Basic Analysis Guide ANSYS phần 4

Đối với một phân tích phi tuyến hoặc thoáng qua, bạn cần phải xác định số lượng substeps được thực hiện trong vòng một bước tải. Điều này được thực hiện như sau: : Menu chính Preprocessor tải Tải Bước opts Thời gian | . Example Initial Stress Problem Using the 1ST File You can provide additional parameters via the ATTR VALUE line in the . 1ST file. Supported parameters are CSYS and DTYP. Issue a CSYS VALUE command to specify the coordinate system to be used for the subsequent data supplied in your . 1ST default coordinate system is the global Cartesian system. You can apply initial strain in a similar manner by including DTYP EPEL before the actual initial-state initial-strain date. For example dtyp epel all all all all 0 0 0 0 0 applies an initial strain of ex for all elements in the database. You can insert comments and other non-analysis information in the . 1ST file by preceding them with an exclamation mark . . Using Coordinate Systems with Initial State The INISTATE command provides options for specifying data in coordinate systems other than the material and element coordinate systems. To define the coordinate system issue this command INISTATE SET CSYS CSID Valid values for CSID are MAT material or ELEM element or any user-created coordinate system. Shell elements support only material and element coordinate systems. Link elements support only element coordinate systems. The default coordinate systems are 0 global Cartesian for solid elements and ELEM for shell beam and link elements. . Example Problems Using Initial State This section provides examples of typical initial state problems as follows . Example Initial Stress Problem Using the IST File . Example Initial Stress Problem Using the INISTATE Command . Example Initial Strain Problem Using the INISTATE Command . Example Initial Plastic Strain Problem Using the INISTATE Command . Example Initial Stress Problem Using the IST File The following example initial stress problem shows how to define an initial stress file and use the INISTATE READ command to read the data into your analysis. The following file contains the initial stresses to be read into ANSYS. Each .