In WP1, two industrial case studies are identified where the use of bolted connections in high strength steel could provide added value for the end-users. As a first case study, the cross member of a truck chassis is chosen (DAF Trucks), as it offers the potential to transform a bolted assembly of lower strength steel into a bolted assembly of high strength steel that has at least the same static strength, but an increased performance and/or lower weight. As a second case study, the cleaning shoe frame of a combined harvester is selected (CNH Industrial), as it offers the potential to move from welded connections in standard structural steel to a bolted connection in high strength steel.

Objectives

  • Devise a precise work plan for the defined case studies that will be carried out during the project as agreed upon by all industrial partners. For each case study a specific setup will be elaborated involving the material grade used, plate thickness, type and size of the joints and the load spectrum that it will be exposed to. Also, benchmark comparisons with a welded analogue will be defined.
  • Alongside, an inventory of the most frequently adopted connections by the end users and their associated problems with respect to fatigue will be made, including an overview and evaluation of the current way of modelling and determining the fatigue behaviour of bolted joints in their applications.
  • Collect relevant fatigue data on high strength steel welded connections that has a direct relation with this project, i.e. for the exact same grade of materials and thicknesses and to define a comparison basis for “equivalent” welded and bolted connections. Much of this information will come from the finished FATWELDHSS project, but also from other sources (other project reports and input from the partners). This data will be used throughout the project as a comparison basis for the bolted connections.