Schmidt, Jonas
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Schmidt, Jonas
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Schmidt, Jonas
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Item-typ:Veröffentlichung, An investigation of crack propagation in an insect wing using the theory of critical distancesMaterials often have toughening mechanisms at different length scales. An interesting example is the insect wing, which consists of a membrane and veins. Previously we showed that cracks tend to arrest at the veins, which confer an increased toughness compared to that of the membrane. The Theory of Critical Distances (TCD) is an approach used to predict crack propagation based on the concept of a material-dependant length scale. In the present work, we monitored cracks propagating through wing samples and used finite element analysis (FEA) to model the interaction between cracks and veins. We found that the TCD could accurately predict the passage of a crack through a vein based on an estimate of the average stress over a material-dependant distance ahead of the crack tip. A picture emerges of the wing as a material with toughening mechanisms on two length scales: membrane level (critical distance 0.17 mm) and vein level (critical distance 0.58 mm). This work provides insights into how natural materials achieve enhanced toughness and could have applications as a concept in engineering design.Wissenschaftlicher ArtikelBand:232187 - Some of the metrics are blocked by yourconsent settings
Item-typ:Veröffentlichung, Improving Material Property Understanding with Virtual Experiments: A New Approach to Teach About Mechanical Testing of Materials Using an Interactive Desktop AppThe knowledge of the mechanical properties of polymers and other materials is essential for several tasks in the field of materials science, like component design and material development. The tensile test is one method of determining many of the material’s most defining mechanical characteristics. However, the teaching of laboratory experiments can be difficult when it needs to be incorporated into online-based education. This study presents a teaching concept that leads students on an online learning platform through the execution of the tensile test with educational videos, handouts, and an interactive desktop app. The app allows to simulate tensile tests of currently 79 materials at various testing temperatures and to compare their properties. Students can learn from exploring the different materials and are also able to extend the app’s database for their personal use. Learning progress was evaluated with tests before and after the teaching unit, which significantly increased the achieved score afterward. Further results from a survey of the participating students indicate that they appreciate the online-based teaching concept and that the prepared learning tools motivated them to deal with the subject matter.Wissenschaftlicher ArtikelBand:99Heft:2112