Proving Ground (copy 1)

The proving ground in St. Valentin / Austria with its area of 40 ha has an optimal design for the testing of commercial vehicles and passenger cars. It provides a paved road with 850 m, rough roads and up to 7 km unpaved dirt road tracks with varying ascending slopes.

Our deep understanding about the definition of test collectives that reflect the required vehicle durability in real life in connection with the immediate availability of the proving ground, are the key advantages for customers during the development.

Heavy terrain, slopes with gradients up to 60%, a fording basin with a depth up to 1.8 m and special obstacles qualify this test track also for testing of off-road-, construction- or military vehicles. In addition free field- and ISO-noise measurements as well as test stands for cooling measurements are available .

  • What options do I have for checking the input data?
  • FEMFAT provides the user with a variety of options for checking input during analysis preparation or following the analysis. These are:

    FEM-Model

    •Number of imported nodes & elements (Caution: some "exotic" element types are ignored).

    •Dimensions of model (unit correction to mm may be necessary)

    •Minimum/maximum shell thicknesses

    •Visual control in VISUALIZER including group definition; groups can be displayed in the main program as a label list.

     

    Material Data

    •Numerical control of the data in the material menu

    •Graphical control using the Haigh diagram, S/N curve and cyclic σ - ε diagram

    •In the node characteristics menu by browsing in the node labels for checking all properties (material, roughness, temperature, surface treatment,...)

     

    Stresses

    •In BASIC maximum principle stress of the element with the highest v. Mises equivalent stress

    •For MAX, visual control of the stress sequence or the unit stresses is available in the VISUALIZER.

     

    Menu Item "Check Input Data"

    This function is available immediately prior to starting the analysis that allows a number of input data to be double-checked, in particular, whether the stresses and the material strength form a plausible relationship in terms of the required analysis result (endurance safety factor, damage life in the finite life domain, static safety). Implementation of these checks is strongly recommended, see figure below.

    Note:

    Execution of this function may take some time in MAX, especially if the scratch files have not yet been created.

     

    The following data can be examined in detail:

    •Analysis aim: Endurance, damage, static safety .

    •Analysis group: Name and number of nodes and elements

    •Materials used in the analysis group, including data plausibility check

    •Activated influence parameters

    •Stresses

     

    1. Maximum occurring v. Mises stress for the entire load history compared to the local tensile strength/yield stress.

    2. Maximum v. Mises stresses of individual load channels (ChannelMAX only).
    This function is very useful for estimating the influence of certain channels on the overall result. For example, using the modal superposition method a frequency boundary can be defined in this way above which the higher frequency modes need not be taken into consideration due to the small stress value.

    Because the load-time histories and the channel stresses are combined for this function, inconsistent units can also be easily discovered.

     

    Results

    •Result dialog: Maximum stressed node, S/N curve, utilization statistics.

    •Distribution of all scalar result variables on the model: Any postprocessor can be employed for this or, most comfortably, the VISUALIZER.

     

    Documentation

    •FEMFAT Job File (*.ffj): Necessary for subsequent batch operations.

    •FEMFAT result protocol (*.pro): Detailed information in text format

     
    It is highly recommended to archive both outputs for subsequent comprehension of the analyses; the exact settings can be forgotten faster than you think.

  • Washboard

  • Driving Speed from 15 – 45km/h (Length: 100,0m / Width: 4,0m)

    Test Item: Overall Durability

     

  • Torsion Obstacles

  • Torsion Obstacles Medium-Duty: 300mm (46 pieces)

    Torsion Obstacles Heavy-Duty: 400mm (34 pieces)

    Test Item: Durability of Frame Twisting

     

    Torsion & Parallel Obstacles: 150mm (26 pieces)

    Test Item: Durability Frame, Chassis and Cab Suspension

     

  • Impact Step

    Impact Step 30mm: Driving Speed from 30 – 60km/h (Length: 30.0m / Height: 30.0mm)

    Test Item: Subjective and Objective Impact Evaluation

     

  • Steel Obstacle

    Mounted to Concrete Surface; Axle Load up to 16ton

    Test Item: Function Test (Vertical Impact to Driver Seat)

     

  • Steel Obstacle

    Mounted to Concrete Surface; Axle Load up to 16ton

    Test Item: Function Test (Vertical Impact to Driver Seat)

     

  • Slopes
  • Slope 40%: Length 40% 15m; Width 5m

    Test Item: Function of Drive Train and Difflock Durability

     

    Concrete Slope 60% (Limited to 10t Axle Load): Length 15m; Width 4m, with Side Barriers

    Test Item: Vehicle Function

     

  • Slopes
  • Slope 40%: Length 40% 15m; Width 5m