Exercise 5: Window Impact - 1 - Exercise 5: Window Impact. In this exercise, we simulate the impact of a 2”x4” beam upon an impact resistant window. In coastal areas that are prone to hurricane damage, windows such as these are used to minimize possible damage from air-borne debris. The image below illustrates the analysis setup. A 2”x4” beam is given an initial velocity of 60mph and directed towards the window. Ideally, the beam will bounce off the window with little or no damage. However, as will be seen in this analysis, this is a difficult proposition that requires a great deal of engineering effort. There are many possible variations on the impact. The beam may be tumbling or rolling. It may also impact the window at a wide range of angles. A tool such as Ansys/LS-Dyna allows the analysis of a large combination of variables without resorting to expensive and time-consuming testing. It is important to remember that the proper design of these windows can greatly help prevent the loss of life or property during a hurricane. Exercise 5: Window Impact - 2 - The mesh used in this example is illustrated below. Wall Window Frame 2”x4” Wooden Beam Dummy Exercise 5: Window Impact - 3 - Summary of Steps: 1. Launch Ansys/LS-Dyna 1.1. Launch ANSYS using your Start menu 2. Setup 2.1. Resume Database 2.2. Set LS-Dyna Preferences 2.3. Plotting Controls 2.4. Define Element Types 2.5. Define Real Constants 3. Material Properties 3.1. Linear Elastic Properties for Wall 3.2. Plastic Kinematic Plasticity Model for Window Frame 3.3. Plastic Kinematic Plasticity Model for Plexiglass 3.4. Linear Elastic Properties for 2”x4” Wooden Beam 3.5. Rigid Material Properties for Floor 3.6. Rigid Material P...
