The Temperature Field And Stress Finite Element Analysis Of Asphalt Ship With Different Forms Of Bulkhead

As a high value-added transport ship, the science and technology including of asphalt ship is very high, and its manufacturing is difficult. The liquid that asphalt ship loads, which the temperature is usually between 120 to 180 degree Centigrade, high-temperature liquid cargo increase significantly the temperature gradient in double-shell structure, and brings significant additional thermal stress to the hull, or even led to component yield, endanger safety of the structure, therefore, it is very important for asphalt ships to carry out thermal stress analysis.Generally, only bulkhead structure contacts with the goods, and connects to the other components of the hull in the integral cargo tank of asphalt ship. So, the temperature gradient of this area is the largest, and the thermal stress is also the largest. Therefore, groove bulkhead is the main component which is taken the thermo stress analysis taking into account of the thermal stress of the asphalt ship. Groove bulkhead plays a very good role in the release of thermal stress. But is there any difference of different forms of the bulkhead by thermal stress? How much differences can be caused by these different forms? Would this give rise to local component of yield? This is the main aim in this study of this thesis.The development of computer hardware and software technology makes the FEM method of local structure or even the entire vessel to be possible. Since then, the strength analysis of the hull structure had a revolutionary breakthrough. According to various components of the actual situation of the force, were simulated into bar, plate, beam and shell, and other units, the real expression of the various components of the situation by force. Due to the analysis of finite element software, all components of the actual results of the stress and deformation can be obtained. It is the most accurate and comprehensive approach. Finite element method in the calculation of the hull structure has a wide range of applications, but real in the analysis of thermal stress of the ships. This article will be on the basis of previous studies, takes the use of finite element software to analysis the different forms of corrugated bulkhead of the asphalt ship. With this kind of method, the influences of groove bulkhead with temperature and thermal stress will be obvious.First of all, a more in-depth and detailed research in this paper have done based on the basic theory about the temperature field and thermal stress. For example, it describes the details of basic concept of the temperature field and thermal stress; the finite element method of the temperature field and thermal stress; and also the finite element method of bending sheet. And then take a 3500t asphalt-class ship as an example. Due to the large-scale finite element analysis software MSC.Patran & MSC.Nastran, three models with the bulkhead of the groove is in different directions were established, and the other components are the same. Then calculate the temperature field and thermal stress, gather together the three models' results, compare analysis conclusions. The general conclusion about bulkheads made of different forms of asphalt temperature and the ship's thermal stress is obtained. It has a certain reference value in designing of this category.