Refine
Year of publication
Document Type
- conference proceeding (article) (30)
- Article (22)
- Report (8)
- Part of Periodical (5)
- Patent (2)
- conference proceeding (presentation, abstract) (1)
- conference talk (1)
- Doctoral Thesis (1)
Is part of the Bibliography
- no (70)
Keywords
- Forschung (3)
- Forschungsbericht (3)
- Analytical modelling (1)
- Barely Visible Impact Damage (1)
- Belastung (1)
- Bending model (1)
- Carbon Fiber Reinforced Plastic (1)
- Composite (1)
- Curved composite (1)
- Cylindrical coordinate system (1)
Institute
- Fakultät Maschinenbau (65)
- Labor Faserverbundtechnik (LFT) (63)
- Technologie-Campus Neustadt an der Donau (52)
- Fakultät Angewandte Natur- und Kulturwissenschaften (7)
- Hochschulleitung/Hochschulverwaltung (5)
- Institut für Angewandte Forschung und Wirtschaftskooperationen (IAFW) (4)
- Labor Biomechanik (LBM) (3)
- Regensburg Center of Biomedical Engineering - RCBE (3)
- Sensorik-Applikationszentrum (SappZ) (3)
- Labor Mikrosensorik (2)
Begutachtungsstatus
- peer-reviewed (8)
Forschung 2019
(2019)
Following a ban on many materials containing bisphenol-A, new bisphenol-free Boron silicates have been found as substitutes. The purpose of this study is to describe the mechanical properties of these bisphenol-free magnetoactive borosilicate polymers containing hard magnetic particles. Samples of 0%, 33% and 66% by wt. were loaded for compression using a universal testing machine. The maximum forces occurring for different travel speeds were compared before and after post-magnetization treatments. The post-magnetization included 2 stages. In addition, the change in mechanical properties within 24 hours after the post-magnetization process was investigated. Furthermore, the influence of speed and particle content were investigated. In general, there is a correlation between the required compressive force and, the level of post-magnetization stress, the increase in travel speed and particle content in the boron silicate. Comparison of the non-post-magnetized and post-magnetized samples using two-tailed t-tests shows that the p-values for all weight fraction changes in NdPrFeB particles and travel speeds are less than 0.001. Also, a comparison between tests in which the traverse speed was varied also showed significant changes in the resulting compression forces. The same is valid for changes in the weight ratio of the NdPrFeB particles in the samples. For post-magnetized samples, no significant difference can be observed in the first 24 hours following magnetization. In summary, the material presents viscoelastic, plastic force-displacement behavior, which can be well recognized by its bi-linear curve shape.
The investigation shows that borosilicate polymers based on NdPrFeB can have their mechanical behavior modified and controlled by post-magnetization processes. This opens new possibilities for many future applications.
Investigation of Bolted Composite Joints with Different Reinforcement Elements at the Bolt Hole
(2014)
Forschungsbericht 2013
(2014)
The aim of this study is to compare two different standardized testing procedures, tensile testing and Mode-I double cantilever beam (DCB) testing, to evaluate a possible correlation between the dominant failure in glass fibre-reinforced plastics and their according acoustic emissions (AE). AE is processed by using a burst collection of all recorded transient signals and is further analysed with the k-means clustering algorithm. To generate damage related AE, a series of experiments for tensile testing and Mode-I DCB testing is performed on 16-layer glass fibre/epoxy specimens with a cross-ply lay-up for tensile and an unidirectional lay-up for Mode-I DCB testing. Three sensors at tensile testing and one sensor at Mode-I DCB testing gather AE data. The results of clustered burst signals show a good accordance between both testing procedures, with a similar weighted peak frequency (WPF) range in each classified cluster. In total, three different clusters are determined. An assignment of these three clusters to the three dominant damage mechanisms, visually observed by microscopy, is suggested.
Analysis of the Acoustic Emission Failure Frequencies of Glass Fiber Reinforced Composite Components
(2017)
Forschung 2018
(2018)