High-temperature extensometer

Description 

The spring-loaded axial high-temperature extensometer consists of an upper and lower arm which maintain contact with the specimen without the necessity for locating ridges or indents. This is achieved by means of a spring-block outside the furnace/heating arrangement. The spring force is less than 500g. Extensometer arms are available with ceramic points or fork ends.

•    Si-Plan high temperature extensometers of this design have been in continuous use for over 30 years.

This design differs from many competitors in that the measuring element is within the furnace and directly close to the test sample. This has the benefit of reduced noise and improved test frequency capability. Testing frequencies up to 30Hz have been achieved without slippage.

Application 

Ideal for strain control cyclic fatigue and creep fatigue applications, where long term stability is essential.

Construction 

Manufactured from a special nickel alloy with high corrosion resistance even at temperatures in excess of 950°C.

Operating temperature 

• Standard range: up to 850°C
• Extended range: up to 950°C

Gauge length 

• Standard range: 6 – 10mm
• With additional plate: 6 – 25mm

The gauge-length is set by the passive arm plate held in place by means of a locking-screw.

Standard working range 

The standard working range of the extensometer is 1.1mm.