The influence of different Cu contents on the graphite morphology,matrix structure and mechanical properties of the heavy section nodular iron was investigated by using a self-developed mini experimental device,which can be used to simulate the cooling environment of the heavy casting,and by adding respectively 0,0.

The paper is about how to obtain the densified structure of heavy-wall nodular iron castings under the condition of gravity foundry and to introduce the authors research in this area in detail.

This paper makes the Autofrettage analysis of thick wall spherical shell of linear strength material based on unified strength theory.

This paper presents a new method to calculate the limit load of thick wall cylinder and thick wall spherical shell based on Yus Unified Strength Theory and a Unified solutions are obtained.

Calculation of non-stationary thermal stress of low carbon steel thick hollow sphere based on theory of thermoviscoelastisity under non-constant temperature;

In this paper, the limit analysis of thick hollow sphere is realized by using the Coulomb Mohr yield criterion.

Elastic-plastic Inherent strain method is proposed to simulate the welding of a thick spherical stem bulkhead of a submarine, which eliminates the deficiency of the thermal Elastic-plastic FEM that only suits for small-scale welding calculations.