lecture2-线性静态分析.pptVIP

Introduction to Abaqus/Standard and Abaqus/Explicit 习题2: 悬臂梁的线性静态分析 习题任务 使用多工况分析的办法，分析梁的弯曲响应。 比较使用单个分析步的多工况分析和多个分析步的单工况分析，得到的求解和分析时间的不同。 Now let’s talk about multiple load case solution. Many components require analysis under different types of loads. For example, a fatigue analysis of an airframe requires the designer to consider take-off, climb, cruise, decent, landing, and taxiing loads – to name a few – on the airframe. The solution of the airframe to each of these loads is combined in a fatigue post-processor to estimate the fatigue life of the frame. In previous versions of Abaqus, each load could only be solved in its own perturbation step requiring sequential solution of the load vectors one after the other. Now, in Version 6.3, multiple load cases can be solved simultaneously in a single step with the new multiple load case solution capability. Here’s an example of an agricultural implement attached to and towed behind a tractor through a 3-point hitch. The purpose of the hitch is to transfer towing loads to the implement, but otherwise to allow the implement to float and move more or less independently of the tractor. It is a very flexible connection. Consequently, the loads on the implement are not well define, but are a combination of many different types of loads. Here’s a quick look at the input syntax for the multiple load case capability. Within a single static step, you stack each load case in sequency, one after another, between *load case and *end load case keywords. It is important to note that although the load cases are defined in sequence. Each load case is independent from the other load cases. They are not history dependent as the loads within sequential steps are. The load cases are all solved simultaneously from the base state provided by the previous nonlinear solution history, if any. This example also highlights that boundary conditions may change from load case to load case by simply redefining the bcs, as needed, in each