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WP 100 Deformation of bars under bending or torsion



  • Elastic deformation of statically determinate or indeterminate beams under bending load
  • Elastic torsion of round bars under torque
  • Influence of material, cross-section and clamping length on deformation


Technical Description

Bending and torsion are typical loads to which components are subjected. The resultant stresses and deformations can lead to failure of the component. A number of different factors play a role in this, including the material, the cross-section of the bar, the clamping length and the method of bearing support.

WP 100 investigates the influence of these factors on the deformation of a bar under bending load or torque. A set of test bars has been assembled so as to permit direct comparison of measurement results. The bar under investigation is fixed to two movable support blocks and loaded down by a load. A dial gauge records the resulting deformation. The support blocks include clamping chucks to hold the torsion bars and bearings for the bars in the bend test. The bearings offer a range of clamping options, enabling statically determinate or indeterminate bearing supports to be investigated.

The torque is applied by a device mounted on a support block. The point of load application to generate the bending moment is adjustable.

The various elements of the experiment are clearly laid-out and housed securely in a storage system. The complete experimental setup is arranged on the frame.

The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

Learning Objectives / Experiments

Bending tests
- determination of the modulus of elasticity
- statically determinate systems
  * beam mounted on 2 supports; cantilever beam
- statically indeterminate systems
  * dual-span beam
- deformation of a beam dependent on
  * material 
  * geometry (section width, height and length)
  * type of support and length of span 
- formulation of proportional relationships for the deformation
Torsion experiments
- determination of the shear modulus of various materials
- angle of twist dependent on
  * clamping length
  * bar diameter
- formulation of proportional relationships for the angle of twist


[1] elastic deformation of bars under bending or torsion
[2] bending tests with statically determinate and indeterminate systems
[3] torsion tests with a statically determinate system
[4] supports in the bending test may be clamped or free
[5] 2 adjustable blocks with clamping chuck for torsion tests and supports for bending tests
[6] loads to generate the bending or torque 
[7] dial gauge with bracket
[8] storage system to house the components

Technical Data

17 bars for bending tests
- material: aluminium, steel, brass, copper
- height with LxW 510x20mm: h=3...10mm
- width with LxH 510x5mm: w=10...30mm
- length with WxH 20x4mm: l=210...510mm
- LxWxH: 20x4x510mm (aluminium, steel, brass, copper)
- LxWxH: 10x10x510mm (aluminium)

22 torsion bars
- material: aluminium, steel, brass, copper
- length with d=10mm: 50...640mm (aluminium)
- dxL: 10x50mm/10x340mm (aluminium, steel, copper, brass)
- diameter with L=50/340mm: d=5...12mm (steel)
Dial gauge: 0...10mm, graduations: 0,01mm
Tape measure, graduations: 0,01m

- 1x 1N (hanger)
- 1x 1N, 1x 4N, 1X 5N, 1x 9N

Dimensions and Weight

LxWxH: 1000x250x200mm
Weight: approx. 18kg
LxWxH: 1170x480x207mm (storage system)
Weight: approx. 12kg (storage system) 

Scope of Delivery
1 frame
2 bearing blocks
1 device to generate the torque
17 bars for bending test
22 torsion bars
1 dial gauge with bracket, 1 tape measure
1 set of loads including hanger 
2 hexagon socket wrenches
1 storage system with foam inlay  
1 set of instructional material

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