Fraunhofer Chalmers Research Centre for Industrial Mathematics
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Virtual durability testing of CFRP materials
No full textThe demand for products made from carbon fibre reinforced polymers (CFRP) is rapidly increasing. As in the car industry where there is a need for more lightweight
and energy efficient solutions to lower the environmental effects. The new Polestar 1 car is an example where CFRP has been introduced in several parts of the car body.
When usage increases, it also becomes more important to understand the properties of the material. To lower the costs of material tests, this project has developed
a test methodology detailing the way to perform virtual material tests at Volvo Cars. The first part of the project covers unidirectional (UD) plies which are stacked together into laminates with fibre orientations at different angles. A 3D physically based constitutive material model, called LaRC05 which was developed by Pinho, Iannucci, and Robinson (2006a), is used in the project. This model proved to be one of the more accurate material models during the second World Wide Failure
Exercise (Kaddour and Hinton, 2013). Later in the project, a strategy to model more complex fibre architectures and to transform the model into different test environments is proposed.
The developed methodology reduces the number of physical laminate tests and shows good correlation towards physical tests in room temperature environment. It can
predict the strength at first sign of failure and models the same failure mode that can be seen in physical tests. Further work has to be performed on how to predict failure in hot and wet test environments. For cold environments it is recommended to look closer on compression tests while tension tests show a good correlation. Weak areas of the methodology are discussed together with possible actions of improvement
On-line algorithms for detecting and isolating electrical errors in high-voltage battery packs
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Grundvattenankare
No full textThis report aims towards developing a convenient shallow water anchor whilst keeping the costs down. The anchor is supposed to fit leisure boats with a length up to six meters long, in depths of maximum five meters. The current market for those types of anchors are growing
but most of the products are very expensive.
With a market evaluation and a poll, the current market is analyzed to see if there are any ideas that could be implemented into the new concepts. The newly generated concepts are later screened to decide what concept to build upon. With the concept choice made, much
effort goes into product development with choices of materials, dimensions and design to make the product attractive. Some FEM-analyzes has been performed to see how the product cope with different loads. The project has mainly been performed in Conmore’s headquarter,
with the main question; can a shallow water anchor be developed that is very convenient but not as expensive as the ones already on the market
Bankpålning och kalkcementpelare - En teknisk, ekonomisk, och miljömässig analys och jämförelse
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