INDUSTRY COMPONENT

Strain Gauge

A strain gauge is a sensor that measures strain on an object by converting mechanical deformation into electrical resistance changes.

Component Specifications

Definition
A strain gauge is a precision sensor used to measure strain (deformation) on the surface of an object. It consists of a thin metallic foil pattern bonded to a flexible backing material. When the object deforms under load, the gauge experiences corresponding strain, causing its electrical resistance to change proportionally. This change is measured using a Wheatstone bridge circuit, allowing precise quantification of stress, force, pressure, or torque in industrial applications.
Working Principle
The working principle is based on the piezoresistive effect, where the electrical resistance of a conductor changes when subjected to mechanical strain. As the gauge deforms with the object, its length increases and cross-sectional area decreases, increasing resistance. This resistance change (ΔR/R) is proportional to the strain (ε) via the gauge factor (GF = ΔR/R / ε), typically around 2 for metallic gauges.
Materials
Metallic foil (constantan, nickel-chromium, or Karma alloy) bonded to polyimide or epoxy backing, with copper or silver leads. Protective coatings include silicone rubber or epoxy for environmental sealing.
Technical Parameters
  • Accuracy ±0.5%
  • Resistance 120 Ω, 350 Ω, 1000 Ω
  • Gauge Factor 2.0 ± 0.5
  • Strain Range ±5000 με
  • Temperature Range -30°C to +80°C
  • Excitation Voltage 5-10 V DC
Standards
ISO 4965, DIN 50100, ASTM E251

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Strain Gauge.

Parent Products

This component is used in the following industrial products

Engineering Analysis

Risks & Mitigation
  • Signal drift due to temperature changes
  • Creep under prolonged load
  • Moisture ingress affecting accuracy
  • Fatigue failure from cyclic loading
  • Improper bonding leading to detachment
FMEA Triads
Trigger: Temperature fluctuations
Failure: Thermal expansion causes false strain readings
Mitigation: Use temperature compensation circuits or self-temperature-compensating gauges
Trigger: Overload beyond rated capacity
Failure: Permanent deformation or rupture of gauge element
Mitigation: Implement mechanical stops or overload protection in system design
Trigger: Poor bonding or contamination
Failure: Inaccurate strain transfer or detachment
Mitigation: Follow strict surface preparation and bonding procedures per manufacturer guidelines

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.5% of full scale for standard industrial applications
Test Method
Wheatstone bridge excitation with signal conditioning, verified per ISO 376 for force measurement or ASTM E74 for calibration

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Frequently Asked Questions

How does a strain gauge work in a load cell?

In a load cell, strain gauges are bonded to a deformable element (like a beam or diaphragm). When force is applied, the element deforms, causing strain gauges to change resistance. This is measured via a Wheatstone bridge to calculate the applied force.

What are common applications of strain gauges?

Common applications include load cells for weighing systems, pressure transducers, torque sensors, structural health monitoring, and material testing in manufacturing, aerospace, and automotive industries.

How do you calibrate a strain gauge?

Calibration involves applying known forces or strains to the gauge and measuring output signals. It requires controlled environments, reference standards, and often follows ISO 376 or similar protocols for load cells.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Straight Duct Sections Strain Gauge Assembly