- Home
- Industory News
Industory News
Technical specifications of strain gauges
Date: 2018-09-05
Resistance strain gauges, also known as strain gauges or strain gauges, are sensing elements used in resistance strain testing to convert strain into changes in resistance.
Geometric dimensions: Grid length (mm) is the length of the strain gauge resistance wire in its axial direction, and grid width B is the distance between the outer sides of the resistance wire grid perpendicular to the axial direction of the strain gauge.
Resistance value R: refers to the resistance value of a strain gauge measured at room temperature without external force, in ohms (Ω). The resistance value of the strain gauge should be compatible with the measuring circuit, generally taken as 120 Ω.
Sensitivity coefficient K: refers to the ratio between the relative change in resistance of the strain gauge installed on the surface of the test piece under unidirectional stress in its axial direction and the axial strain in the area where the strain gauge is installed on the surface of the test piece.
Strain limit: generally refers to the strain value on a specific material where the relative error between the indicated strain and the actual strain does not exceed 10% at a constant temperature.
Insulation resistance: refers to the resistance between the strain gauge lead and the material of the specimen on which the strain gauge is installed, measured in megaohms (M Ω). It is an important indicator for measuring the quality, bonding performance, and curing degree of strain gauges. In general, insulation resistance above 200M Ω is necessary to ensure the normal progress and accuracy of strain measurement.
Maximum allowable current Imax: The maximum current allowed to pass through a strain gauge without affecting its operating characteristics. Generally, it is 25mA for static measurement and 75-100mA for dynamic measurement.
Temperature effect: refers to the phenomenon of changes in strain gauge resistance caused by temperature fluctuations. During the testing process, changes in ambient temperature and heating of the sensitive grid can cause changes in the temperature of the strain gauge. The method to eliminate temperature effects is to use temperature compensation.
Zero drift and creep: Zero drift, also known as zero drift, refers to the variation of strain indicated by a pre attached strain gauge over time under the condition of constant temperature and no mechanical strain. The possible causes may be poor curing of the adhesive or changes in insulation resistance caused by environmental climate, or relaxation of strain gauges during installation. Creep refers to the change in strain indicated by installed strain gauges over time when subjected to a certain temperature and mechanical strain.
Fatigue life: refers to the number of cycles in which a strain gauge that has been installed can work continuously without fatigue damage under a certain mechanical strain and temperature.
Geometric dimensions: Grid length (mm) is the length of the strain gauge resistance wire in its axial direction, and grid width B is the distance between the outer sides of the resistance wire grid perpendicular to the axial direction of the strain gauge.
Resistance value R: refers to the resistance value of a strain gauge measured at room temperature without external force, in ohms (Ω). The resistance value of the strain gauge should be compatible with the measuring circuit, generally taken as 120 Ω.
Sensitivity coefficient K: refers to the ratio between the relative change in resistance of the strain gauge installed on the surface of the test piece under unidirectional stress in its axial direction and the axial strain in the area where the strain gauge is installed on the surface of the test piece.
Strain limit: generally refers to the strain value on a specific material where the relative error between the indicated strain and the actual strain does not exceed 10% at a constant temperature.
Insulation resistance: refers to the resistance between the strain gauge lead and the material of the specimen on which the strain gauge is installed, measured in megaohms (M Ω). It is an important indicator for measuring the quality, bonding performance, and curing degree of strain gauges. In general, insulation resistance above 200M Ω is necessary to ensure the normal progress and accuracy of strain measurement.
Maximum allowable current Imax: The maximum current allowed to pass through a strain gauge without affecting its operating characteristics. Generally, it is 25mA for static measurement and 75-100mA for dynamic measurement.
Temperature effect: refers to the phenomenon of changes in strain gauge resistance caused by temperature fluctuations. During the testing process, changes in ambient temperature and heating of the sensitive grid can cause changes in the temperature of the strain gauge. The method to eliminate temperature effects is to use temperature compensation.
Zero drift and creep: Zero drift, also known as zero drift, refers to the variation of strain indicated by a pre attached strain gauge over time under the condition of constant temperature and no mechanical strain. The possible causes may be poor curing of the adhesive or changes in insulation resistance caused by environmental climate, or relaxation of strain gauges during installation. Creep refers to the change in strain indicated by installed strain gauges over time when subjected to a certain temperature and mechanical strain.
Fatigue life: refers to the number of cycles in which a strain gauge that has been installed can work continuously without fatigue damage under a certain mechanical strain and temperature.
Open Sitemap
Copyright © 2017 Shenzhen Qualitykon Technology Co.,Ltd. All Right Reserved
Tel: 0755-81464182 Fax: 0755-89370613 Address: No. 319, No. 258, Xingye 1st Road, Rentian community, Fuhai street, Bao'an District, Shenzhen