Materials - Häme University of applied sciences
Materials
nainen pitetlee isoilla pihdeilla metallin palaa
Woman holding a hot plate with tongs

Materials

Materials

Who are we

Our research group has solid knowledge of the formability and joining methods of demanding sheet metal products, as well as the mechanical properties of materials, especially metals. We also have diverse expertise in adhesion and abrasion resistance of coatings and the friction properties of sheet materials. AM materials and methods are also in our focus. 

What do we do 

Our main research competence is applied research on mechanical properties of materials, especially metals, and formability and joining methods. In addition, powder materials of the additive manufacturing (AM) methods and methods themselves are in the core of our research competence. The research on sheet metal forming concentrates on formability of materials in different forming processes, as well as parameters affected to the processes such as friction and abrasion for example. Adhesion of the coatings is also our expertise.  We have the infrastructure for research carried out in laboratory. We are committed to working with our industrial customers and partners in long lasting R&D projects, but also in more fundamental research projects. There are different possibilities to carry out the testing, either by following standardized testing protocols or by developing new ways of testing with our other specialized teams. We have good networks and long experience in solving both technical and scientific problems. 

We aim to improve our laboratory capabilities towards advanced mechanical testing and materials characterization methods that would serve the needs of the research and teaching in Häme University of Applied Sciences as well as the R&D need of the collaborating industry. 

Our vision is to enhance the sustainability of industrial materials technology and manufacturing, as well as the quality of parts and products. We participate in research aiming towards bio-based coatings and AM materials and methods and help ensure the quality and performance of materials and parts. This way, we want to be involved in building a more resource wise and sustainable society. 

Who do we work with

Our research group collaborates with both national and international operatorsOur main partners are national large and SME companies in various industries, as well as academic partners such as universities. We operate strongly in an application-oriented way regarding the properties and use of materials, especially metals and polymers.  

On national level, we actively participate in activities of the Finnish deep drawing associationFinDDRG ry and Sheet Metal Products branch group by Technology Industries of Finland. 

Our infrastructure

Our laboratories in Visamäki and Riihimäki campuses are equipped with various devices required to determine the mechanical properties of materials, such as tensile testing machines of different force cells and Charpy impact device for metals and various hardness testers. With the help of tools connected to tensile testing machines, we can study, in addition to the basic strength properties of materials, various friction, bending load and adhesion properties, among other things. We can do some of these in temperature chamber where the temperature can be changed between -80 °C + 250 °C. All tensile test machines can be equipped with custom-made tools for applied studies. 

We can study the formability of metals with various tools made to the hydraulic press and with the Erichsen machine. We have an oven, for example, for hot stamping that can achieve high temperatures. 

Our automated strain analysis systems (GOM/Aramis, GOM Argus and ASAME) as well as our friction testing equipment (BUT, Bending Under Tension) offer unique technology for the industry and research projects requirements. With these systems it is easy to study strains e.g. during forming processes, as well as strains in formed sheet steel products and evaluate the success of the forming process. They are also used for determining forming limit curves (FLC). 

We carry out material joining research in our group mainly in connection with sheet metal joining. We have equipment for mechanical and resistance welding joints (e.g. spot welding). 

We have capabilities for preparation of polished and etched cross-sections for optical microscopy of microstructures. 

List of equipment

Tensile testing machines

  • Zwick/Roell Z050 
    • with 5 kN and 50 kN force cells
    • Temperature chamber, -80…+250 °C
    • Possibility of tensile, compression and 3- and 4-point bending as well as flat-to-flat friction measurement
    • In addition, tools for T bending and cone bending
    • Electric resistance metering tool 
    • Electric resistance meter Megger DLDO 10x 
    • Shear measurement tools for cylindrical components with small diameters
  • Zwick/Roell Z005  
    • with 100 N, 500 N and 5 kN force cells 
    • Possibility of tensile, compression and plain friction measurement
  • Zwick Z250
    • with 250 kN force cell 
    • Possibility of tensile, compression and 3- and 4-point bending, and custom test methods
    • Safety cabin

Impact test device 

  • MTS Exceed 22
    • 450 J pendulum 
    • Automatic specimen feeding system
    • Possibility of nitrogen cooling up to -120 °C 

Hardness testing (bulk hardness measurements) 

  • Manual Vickers indentation device Valmet KM1 
  • Motorized Brinell indentation device Wilson BH3000 
  • The Vickers and Brinell indentations are measured with a separate microscope
  • Rockwell hardness measurement device Wilson 574 

Forming related machines 

  • Stenhøj two-cylinder hydraulic press FPS 200/100M
    • Upper force max. 2000 kN 
    • Holding force max. 1000 kN
    • Press table size 650 mm x 500 mm 
    • Velocity 1,5 mm/s…10 mm/s 
    • Outer dimension 1915 mm x 1040 mm x 3000 mm (w x d x h) 
    • Tools
        • Tools based on Nakajima method for FLD (Forming limit diagram), t=0,2 mm …5 mm
        • Deep drawing: cylinder Ø75mm, rectangle 50 mm x 100 mm
        • X-die for sheet thicknesses 0,5 mm…0,7 mm and 1 mm…1,2 mm
        • Hot stamping plane tool, outer dimensions 400 mm x 400 mm
  • Hot stamping oven Rohde ME 45/13, automatics TC-504lnd
    • Max. temperature 1300 °C
    • Interior dimensions: 350 mm x 500 mm x 250 mm (w x d x h) 
  • Erichsen device
    • Tools for Swift cupping test, LDR (Limit drawing ratio), IE value (erichsen value), hole expansion test
  • Three strain measuring systems
    • Real-time: Gom Aramis
    • No real-time: Gom Argus and ASAME
  • SWE (Secondary Working Embrittlement)
  • BUT (Bending under tension) forming friction test device
    • Forming friction of thin sheets over a cylindrical forming tool 
  • Flat-to-flat extension for tensile test devices 
    • Measurement of clamping friction or coil friction in thin sheets 

Material joining related machines 

  • TOX clambing system 
  • Self-piercing riveter Henrob LP 

Resistance welding machines

  • Spot and projection welding machine KRW 81 P (electronic steering RCU 101) 
  • Seam welding machine LSK-75 A (electronic steering RCU 101) 
  • Medium frequency resistance welding equipment MF 90 2T (MFRW) 

Wear testing 

  • Taber abrasion tester 

Microscopes 

  • Zeiss Axioskop 2 MAT
    • 5x & 10x & 20x & 50x & 150x Epiplan HD/APOCHROMAT
    • AxioCam ERc 5s 
    • Top and bottom light
    • Polarization filters
  • Leitz WETZLAR
    • Micrometer adjustable table 
    • Possibility to measure threaded profiles (55 and 60 degrees) 
    • Manual measurement with a micrometer scale
  • Zeiss Stemi 2000-C
    • Magnification 0.65-5x 
    • Ring light 
    • Camera adapter option (AxioCam ERc 5s) 
    • Measurement possibility
    • Top light
  • Reichert metal microscope 
  • Macroscope
    • Magnification 0.7-4.5x 
    • Image area approx. 60 x 80 mm
    • Possibility of measurement with micrometer accuracy 
    • Digital images with scale and measuring lines 
    • Micrometer-adjustable digital table 
    • Top light 

Metallographic sample preparation equipment 

  • Precision abrasive cutting device Metkon Micracut 202-AX 
  • Hot-mounting device Struers Labopress-3
    • D30 and D50 mounting units
  • Semi-automatic grinding and polishing device Struers Lapobol-30 
    • Grinding and polishing of mounted or non-mounted samples 

Manual grinding and polishing devices

HÄME UNIVERSITY OF APPLIED SCIENCES