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WP 140 Fatigue Testing Machine
Education / GUNT Hamburg / Engineering Mechanics and Machine Elements / Properties of Materials /

Using this benchtop unit, the basic principles of fatigue testing can be conveyed. 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 specimen. 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 specimen breaks as a result of material fatigue. In this case the machine 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. Different shape specimens 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

- Preparation of a stress-number (S-N) diagram


[1] Benchtop unit for fatigue strength testing
[2] 3 cylindrical specimens made of steel, Ck35
[3] Special shape specimens for demonstrating the influence of notching and surface finish
[4] Recording of a stress-number (S-N) diagram
[5] Motor speed 2800rpm, power output 0.37kW
[6] Single phase electric motor, 230V , 50Hz
[7] Loading with spring balance 0...300N
[8] Adjustment using threaded spindle with hand wheel
[9] Loading via moveable plain bearing
[10] Automatic shut down on specimen fracture by stop switch integrated into the bearing
[11] Electronic load cycle and revolutions counter with 8-digit digital display
[12] Contactless inductive speed sensor
[13] l x w x h 920x420x560mm


Technical Data


- speed: 2800rpm
- output: 0.37kW
Load: 0...300N
Load cycle counter

- electronic

- 8-digit digital display

- can be switched to display speed
Test bars: tempering steel Ck 35


Dimensions and Weight
l x w x h : 920 x 420 x 560 mm
Weight : approx. 41 kg
Required for Operation
230V , ~50Hz
Scope of Delivery
1 complete fatigue testing machine
3 test bars
1 set of experiment instructions
Order Details
020.14000  WP 140  Fatigue Testing Machine