How to calculate welding temperature field and stress field with ansys command flow

Sub-methods: extended segmentation, image segmentation, free segmentation and adaptive segmentation. Extended grid division can expand two-dimensional grid into three-dimensional grid. Image grid division allows users to decompose geometric models into simple parts, and then select appropriate cell attributes and grid controls to generate image grids. The free grid divider of ANSYS program is very powerful, which can directly divide complex models and avoid the trouble caused by grid mismatch when users divide each part separately and reassemble. Adaptive mesh generation means that after generating a solid model with boundary conditions, the user instructs the program to automatically generate a finite element mesh, analyze and estimate the discrete error of the mesh, then redefine the mesh size, and then analyze, calculate and estimate the discrete error of the mesh again until the error is lower than the user-defined value or reaches the user-defined solution number. On the left and right sides of the plate, the center distance between the two bolt holes on the same side of the rib plate is 38mm, the center distance between the bolt hole and the outer edge of the base and the rib plate is 19mm, the center distance between the bearing hole and the upper surface of the base is 44.5mm, the thickness of the rib plate is 3mm, and the radius of the inner and outer holes of the bearing hole is 22mm and 25mm respectively.

The role of sand mold in the whole casting process is self-evident, and it needs to refer to the actual situation in the design process. At present, many manufacturers rely on experience to design. According to the actual situation, due to the temperature change during the previous pouring, the corresponding expansion and compression will occur, which is the linear expansion phenomenon. Its change is the volume change caused by temperature change under a certain pressure value, that is, it is expressed by thermal expansion coefficient. In the above figure, the thermal expansion coefficient increases with the increase of temperature, and the linear expansion coefficient increases fastest when it is 0-200, slightly slower when it is 200- 1000, and the linear expansion coefficient increases slowest after 1000.

Sand casting is a traditional casting method, which is suitable for producing various shapes, sizes, batches and various commonly used alloy castings. The relationship between sand mold parameters is shown in the following figure. Elastic modulus can be regarded as an index to measure the difficulty of elastic deformation of materials. The greater the value, the greater the stress that causes elastic deformation of the material, that is, the greater the stiffness of the material, that is, the smaller the elastic deformation under a certain stress.

Note: Also known as Young's modulus. One of the most important and typical mechanical properties of elastic materials. It is a manifestation of the difficulty of elastic deformation of objects. In the graph obtained above, the Young's modulus shows a similar linear decline curve with the change of temperature. There is a temperature difference between an object or a system, which will lead to heat conduction. The temperature field distribution inside the object determines the speed of heat conduction. There are many kinds of heat conduction in practice, and its laws have certain research value and are the basis of thermal stress analysis. As can be seen from the figure, the density of the castings studied is the same and will not change. For the actual situation, the whole process of casting from high-temperature liquid to solidification cooling is particularly complicated, which belongs to a high-temperature, dynamic and instantaneous change process. But for the convenience of research, it must be idealized and the density can be set as a constant. This research can be carried out under ideal conditions to obtain theoretical results. According to its heating and stress conditions,