Researchers at the Institute for reliability and structural durability of the Fraunhofer system in Germany issue a lightweight horizontal lever for intermediate-level vehicles. The component is made of carbon fiber material, and the weight is reduced by 35% compared with the similar members of steel. In addition, the researchers plan to integrate a variety of functions into the transverse levers to achieve higher fault tolerance and ease of use.
For this purpose, the researchers used structural health monitoring System (SHM) and semi-active systems for reducing solid sound propagation in the components.
It is a great challenge for designers to ensure that the design of the fiber composite structure conforms to the fiber characteristics and ensures the safety and reliability of the components in use. Compared with metal, the behavior of fiber composite under load is more complicated, so it is not easy to replace metal structure with fiber composite structure. Considering the processing technology and the reasons of the anisotropy of the fiber composites, different approaches should be adopted for different materials in the design.
Fiber composites must be designed to conform to the characteristics of the fibers, so these reinforced fibers must be arranged in a neat direction.
Tension on the "left brake" of the transverse lever in the load situation A challenge for Damsdat researchers is to make fiber-reinforced composite components suitable for mass production. The results show that the organic slab with thermoplastic matrix is especially suitable for the manufacture of large and type components. The material is molded into the mold according to the shape of the component.
Based on the matrix system of thermosetting plastics, the resin transfer molding method can be considered to process the components. LBF researchers stressed that to design a stable and reliable chassis parts, you need to take into account all parts of the operation related to the impact factors. The load design of the component is based on the load set of the measuring wheel obtained in a driving cycle. These numerical groups are converted into external forces that are subjected to each component. The critical driving behavior is derived from driving behavior, and these thresholds are used as assumed loads.
According to the researcher's further explanation, different driving behavior in the highest load of the region caused by the complex multiaxial load state, considering the safety of driving, it is necessary to evaluate these states.
Optimized cladding structure The researchers carried out experimental studies on the materials used, constructed the material model base based on the research results, and evaluated the life expectancy accordingly. With the help of digital simulation method, the researchers identify various load areas, and the fiber reinforced materials in the structure need to change according to the load direction. The research shows that in order to support the local fiber reinforcement, the braided layer needs to adopt the coating structure.
In order to fit the optimum stress load of the braided layer, the deposited structure is numerically optimized according to the local fiber direction.
Light reveals damage A high load situation can damage the structure of the component and shorten the life of the component, such as traffic accidents or overloading of roads with poor road conditions. With the help of a structural health monitoring system consisting of fiber optics sensors and optical cables, researchers can monitor these damaged areas online. When a crack is created in the monitored area and the damage becomes heavier, the deformation of the area intensifies, and the fiber optics sensor captures the changes.
When the minimum value is exceeded, the driver gets the appropriate alert display.
damped Vibration in fiber composite Lightweight structures that withstand dynamic loads are prone to vibration, usually using devices such as shock absorbers to reduce vibration. The disadvantage of adopting this method is that it requires additional weight and space. To this end, researchers at the Fraunhofer LBF Institute integrated the damper by using a piezoelectric converter that uses a passive component wiring. The principle is to use the inductive circuit and the converter as the resonant circuit, thus replacing the mechanical shock absorber.