Strain Gauge Segmented Base for Deformable Surface Mounting

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Solution Overview

Problem

The existing strain gauge mounting structures are limited to configurations where a flat surface is present, restricting their applicability and durability, especially when the measured portion is bent or elastically deformable.

Innovation Solution

A strain gauge with a base member having separate portions for the resistance element and terminal, where the resistance element is adhered to the measured portion, and the terminal is not, allowing for deformation measurement without terminal stress and providing a flexible configuration for various applications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal is bonded to a flat surface on the boss as in PTL 1, then the strain gauge can be securely bonded and reliability is improved, but the applicable structures are limited to configurations with adjacent flat surfaces

Engineering Contradiction:

Improvebonding reliabilityVSAvoidapplicability to various configurations

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The base member is divided into a first base portion for adhering to the measured portion and a second base portion for providing the terminal, separating the bonding function from the terminal provision function. This allows the strain gauge to be applied to various configurations without requiring adjacent flat surfaces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal is extracted from the bonded portion and placed on a separate second base portion that is not adhered to the measured portion. This eliminates the constraint that the terminal must be on a flat surface, enabling application to bent and deformable surfaces.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the terminal is bonded to the measured portion as in PTL 1, then secure bonding is achieved, but the terminal is repeatedly subjected to elastic deformation causing wire break

Engineering Contradiction:

Improvebonding securityVSAvoidterminal durability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The base member is segmented into adhered and non-adhered portions, isolating the terminal from the measured portion. The terminal on the second base portion is not subjected to elastic deformation, preventing wire break while maintaining secure bonding of the resistance element.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal is extracted from the deforming measured portion and placed on a stable second base portion. This removes the terminal from the cycle of elastic deformation, eliminating the cause of wire break while preserving bonding security through the first base portion.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the entire base member is adhered to the measured portion, then secure mounting is achieved, but the terminal is deformed under strain causing stress and potential damage

Engineering Contradiction:

Improvemounting securityVSAvoidterminal stress from deformation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The base member is segmented into a first base portion that adheres to the measured portion and a second base portion that does not. This segmentation allows the terminal to be positioned on a non-deforming section, eliminating terminal stress while maintaining mounting security through the adhered first portion.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The terminal is extracted from the adhered portion and placed on the non-adhered second base portion. This removes the terminal from the harmful deformation cycle, eliminating terminal stress and potential damage while preserving mounting security through the first base portion's adhesion.

Inventive Principle:

Principle #2Taking out (Extraction)

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

This configuration enhances durability and applicability to different configurations by preventing terminal deformation and stress, allowing for accurate strain measurement and improved handling of the strain gauge.

Implementation Method 1

a resistance element provided on the first base portion; the resistance element provided on the first base portion can be deformed according to the strain of the portion being measured. Therefore, a resistance value of the resistance element can be measured

Methodology Applied

Scientific EffectPiezoresistive effect: Piezoresistive Effect

Implementation Method 2

the first base portion being configured to be adhered to the portion being measured

Methodology Applied

Scientific EffectAdhesion: Adhesive

Data Source

PatentUS12163850B2Strain gauge with base member having portion not fixed to a measured portion

Publication Date: 2024.12.10 DENSO WAVE INC

AI summary

A strain gauge has a mounting structure for mounting to a portion being measured. A base member of the strain gauge is partly fixed, by an adhesive, to the portion being measured. The base member includes a first base portion and a second base portion that are mutually separately positioned in a longitudinal direction, a resistance element being provided in the first base portion and a terminal being provided in the second base portion. The first base portion is fixed by a layer of adhesive to the portion being measured, and the layer of the adhesive is not provided on the second base portion such that the second base portion is not fixed to the portion being measured.