Inner conical elastomer for strain force transducer, and optimization method for inner conical elastomer

Abstract

The invention provides an inner conical elastomer for a strain force transducer. The inner conical elastomer comprises a cylindrical base body; the upper part of the base body is provided with a conical concave part; the bottom of the conical concave part is provided with a central hole; and the conical surface of the conical concave part is provided with a strain gauge. The optimization method for the elastomer comprises the following steps of: estimating an initial size; calculating stress of the elastomer under the action of the axial force of a bolt by a finite element method, and adjusting the cone angle of a model until stress on the inner conical surface is distributed uniformly; adjusting the thickness of the base body under the condition of not changing the cone angle to ensure that the stress level on the conical surface meets the requirement; and rounding the model size obtained through finite element calculation, wherein the rounded model size is used as the final size of the elastomer. The inner conical elastomer is a simple revolution solid, and is high in processing and heat treatment manufacturability; the stress of the adhesion part of the strain gauge is distributed uniformly; and the accuracy of the adhesion position of the strain gauge is not required. The axial size of the elastomer is smaller than that of a spoke elastomer, and the elastomer is more suitable for measuring the axial force of the bolt.

Description

technical field [0001] The invention belongs to the technical field of mechanical testing and measurement, and relates to an inner tapered elastic body of a strain type force sensor, and also relates to an optimization method of the inner tapered elastic body. Background technique [0002] As a commonly used connecting piece, bolts are widely used in engineering. The axial pretightening force of bolts has a great influence on its performance and life, and even the performance and life of the connected parts. In the study of static and dynamic characteristics of bolted joints and large-area contact joints loaded by bolts, accurate measurement of bolt axial preload is one of the foundations of the entire study. The commonly used measurement techniques for the axial pretightening force of bolts include torque wrench method, resistance strain gauge method, ultrasonic stress measurement method, etc. [1] . [0003] Torque wrench method is the most widely used method in engineeri...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an inner tapered elastic body of a strain gauge force sensor, which solves the problem that the error of the bonding position of the strain gauge of the existing spoke elastic body will cause a relatively large difference in sensor sensitivity, and the structure of the spoke elastic body is complicated , a more difficult problem to process

Images