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WP 140 Fatigue strength test



  • Continuous adjustment of the load amplitude
  • Differently shaped test bars demonstrate the influence of notching and surface finish
  • Digital counter for load cycle display
  • Automatic shut down on test bar fracture
  • Data acquisition available as accessory


Technical Description

Using this experimental unit, the basic principles of fatigue testing can be teached.

A rotating metal test bar, clamped at one end, is loaded using a spring balance with a point force. This results in a cyclic bending load on the cylindrical test bar. The amplitude of the cyclic loading can be continuously adjusted using a threaded spindle with hand wheel. After a certain number of load cycles, the test bars breaks as a result of material fatigue. In this case the motor is shut down automatically by the stop switch. The number of load cycles is counted by an electrical counter and displayed digitally. This can also be used for measuring the speed.

Differently shaped test bars enable the influence of notching and surface finish on fatigue strength to be demonstrated.

Learning Objectives / Experiments

- fatigue strength of bars subject to cyclic bending load
- influence of different curvature radii and surface finish on fatigue strength
- stress-number (S-N) curve



[1] experimental unit for fatigue strength testing
[2] 3 sets of cylindrical test bars made of steel, special shape bars for demonstrating the influence of notching and surface finish
[3] loading device with movable support, threaded spindle with hand wheel, spring balance
[4] automatic shut down on test bar fracture by stop switch integrated into the movable support
[5] drive via electric motor
[6] speed measurement via contactless inductive speed sensor
[7] electronic load cycle, can also be used to indicate the speed

Technical Data

- speed: 2.800min-1
- output: 0,37kW
Load: 0...300N
Electronic load cycle counter
- 8-digit digital display
- can be switched to display speed
Test bars
- material: steel Ck35
- 3 different shapes

Dimensions and Weight
LxWxH: 840x420x560mm
Weight: approx. 41kg Required for Operation 230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase

Scope of Delivery
1 experimental unit
3x 3 test bars
1 manual

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