Abstract
The strain transfer characteristics of resistance strain gauge are theoretically investigated. A resistance strain-type transducer is modeled to be a four-layer and two-glue (FLTG) structure model, which comprises successively the surface of an elastomer sensitive element, a ground adhesive glue, a film substrate layer, an upper adhesive glue, a sensitive grids layer, and a polymer cover. The FLTG model is studied in elastic–mechanical shear lag theory, and the strain transfer progress in a resistance strain-type transducer is described. The strain transitional zone (STZ) is defined and the strain transfer ratio (STR) of the FLTG structure is formulated. The dependences of the STR and STZ on both the dimensional sizes of the adhesive glue and structural parameters are calculated. The results indicate that the width, thickness and shear modulus of the ground adhesive glue have a greater influence on the STZ ratio. To ensure that the resistance strain gauge has excellent strain transfer performance and low hysteresis, it is recommended that the paste thickness should be strictly controlled, and the STZ ratio should be less than 10%. Moreover, the STR strongly depends on the length and width of the sensitive grids.
Highlights
A strain gauge is known to produce resistance change due to the induced strain by the applied external loading, which is often used to measure the force, displacement, vibration, associated with the temperature, humidity, and acceleration [1,2,3]
Following the above results in theory, we investigated the strain transfer characteristics of the resistance strain-type transducer with the proposed four-layer and two-glue (FLTG) model
In the FLTG model, sensitive grids are made of Constantan; the film substrate layer and the cover layer are polyimide; the ground adhesive glue and upper glue are epoxy resin; and the elastomer material is alloy steel
Summary
A strain gauge is known to produce resistance change due to the induced strain by the applied external loading, which is often used to measure the force, displacement, vibration, associated with the temperature, humidity, and acceleration [1,2,3]. The loading experiment verified the significance of the shear lag theory for the calculation of the strain transfer coefficient [11] We applied this theory to study the resistance strain-type transducer. The parameters of polymer and metal materials, and the geometrical dimensional sizes have been taken into account in the extended theory This theory helps to understand the shear stress distribution and the axial strain distribution within the sensitive grids and the coating layer. The STR describes the energy percentage transferred to the sensitive grids from the elastomer-sensitive host material This property is determined by the structural parameters, including the bonding length, film thickness, and elastic modulus of each layer [12]. From the view of the strain distribution along the sensitive grids, the qualitative conclusions for the strain transfer characteristics were drawn
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