A5046918487- Advanced Welding Techniques Analysis
- Metal Forming Simulation Techniques
- Mechanical stress and fatigue analysis
- Mechanical Behavior of Composites
- Metallurgy and Material Forming
- Structural Load-Bearing Analysis
- Aluminum Alloys Composites Properties
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Advanced machining processes and optimization
Paderborn University
2018-2024
Shanghai Jiao Tong University
2024
Mechanical joining technologies are increasingly used in multi-material lightweight constructions and offer opportunities to create versatile processes due their low heat input, robustness metallurgical incompatibilities various process variants. They can be categorised into which require an auxiliary element, or do not element. A typical example for a mechanical with element is self-piercing riveting. wide range of exist requiring This allows both point-shaped (e.g., by clinching)...
Shear-clinching is a method for joining of dissimilar materials without auxiliary element. The technology combines shear-cutting and clinching in one process. Challenges the process are deformation specimens high forces, which lead to tool loads. Thus, influence punch-sided geometry on multi-element was tested experimentally within this study. effect geometrical changes occurring loads analysed with numerical model order evaluate benefit adapted design regard lifetime toolset.
The newly developed joining-by-forming technology “shear-clinching”, features a potentially single-stage process for joining UHSS without requiring any additional elements. Foundational studies have focused on the functionality of shear-clinching at one-element sample. To ensure safety industrial application technology, an investigation with component-like samples several joints is required. This paper presents detailed analysis material behaviour during multi-element specimens to evaluate...
Modern developments in the automotive sector are motivated by objective of lowering emission pollutants. In contrast, growing demands for safety and comfort lead to a potential increase weight vehicles. Thus, consequent use lightweight design is indispensable. This includes different materials construction car bodies. Because various material properties, joining dissimilar challenging requires often application non-thermic processes like riveting or clinching. These limited mechanical...
Abstract The compliance with increasingly stricter emission standards is a challenge for the automotive industry, which requires utilization of lightweight materials e. g. aluminium and high‐strength steels. Hereby, load‐optimized design body parts reduction wall thicknesses are enabled. But, due to use dissimilar materials, common joining technologies reaching their limits. On one hand, by welding often not possible because different melting temperatures. other forming additional fasteners...
For the mechanical joining of aviation-grade aluminum alloys, study introduces an innovative approach using self-punching lockbolts. This method involves utilization a profiled collar and specially designed bolt to seamlessly join EN AW-2024 T42 sheets, up thickness 8.0 mm, without need for pre-holes. In this process, when sheets are punched, undergoes slight deformation, effectively functioning as die. Subsequently, is systematically formed by applying increased force. By fine-tuning design...
The extensive use of carbon fiber-reinforced composites and aluminum alloys represents the highest level automotive body-in-white lightweighting. effective secure joining these heterogeneous materials remains a prominent actively researched topic within scientific community. Among various techniques, clinching has emerged as particularly cost-effective solution, experiencing significant advancements. However, application is severely limited by properties materials. In this work, processes...
The influences in the experimental investigation are divided into geometry of specimen and corrosion phenomenon. 8-element specimens were joined with various overlaps form a single lap shear load multi-element specimen. Afterwards, segmented one-element specimens, which tested under quasistatic order to detect possible geometry. effect on load-bearing capacity was investigated same according VDA 621-415. In addition, two arrangements protection generated guarantee joint quality corrosive...
The multi-material design of modern cars is a challenge for common joining technologies. Joining by welding often not possible, due to different melting temperatures the partners. Indeed, usage fasteners allows forming high-strength steels with aluminium, but increases weight and costs. Common technologies without additional are limited mechanical properties Thus, clinching ultra-high strength low ductility, like press-hardened manganese-boron steels, possible. However, innovative...
Three-dimensional modelling enables to determine the in-plane material flow in asymmetrical situation. Thus, distortion of sheets be joined can characterized more exactly. This study shows a method for building up three-dimensional shear-clinching framework without damage criteria. In fact, die-sided sheet was designed as pre-punched and slugs. The separation joining partner, which two-dimensional simulation is often described by macro- micromechanical fracture criteria, realised this based...