Features

• Representation of simple stability problems on a buckling bar 
• Determination of the buckling load under different conditions 
• Infinitely variable load application on the buckling bar 

Buckling is a stability problem which occurs in practice when slim components are subjected to  compressive loading. Following a "disturbance" to its equilibrium, such as caused by compressive  loading, a stable system returns to equilibrium when the loading is removed. If the compressive load  increases excessively, instability of the system results. The component buckles and fails. The critical  compressive load at which the system becomes unstable is termed the buckling force. 
A simple model for representing stability problems is a two-part bar with an elastic joint which remains  stable up to a certain load level. If the buckling force is exceeded, the bar suddenly buckles and so  becomes unstable. 
Tesca Stability: Bar Buckling under Load is used to investigate simple stability  problems on a buckling bar under different conditions. The buckling bar is in two parts, with a central  articulated joint. A compressive load is applied to the bar by a lever and weights. The infinitely  variable loading is determined precisely with the aid of a scale on the load application lever. 
Experiments can depict a variety of conditions, such as an elastic joint or an elastic clamp fixing. Two  tension springs serve as the elastic joint. For the elastic clamp fixing option, a steel leaf spring is mounted in the bottom joint. The variable length of the leaf spring means various degrees of clamping  are possible. The two cases can be combined. 
Another experiment demonstrates the influence of additional shear forces. It involves applying a  shear force to the joint in the buckling bar with a cable and a weight. 
In all experiments the buckling bar is placed under load until it reaches an unstable situation. The  length of the lever arm at which the buckling bar buckles is read from the scale and the buckling force  is then determined. 
The well-structured instructional material sets out the fundamentals and provides a step-by-step  guide through the experiments. 

Specifications
Investigation of the buckling load under different conditions (elastic joint, elastic fixed end) 
Two-part buckling bar with central joint 
Loading infinitely variable with lever and set of weights 
Determination of loading via scale on load application lever 
Various degrees of clamping via leaf spring with variable length on bottom support 
Thrust pad guided friction-free inside spherical shell 
Low-friction joints with roller bearings 
Device to generate shear forces 
Storage system to house the components

Technical Specifications
Two-part buckling bar with central joint 
      -     WxH: 20x20mm 
      -     Length: 2x250mm 
      -     Support: pinned-pinned (articulated-
        articulated) 
Elastic joint 
      -     2 tension springs, rigidity: 2N/mm 
      -     Lever arm: 50mm 
Elastic clamp fixing with steel leaf spring 
      -     Length: 500mm
      -     Cross-section: 10x2mm 
      -     2nd moment of area: 6,66mm4 
      -     Modulus of elasticity: 205000N/mm2 
Compressive force range: 25...120N 
Shear force: 0...20N 
Load application lever, lever ratio: 1:2 - 1:5 
Set of weights 
      -     8x 1N 
      -     6x 5N 
      -     2x 1N (hangers) 

Experiments
Determination of the buckling force for the case of an:  
      -     Elastic joint 
      -     Elastic fixed end support 
Investigation of the buckling behavior under the influence of: 
      -     Of additional shear forces 
      -     Of pre-deformation 

Scope of Delivery

• 1 buckling bar, two-part 
• 1 set of weights 
• 4 supports 
• 1 deflection roller 
• 1 load application lever 
• 1 leaf spring 
• 2 tension springs 
• 1 cord 
• 1 hexagon socket wrench 
• 1 storage system with foam inlay 
• 1 set of instructional material