Strain Gauge Module With Metal Substrate For Curved Surface Attachment
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Solution Overview
Problem
Strain gauges with flexible polyimide bases are difficult to attach to measurement targets due to poor adhesion, requiring special methods like heating and pressurizing, and struggle with accurate strain detection on surfaces with varying roughness.
Innovation Solution
A strain gauge module comprising a film-like strain detection device attached to a thin-plate metal substrate via an adhesive, where the substrate's surface roughness and thickness optimize attachment and strain sensitivity, allowing for easy fixation to curved targets and reducing the impact of surface roughness on measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible polyimide base is used for the strain gauge, then the strain gauge can conform to curved surfaces, but attachment to measurement targets becomes difficult due to poor adhesion
Solution Approach 1:
The strain gauge is divided into two separate components: a flexible polyimide base layer that conforms to curved surfaces, and a metal substrate layer that provides attachment capability. This segmentation allows each layer to perform its specific function optimally without compromising the other.
Solution Approach 2:
The invention uses a composite structure combining polyimide (flexible, conformable) with metal substrate (rigid, adherent). This composite material approach leverages the complementary properties of both materials to achieve both conformability and reliable attachment simultaneously.
2Ease of manufacture
If special adhesion methods like heating and pressurizing are used, then attachment to measurement target improves, but device complexity and operation time increase
Solution Approach 1:
The attachment function is extracted from the polyimide base and transferred to a separate metal substrate layer. This allows the polyimide base to remain simple and flexible while the metal substrate handles the attachment requirement through standard adhesive methods, eliminating the need for complex heating and pressurizing procedures.
3Stability of the object's composition
If polyimide material is used for the base, then flexibility is achieved, but adhesion to measurement target becomes poor
Solution Approach 1:
The functional requirements are segmented between two materials: polyimide provides flexibility and conformability, while metal substrate provides adhesion strength. Each material is selected for its optimal property, and the combination achieves both requirements simultaneously.
Solution Approach 2:
A composite structure combines polyimide and metal substrate to achieve properties that neither material possesses alone. The polyimide layer maintains flexibility while the metal substrate layer provides strong adhesion, creating a synergistic composite material system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables straightforward attachment to measurement targets without special adhesion methods and enhances strain detection accuracy by minimizing the effect of surface roughness, ensuring stable and sensitive strain measurement.
Implementation Method 1
The film-like strain detection device (30) is attached to the upper surface (10a) of the thin-plate metal substrate (10) via an adhesive (20)
Data Source
AI summary
A present strain gauge module includes a film-like strain detection device that is to be attached to a measurement target and includes a terminal on an upper surface thereof, and is configured to detect strain generated in the measurement target; and a thin-plate metal substrate including an upper surface and a lower surface. The film-like strain detection device is attached to the upper surface of the thin-plate metal substrate via an adhesive. The lower surface of the thin-plate metal substrate serves as an attachment surface that is to be attached to the measurement target.