Deformation of curved-axis beams (FL 170)

Deformation of curved-axis beams (FL 170)

elastic deformation of curved-axis beams



  • In construction engineering, a distinction is made between beams and arches.
  • An arch is a statically indeterminate supported structure with a curved axis and two fixed supports or clamp fixings.
  • The supports of an arch (such as a double-articulated arch) absorb forces vertically and horizontally.
  • The ends of the arch in the supports do not move.
  • This produces the static arching effect of the system.
  • In mechanical engineering, crane hooks and chain links are typical examples of a curved beam.
  • FL 170includes three different beams, borne on statically determinate supports:
  • circular beam,
  • a semi-circular beam and
  • a quadrant beam.
  • The beam under test is loaded with weights.
  • Dial gauges record its horizontal and vertical deformations.
  • All three beams have the same cross-section and so the same second moment of area.
  • This enables test results to be directly compared.
  • Simi-circular and circular beams are fixed to a support on the pillar.
  • The quadrant beam is clamped into a support block.
  • The various elements of the experiment are clearly laid-out and housed securely in a storage system.

Technical Details;


  1. elastic deformation of curved-axis beams under load
  2. 3 different beams with the same cross-section: circular beam, semi-circular beam, quadrant beam
  3. support block to fix the quadrant beam
  4. pillar with support for mounting the circular or semi-circular beam
  5. 3 dial gauges to record the horizontal and vertical deformation
  6. storage system to house the components

Technical Data:

Curved-axis beam:

  • radius: approx. 150mm
  • cross-section WxH: 20x5mm
  • material: steel, galvanised

Dial gauges:

  • measuring range: 0…20mm
  • graduation: 0,01mm


  • 1x 1N (hanger)
  • 2x 2N
  • 1x 5N
  • 1x 10N
  • 4x 20N

Dimensions & Weight:

  • L x W x H: 400x300x650mm
  • Weight: approx. 21kg
  • L x W x H: 1170x480x178mm (storage system)

Learning Objectives/Experiments:

  • bending behaviour of a curved-axis beam
  • circular beam
  • semi-circular beam
  • quadrant beam
  • application of the principle of virtual forces (the force method) to calculate deformation
  • second moment of area
  • comparison of calculated and measured deformations

Scope of Delivery:

  • 1 base plate with pillar
  • 3 beams
  • 3 dial gauges
  • 1 set of weights
  • 2 hexagon socket wrenches
  • 1 storage system with foam inlay
  • 1 set of instructional material


  • circular, semi-circular and quadrant beams


Optional: WP 300.09 Laboratory trolley


Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.