No abstract

Numerical mechanical models used for design of structures and processes are very complex and high-dimensionally parametrised. The understanding of the model characteristics is of interest for engineering tasks and subsequently for an efficient design. Multiple analysis methods are known and available to gain insight into existing models. In this contribution, selected methods from various fields are applied to a real world mechanical engineering example of a currently developed clinching process. The selection of introduced methods comprises techniques of machine learning and data mining, in which the utilization is aiming at a decreased numerical effort. The methods of choice are basically discussed and references are given as well as challenges in the context of meta-modelling and sensitivities are shown. An incremental knowledge gain is provided by a step-bystep application of the numerical methods, whereas resulting consequences for further applications are highlighted. Furthermore, a visualisation method aiming at an easy design guideline is proposed. These visual decision maps incorporate the uncertainty coming from the reduction of dimensionality and can be applied in early stage of design.

Carbonbeton rückt immer mehr in den Fokus von Planern, Architekten oder Bauherren. Dies begründet sich in den Vorteilen des Baustoffs, wie der enormen Beton-und Ressourcenersparnis oder der Möglichkeit, wesentlich filigranere Strukturen umzusetzen, die sich durch den Ersatz der Stahlbewehrung durch hochleistungsfähige Carbonfasern ergeben [1-5]. Problematisch ist jedoch, dass konventionelle Verbindungselemente für den Stahlbetonbau nur bedingt für Bauteildicken zwischen 20 und 70 mm, wie sie im Carbonbetonbau üblich sind, konzipiert sind. Carbonbeton eignet sich zur Umsetzung einer modularen Bauweise. Dabei werden vorgefertigte Module zur Baustelle transportiert und dort miteinander verbunden [6]. Der Transport sowie die einfache und sichere Montage und Demontage führen zu bisher unbeachteten Anforderungen an die Verbindungstechnik. Um die Vorteile und das Potenzial des Carbonbetons zur Umsetzung einer modularen Bauweise voll ausnutzen zu können, sind neue Verbindungstechniken nötig.

The paper shows possibilities for improving the joining process of self-pierce riveting with solid rivets (SPR-SR) by increasing tool velocity. The focus is put on the joining process of high-strength steel sheets with aluminum sheets. Proper and reliable joining of these material combinations is a major challenge for mechanical joining techniques. In the conventional joining process, with common tool velocities well below 1 m/s, different problems during the joining process caused by the high strength of the steel sheets can occur. These problems can be reduced significantly by increasing tool velocity.

The lack of suitable connectors for thin‐walled carbon concrete elements with their known resource and material saving properties still represents a major obstacle for practical application. On top, the on‐site installation remains a labor‐intensive task. To overcome this limitation, we report the development of an active assembly connector that enables simple and safe installation of carbon concrete façade elements and increases assembly efficiency. Moreover, the active assembly features permit an assembly without physical access to the connector, called blind assembly. Its concept is based on the recovery expansion of iron‐based shape memory alloys (Fe‐SMA). This paper presents material characteristics such as recovery stress and strain of the Fe‐SMA in compression. The connector concept uses an anchor rail that blocks the recovery extraction of a Fe‐SMA‐fastener to produce a stable, frictional and linear connection. Tensile tests show the impact of design parameters and high pull‐out forces with sufficient design. Also, ongoing long term tensile tests show small creep, so far. The anchor channels integrate well with carbon concrete façade panels. The heating concept with heating cartridges works well, even under cold winter conditions. Wind test results exceed requirements. Finally, a field test shows excellent installation results and proves the ease of assembly as well as the ability for blind assembly.