曲拐弯扭组合变形是在研究材料力学过程中常见的一种受力结构，因此编辑曲拐弯扭组合变形的强度校核及设计求解器是一种很必要地方法，这样可以减少以后解决这类问题的工作量。在研究弯扭组合问题时最常用的方法是运用第三、第四强度理论进行强度校核，在设计曲拐杆的直径是同样可利用第三、第四强度理论反推出直径的求解式。在本程序中无论是强度校核还是设计都有运用第四强度理论，利用第四强度理论的求解结果相对保守，但是会更加安全。-Qu bend and torsion of mechanics of materials in the course of a common force structure, so edit the song bend and torsion of the strength check and design solver is a very unnecessary way, thus reducing the future to address these workload issues. The problem of torsion at the most common method is to use the third and fourth strength theory to check the strength, the design of crankshaft rod diameter is able to use the third and fourth strength theory for solving the diameter of anti-launched type. In this process, whether the design strength check or have the use of the fourth strength theory, using results of the fourth strength theory for solving relatively conservative, but it will be more secure.