What is Huggenberger extensometer?

A mechanical extensometer known as Huggenberger extensometer, with magnification of change in length of the order of 1200. The least count on measurement scale is 0.5 mm. Then least count of change in length on gauge length is 0.5/1200 = 4.166 × 10 –4 …

What is settlement extensometer?

Extensometers are used to measure movements of soil and rock along a single axis. Applications for extensometers include: Monitoring settlement in excavations, foundations, and embankments. Monitoring subsidence above mines and tunnels. Monitoring convergence in underground openings, such as tunnels.

How does a borehole extensometer work?

What is a Borehole Extensometer? An extensometer is a measuring device designed to measure changes in the length of a specific object. When mounted in a fixed position relative to a bank of soil or a rock face, extensometers are capable of measuring displacement (movement) with a high degree of accuracy.

How does an extensometer work?

The principle works by illuminating the specimen surface with a laser, the reflections from the specimen surface are then received by a CCD camera and processed by complex algorithms. Laser extensometers can also be used for testing at elevated or sub zero temperatures.

Why is extensometer more accurate?

The mechanical parts that transfer extension, via knife edges, from the specimen to the internal transducer are short and stiff. There is practically no relative movement between the specimen and the extensometer, resulting in a high level of measurement accuracy.

What are the types of extensometer?

Usually, the extensometers are classified as contact, non-contact, laser, and video extensometers. However, the working principle of extension-meters depends on its type as well as the application area.

What are the limitations of an extensometer?

Disadvantages of Contact Extensometers For thin foils and wires, the contact force of the extensometer can increase the apparent stiffness of the test specimen and the weight of the contact extensometer itself can distort delicate specimens thereby causing erroneous results.

Why do we use extensometer?

An extensometer is an instrument that measures test specimen elongation to characterize strain. To qualify the integrity of a measured signal, standards use quantitative terms such as resolution, deviation, and uncertainty.

What is Piezometer used for?

A piezometer is either a device used to measure liquid pressure in a system by measuring the height to which a column of the liquid rises against gravity, or a device which measures the pressure (more precisely, the piezometric head) of groundwater at a specific point.

What is the least count of extensometer?

0.001 mm
Electronic Mechanical Extensometer (Model : EE – 2)

Why extensometer is remove after yielding occurs?

Extensometer has to be removed before sample fails to prevent damage to the device.

Why is it advisable to use an extensometer to measure strain?

Extensometers are generally used in industries where manufacturers need to test tensile strength of the materials they use, to determine if they can withstand the amount of strain typically put on them. Extensometers are also used in field settings, such as mines.