Strain Gauge Test
Strain Gauge Test
Strain gauge testing is the practical assessment of flexion on specific areas of a product while it is under stress. Strain gauges are devices that are generally used by engineers to measure the effect of external and internal forces on a body or an object. Strain gauge measures strain directly, which in turn can be used to determine stress, pressure, torque and other needed measurements.
A flexible substrate serves as insulation for the metal foil that makes up each strain gauge. As the surface of the object being measured extends or contracts, the two leads transmit a current via the gauge, which measures the change in resistance.
A Wheatstone bridge measures the change in resistance across the metal foil as the strain gauge is subjected to the bending factor.
Strain gauge testing is a common application that experts use in detecting root causes of failures. It also may be used to measure static strain due to relatively constant loads such as pressure and heat expansion.
Types of Strain Gauge
- Quarter Bridge Strain Gauge
- Strain Gauge Rosettes
- Piezoresistor
Common uses for Strain Gauge Test
- Testing ship hulls
- Construction applications
- Measure stress on Printed Circuit Boards (PCBs)
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Advantages of Strain Gauge Test
- It is very sensitive
- Inexpensive and reliable
- They are extremely accurate
- As there is no moving part, there is no wear and tear
Limitations of Strain Gauge Test
- It measures strain in only one direction
- Sensitive to overload and can get damaged
- Performance is affected by temperature, humidity, and some other factors
- Not suitable for underwater applications.
