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Fields, Methods and Techniques

Fields

The research and technology transfer and knowledge fields of LERMA are the Strength of Materials and the Structures in the broadest sense. It specifies in the analysis, design, calculation and optimization of resistive elements, structural components and structures: especially on complex behaviours, instability phenomena, lightweight structures, experimental measures and verifications: and always looking for to deepen the knowledge and the innovation of concepts and applications.

The areas where LERMA has collaborated with companies and institutions are varied: light and heavyweight machinery, vehicles, racks, construction, maintenance, measurement, biomechanics, bioengineering, renewable energies, nuclear energy, etc.

Methods and techniques

  • Classic analytical methods
    • Linear elasticity
    • Strength of materials
    • Structure theory
  • Numerical simulation (method of finite elements)
    • Linear analysis
    • Analysis without geometric and material nonlinearities
    • Dynamic analysis
  • Materials testing
    • Static tests (tensile, compression, bending, etc.)
    • Fatigue tests
    • Impact tests
    • Static, cyclic and fatigue tests
    • Control by displacement, strain or force
  • Component testing
    • Structural elements
    • Facilities elements
    • Automotive components
    • Parts and components
  • Experimental analysis of stresses and strains
    • Strain gauge
    • Electrical measurement of mechanical parameters (force, torque, pressure, displacement, rotation, etc.)

Facilities and equipment

Servo-hydraulic machine, computer controlled (MTS)

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  • Model 810
  • Servo-hydraulic machine universal testing, static and dynamic
  • Compression testing, tensile, bending, and cyclic fatigue
  • Overall capacity ± 250 kN
  • Overall length of the sample 1100 mm
  • Computer controlled

Multifunction Test Bench

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  • Overall capacity   ±100 kN
  • Overall dimensions 1500x1680x1800 m
  • Bench trials for average size of components in one
    or more axes, static and dynamics.

INSTRON

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  • Model 3366
  • Electromechanical universal testing machine, static
  • Maximum capacity ± 100 kN
  • Sample's maximum length 400x720 mm
  • Test drive of compression and bending

Load frame

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  • Test Framework anchored in concrete slab
  • Maximum capacity 400 kN
  • Samples:
    Maximum width 3 m
    Maximum height 3 m
    Maximum length 12 m

Under longitudinal loads

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  • Setting longitudinal compression tests of uprights and lightweight structures, adjustable to different lengths
  • Maximum capacity is 200 kN
  • Maximum length 7 m
  • Maximum width 1.5 m

Biaxial test bench


  • Setting biaxial testing
  • Axial capacity: 400 kN (compression)
  • Ability section: ±200 kN
  • Measurement of displacements and rotations
  • Testing of compression-bending elements



Data acquisition systems


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  • Three units
    Data acquisition system based on PC ADVANTECH plates,
    PC 816 16-bit. Capture up to 100KS / s.
    Controlled with Labview software itself and designated to the connection and
    data capture

HBM Amplifiers

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  • Model MGC PLUS (three units)
  • 6-channel strain gauge equipment, in groups of 2
  • Resistive or inductive gauges with half or full bridge configuration
  • Digital programming
  • Analogue output signal ± 10 V
  • Possibility of connection to PC

HBM multichannel system

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  • Model UPM 60
  • Strain gauges of 40 multiplexed channels equipment
  • Strain gauges in different configurations
  • Allows data output on paper (miniprinter) or connection
    PC via IEEE 488 or GPIB

Sensors for strain measurement

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  • Set of sensors for strain measurement
    - Force (100 N to 500kN)
    - Bending Moment (10 Nm to 800 Nm)
    - Pressure (300 bar)

Sensor offsets

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  • Set of sensors for measuring shifts
    - Travel (2 mm to 500 mm)
    - Angle (± 5º)

Computational centre

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  • 5 computers in total, all with network connection
  • Specific software calculation and design for research applications:
    SOLIDWORKS, AUTOCAD, ANSYS, COPRA, ...