different specimens show the influence of notching and surface quality

Description:

• Moving components and machine parts are often exposed to periodically fluctuating loads.
• Even if the dynamic load is far below the static load capacity, this load can lead to fracture of the component after a long time because of material fatigue.
• The fatigue strength and design strength of components are determined in fatigue strength tests or endurance tests.
• The WP 140trainer demonstrates the basic principles of fatigue strength testing and the creation of a Wöhler diagram.
• The clean layout and simple operation mean the experimental sequence can be observed in all details and phases.
• In the experiment, a cantilever-mounted and rotating cylindrical specimen is subjected to a single force.
• The load on the specimen corresponds to a cantilever bending beam.
• The specimen is subjected to a pure reverse bending stress and breaks after a certain number of load cycles because of material fatigue.
• The necessary force is generated in the load application device by means of a spring balance and a movable support.
• The load amplitude can be adjusted continuously using the preload of the spring balance by means of a threaded spindle.
• An electronic counter registers the number of load cycles and displays it digitally.
• The impulse for the counter is provided by an inductive proximity switch on the motor coupling. The counter can also be used to measure the speed.
• When the specimen breaks, the stop switch stops the electric motor automatically.
• A protective cover protects against flying fragments.
• Specimens with various fillet radii are included in the scope of delivery to demonstrate the notching effect and the influence of the surfaces.
• By using the WP 140.20system for data acquisition, the measured values can be transferred to a PC where they can by analysed with the software.

Technical Details:

Specifications:

• basic principles of fatigue strength testing
• driven by electric motor
• automatically shuts down when the specimen fractures
• load application device with sliding movable support, threaded spindle with hand wheel, spring balance
• steel cylindrical specimens, various fillet radii
• speed measured by contactless inductive speed sensor or electronic counter for load cycles
• digital counter display
• protective cover for safe operation
• system for data acquisition (WP 140.20) available as an option

Technical Data:

• Electric motor:
  • speed: 2800min^-1
  • power: 0,37kW
• Load force:
  • 0…300N
• Electronic load counter:
  • 8-digit
  • switchable to indicate speed
• Specimens:
  • material: steel
  • 3 different fillet radii
• 230V, 50Hz, 1 phase
• 230V, 60Hz, 1 phase; 120V, 60Hz, 1 phase
• UL/CSA optional

Dimensions & Weight:

• L x W x H: 840x410x600mm
• Weight: approx. 31kg

Learning Objectives/Experiments:

• fatigue strength of bars under reverse bending stress
• influence of different fillet radii and surface qualities on the fatigue strength
• Wöhler diagram

Scope of Delivery:

• 1 experimental unit
• 1 set of specimens (9 pieces)
• 1 set of instructional material

Features:

• continuous adjustment of the load amplitude
• automatically shuts down when the specimen fractures

Accessories:

• Optional:
• WP 140.01Set of 3 specimens, various fillet radii, St
• WP 140.20System for data acquisition
• WP 300.09Laboratory trolley

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.