Strain Grid: Temperature Range -269°C to +290°C

Component Specifications

Definition

A strain grid is the core sensing component of a strain gauge, consisting of a fine metallic foil or wire pattern bonded to a flexible backing material. When subjected to mechanical strain, the grid's electrical resistance changes proportionally to the applied deformation, following the principle of piezoresistivity. This component is essential for converting physical stress into quantifiable electrical signals in structural testing, load monitoring, and material analysis applications.

Working Principle

The strain grid operates on the piezoresistive effect, where the electrical resistance of the conductive material changes when mechanically deformed. As the grid experiences tensile or compressive strain along its sensitive axis, its length and cross-sectional area alter, causing a proportional change in resistance (ΔR/R = Gε, where G is the gauge factor and ε is strain). This resistance variation is measured through Wheatstone bridge circuits to determine strain magnitude and direction.

Materials

Constantan foil (Cu-Ni alloy) or Karma alloy (Ni-Cr-Al-Fe) for temperature stability, polyimide backing (typically 0.025-0.05mm thick), with epoxy or cyanoacrylate bonding agents. Grid thickness ranges from 3-10μm.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Resistance	120Ω, 350Ω, 1000Ω (standard values)
Grid Length	0.5-150mm
Gauge Factor	2.0-2.1
Strain Limit	±3% to ±5%
Temperature Range	-269°C to +290°C
Excitation Voltage	1-10V DC/AC

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 4965, DIN 50125, ASTM E251

Parent Products

This component is used in the following industrial products

Strain Gauge Assembly

A precision sensing component that converts mechanical strain into electrical resistance changes for measurement applications.

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Engineering Analysis

Risks & Mitigation

Creep and hysteresis effects
Moisture infiltration causing drift
Fatigue failure under cyclic loading
Temperature compensation errors
Improper bonding leading to signal loss

FMEA Triads

Trigger: Poor surface preparation or contamination
Failure: Inadequate bond strength leading to debonding
Mitigation: Follow strict surface cleaning protocols using solvents and abrasion; verify surface roughness (Ra 1-4μm)

Trigger: Excessive excitation voltage
Failure: Grid overheating and permanent resistance change
Mitigation: Limit voltage to manufacturer specifications; use bridge completion resistors; monitor grid temperature

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Resistance tolerance ±0.3%, gauge factor tolerance ±1%

Test Method

Four-wire resistance measurement, thermal cycling tests, humidity exposure per IEC 60068-2-78

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

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Inspection readiness

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Supplier transparency

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Manufacturers of Strain Grid

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Frequently Asked Questions

What is the difference between a strain grid and a complete strain gauge?

The strain grid is specifically the sensing element (the foil pattern), while a complete strain gauge includes the grid plus backing material, bonding adhesive, protective coating, and lead wires.

How do temperature changes affect strain grid measurements?

Temperature changes cause apparent strain due to thermal expansion differences between the grid material and test specimen. Constantan and Karma alloys minimize this effect through low temperature coefficients of resistance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Strain Grid