Strain Gauge Fundamentals
Strain gauges have been around for almost 80 years and continue to be key assets for measuring fatigue and testing materials for productivity and safety reasons. But how do I calculate material stress from strain? How can I select the right strain gauge and install it correctly? Our experts dug deep to provide their best answers for you about all the important questions regarding strain measurement using strain gauges. Click an option below to direct you to the content on the page.
- Basics of Strain Measurements and Experimental Stress Analysis
- Selecting the Right Strain Gauges, Adhesives, Covering Agents and More
- Installation of Strain Gauges: All there is to Know
- Reduction and Elimination of Measurement Errors
- Acquiring Data with the Right Hardware and Software
- Training, Webinars and References on Strain Measurements
1. Basics of Strain Measurements and Experimental Stress Analysis
Experimental Stress Analysis
Experimental Stress Analysis (ESA) is the analysis of the mechanical stress state in materials, which is performed though experiments using strain gauge measurements. Learn the existing types of stress, their origin and states, or how to determine stress from measured strains by reading about it below.
Wheatstone Bridge Circuit
The Wheatstone bridge can be used in various ways to measure electrical resistance: For the determination of the absolute value of a resistance by comparison with a known resistance, for the determination of relative changes in resistance. Learn the basics and theory of operation.
2. Selecting the Right Strain Gauges, Adhesives, Covering Agents and More
Selecting Adhesives for Strain Gauge Installation
The bonding materials have the task of firmly attaching the strain gauge to the measured object’s surface and transferring the object’s deformation without loss to the strain gauge. The various conditions and influences, and application options, require different bonding materials and installation methods.
Selecting the Right Covering Agent for Strain Gauges
The quality of a measurement made with a strain gauge essentially depends on the type of installation and design of the measuring point. A thorough preparation of the installation surface, correct connection, and protective covering are important factors for problem-free results.
3. Installation of Strain Gauges: All There is to Know
Lead-Free Soldering of Strain Gauges: Practical Hints
This article gives hints how to perform lead-free soldering of strain gauges professionally and how to ensure high a reliability in your measurement.
Wiring of a Bolt Strain Gauge
It is difficult to bond a strain gauge to a bolt while measuring the tightening stress. Normally, this requires the use of heavy machinery, but the application of special electrical strain gauges provides a simplified solution for measuring the axial load on bolt elements. The finalization after bonding the gauge in the bolt is shown in this helpful article.
4. Reduction and Elimination of Measurement Errors
Measurement Uncertainty: Less Errors, Better Results
This article addresses possible sources of error when strain gauges are used in experimental stress analysis and shows how to successfully assess measurement uncertainty already in the design stage.
Article: Temperature Compensation of Strain Gauges
In this article we will show you which (unwanted) temperature effects can affect the measurement result when using strain gauges. You will also find practical assistance for how you can minimize these effects or compensate for them entirely.
5. Acquiring Data with the Right Hardware and Software
Strain gage ¼ bridge calibration with shunt signals
This paper explains how fast and precise calibration procedures can be carried out automatically by means of simple shunt resistor switching technique.
Linearity and Sensitivity Error
This article describes the basic principles of strain measurement by means of strain gauges, from the strain itself via the variation in resistance to the eventual electrical signal, and compares the magnitude of error of the voltage-fed bridge circuit and the current-fed circuit.