Analysis Of Stress Due To Interference Fit And Heat Flow In Elastic Mediun Containing Plungers

The interference fit is a widely used connection method in engineering practice.The stress analysis of the interference connection between the rivet,bolt and plate is the basis for further study on the failure load and failure mode of the plate.Plunger type sensor is a kind of sensor widely used in measuring physical quantities such as heat flux and pressure,and the interference fit is one of connecttion modes between the sensor and body material.For heat flux measurement,there are problems of structural matching and thermal matching when the bulk material is inserted with plunger sensors.Structural matching is correlated with the security of the body material,accurate stress analysis is needed.Thermal matching problems can cause heat exchange between the plunger and the bulk material,will result the inaccurate heat flow measurements or complex modifications to measurement results.In this paper,the stress due to interference fit and heat flow in elastic mediun containing plungers are studied,and the interaction between the multi-plungers is discussed in order to provide a valuable reference for the related engineering problems.The main contents are as follows:(1)Interference fit between the plungers and an elastic body with periodicly distributed circular holes is studied,the analytical solutions of the stress and displacement in the plunger and the body material are obtained.The radial stress on the contact surface and the circumferential stress on the hole are discussed,The difference of stress distribution between square and hexagonal holes is compared.(2)Interference fit between plungers and an elastic body with multi circular holes is studied,The influences of physical and geometrical parameters,such as the material properties,hole arrangement,spacing and size of the plungers on the radial and circumferential stresses are analyzed.(3)The thermal contact resistance of the contact surface is studied,and the influences of the contact surface characteristics,such as microhardness,contact pressure,equivalent root-mean-squared(RMS)roughness,equivalent average absolute asperity slope on the thermal contact resistance,are obtained.(4)The heat flux distribution in an body containing multiple plungers is discussed,the effects of different thermal resistance,plunger spacing,size and material on the transverse heat flux distribution are compared.