in Abaqus
- Investigation of UMATs on benchmark problems
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Damage propagation
Language: English, Thesis available from September 2021
Supervision and further information: Franziska Seeber, Ani Khaloian, Prof. van de Kuilen
Holzforschung München of the Technical University of Munich offers a graduation thesis on the above-mentioned topic.
Mechanical properties of sawn timber depend on various factors such as tree species, forestry or technical processing. The dimensions of wood have a significant impact on the mechanical properties. For softwood, the correlation of wood volume and strength have been most widely researched, for hardwood though, there is still a lack of knowledge.
This work examines the volume effect for hardwoods. For this purpose, the strength properties of specimens with various lengths and qualities are analyzed and a mathematical model is developed.
Tasks in detail:
- Literature review on the volume effect.
- Evaluation of the test results.
- Clear presentation and discussion of the results.
Bachelor thesis or master thesis
The results of the work shall be presented at the seminar of wood science at Holzforschung München. Duration: 30 minutes
Supervision & contact: