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FL 111 Forces in a Simple Bar Structure
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Statics /

FL 111 represents a simple bar structure. In the single plane system the bars are only subjected to compression and tension. Loads are applied only to the nodes. 
  The unit comprises three members that are joined together using discs such that the joints are free to move. A longitudinally adjustable bar permits the bar structure to be constructed with different angles. The bars engage in the discs by snap-locks. Two of the node discs also form the supports (fixed and free) and are clamped to the sturdy aluminium section base frame. The external load is applied to the upper nodal point by means of weights.
  The bar forces occurring are measured by the deformation of leaf spring elements in the middle of the bar. The method of joints enables the bar forces to be determined by formulating a system of equations.


Learning Objectives / Experiments

- Measurement of bar forces 
- Calculation of bar forces by the method of joints
- Comparison: measurement result - calculation - graphical method


[1] Resolution of forces in a single plane, statically determinate system
[2] 3 node discs, 2 of which serving as supports
[3] 3 bars, each fitted with a leaf spring element and dial gauge
[4] 2 fixed bar lengths, 1 variable bar length
[5] 5 different angles adjustable between bars
[6] Box to house the components


Technical Data

- fixed bar: l=440mm
- adjustable bar: l=440, 622, 762mm
Angle between bars
- 60° - 60° - 60° / 45° - 90° - 45°
- 30° - 120° - 30° / 30° - 30° - 120°
Dial gauge
- measuring range: 0...10mm, graduations: 0.01mm
Weight set: 1x 1N (hanger), 1x 10N, 2x 20N
Leaf spring element: force measuring range 0...50N


Dimensions and Weight
l x w x h: 900 x 200 x 600 mm
Weight: approx. 15 kg
Scope of Delivery
1 frame, 3 bars, 3 node discs, 3 dial gauges, 1 set of weights, 1 box with foam inlay, 1 set of instructional material
Order Details

021.11100  FL 111  Forces in a Simple Bar  Structure