Bench-mounted machine which demonstrates the phenomenon of creep under diff erent conditions and in diff erent materials
Key Features
• Ideal for student use and classroom demonstrations
• Demonstrates the three phases of creep
• Demonstrates eff ect of temperature on creep
• Compact and easily stored
• Supplied with weights and test specimens
• Inexpensive specimens readily available in lead and plastics
• Completely self-contained – needs no other parts
Description
This simple machine uses specimens of lead and diff erent plastics which creep signifi cantly at room temperature and under low loads.
Its main part is a simple lever (load beam) with a mechanical advantage of 8:1. The load beam gives a steady and uniform tensile load. A digital indicator measures the extension (creep) of the specimen under load. To ensure correct loading of the specimen, the load beam has a ball-bearing pivot.
To apply a load, students add weights to a weight hanger and measure time and the creep. For eff ect-oftemperature tests, the student freezes or heats a coolpack and places it next to the specimen. They then fi t the transparent enclosure to preserve the temperature around the specimen during the test.
Students may record and plot results by hand, using a timer (not supplied) and the readings from the digital indicator and thermometer. Alternatively, the student can use TecQuipment’s optional Versatile Data Acquisition System (VDAS®) to capture the data, plot charts and export data.
A user guide is supplied with the Creep Machine. The guide includes full details of the equipment, detailed experiment procedures, theory and results.
For quick and reliable tests, TecQuipment can supply VDAS® which gives accurate real-time data capture, monitoring and display, calculation and charting of all important readings on a computer (computer not included).
For connection to VDAS® the Creep Machine includes a thermocouple with in-line transmitter, and a lead to connect the digital indicator to VDAS®.
learning outcomes
An extensive range of experiments may be carried out with this apparatus, including:
• The normal breaking load of a specimen over a fi xed time
• Relationship between breaking load and time for lead specimens
• Time extension curves to show the three phases of creep (primary, secondary and tertiary)
• The eff ect of temperature on the creep rate of specimens
• Creep recovery
Recommended Ancillaries
• Bench-mounted version of the Versatile Data Acquisition System (VDAS-B)
• Extra specimens:
CP1010 Lead to BS EN 12588:2006
CP1020 Polypropylene
CP1025 Nylon 66 unfi lled
CP1030 Unplasticised PVC
