What is an extensometer used for?
An extensometer is an instrument that measures test specimen elongation to characterize strain. The range of applications where extensometers are used is diverse and the technical requirements for these devices are multifaceted. There is no single device that meets all needs for all applications.
What is Rod extensometer?
Rod extensometer is a common instrument used to accurately monitor small displacements in soil, rock and concrete along axis of a borehole.
What is the use of extensometer in case of dam safety?
It is used in the measurement of foundation movements and controlling of natural and cut slopes. The displacement of retaining walls, bridge piers and abutments can also be monitored by the soil extensometer. It also measures displacement across construction joints in concrete, and across joints/faults in the rock.
What is use of extensometer in UTM?
UTM-515, Extensometer Extensometer is the essential equipment for measuring the elongation of specimen. It used in tensile test and sense the elongation when testing is processing. Extensometer is helpful to analysis test data at the same time, including force, elongation, time and so on.
Why we remove the extensometer after yielding occurs?
Extensometer has to be removed before sample fails to prevent damage to the device.
Why are dam walls curved?
Many arch dams are made of concrete — much less concrete than gravity dams. Arch dams use their special curved shape to hold the water back in the reservoir. This arch dam actually lets water flow over its top.
What is extensometer in UTM?
How does an extensometer measure strain?
Strain measurements are obtained by dividing the change in length by the initial length of the specimen (ε = ∆L/L). Axial extensometers provide strain data by clipping onto the specimen with their knife edges and measuring the displacement in length as load is applied and the specimen is pulled.
Why extensometer is used in universal testing machine?
An Extensometer is a type of strain gauge that is used in conjunction with a Universal Testing Machine in order to measure elongation at high accuracies. Extensometers can also be used to measure in the lateral direction in order to observe and quantify changes to the material in the X reference plane.
Why we remove extensometer after yielding occurs?
What instrument measures tensile strength?
universal testing machine
A universal testing machine (UTM), also known as a universal tester, materials testing machine or materials test frame, is used to test the tensile strength and compressive strength of materials. An earlier name for a tensile testing machine is a tensometer.
What can a rod extensometer be used for?
The rod extensometer monitors changes in the distance between one or more downhole anchors and a reference head at the borehole collar. Typical applications include: Monitoring settlement in foundations. Monitoring subsidence above tunnels and mines. Monitoring heave in excavations.
What kind of anchors are used for extensometers?
A groutable reinforced bar anchor (1) is attached to fibreglass (2.a) or AISI 410 stainless steel (2.b) connecting rods of appropriate length, as specified in the design. Fibreglass connecting rods are supplied from the factory in single lengths.
How does an electrical borehole extensometer work?
The electrical borehole extensometer incorporates a vibrating wire transducer for measurement of displacement. A groutable reinforced bar anchor (1) is attached to fibreglass (2.a) or AISI 410 stainless steel (2.b) connecting rods of appropriate length, as specified in the design.
How is an extensometer used in civil engineering?
An extensometer is a high precision instrument specially designed for geologists or civil engineers to measure the elongation of a material under stress. This instrument is perfect for tensile tests. It can also determine yield strength, tensile strength, yield point elongation, strain-hardening exponent, and strain ratio.