In this model,the equivalent thermal capacity method was used to deal with the influence of latent heat on the temperature field and the transformation stress resulted from phase transformation was taken into account using the equivalent linear expansion coefficient method.

On considering the problems of numerical calculation of stress fields during quenching, the quenching stress fields in the 40Cr steel cylinder have been analyzed with the method of equivalent linear expansion coefficient.

Measuring coefficient of linear expansion of metal with optical fiber displacement sensor;

Measuring coefficient of linear expansion of metal and density of liquid with AC bridge and Joly spring balance;

The anharmonic effect of atomic vibration taken into account and from the potential energy which reacts each other among atoms, Boltzmann statistical principle used, the relation formula of temperature and the distance change between atoms and coefficient of linear expansion is derived.

Non-contact measurement of linear expansion coefficient of metal based on optical fiber technology;

Improved measurment of linear expansion coefficient of solid based on the electrothermal method;

Improvement of the apparatus for measuring linear expansion coefficient of solid;

The Elemental Conducting Matrix Adjustment Method was simplified and improved, and the Equivalent Penetration Coefficient Method was proposed.