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Title: COSMOSWorks Instructor Guide 1 COSMOSWorks Instructor Guide • C. Crane • 8 Apr 2009 2 What is COSMOSWorks? • COSMOSWorks is a design analysis software that is fully integrated in SolidWorks. • COSMOSWorks simulates the testing of your models prototype in its working environment. It can help you answer questions like how safe, efficient, and economical is your design? • COSMOSWorks is used by students, designers, analysts, engineers, and other professionals to produce safe, efficient, and economical designs.

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3 The Finite Element Method • Analytical solutions are only available for simple problems. They make many assumptions and fail to solve most practical problems. • COSMOSWorks uses the Finite Element Method (FEM). Analysis using the FEM is called Finite Element Analysis (FEA) or Design Analysis. Easy-pro Builders Estimator there. • FEA is very general. It can be used to solve simple and complex problems. • FEA is well-suited for computer implementation.

It is universally recognized as the preferred method of analysis. 4 Main Concept of Design Analysis • The FEM replaces a complex problem by many simple problems.

It subdivides the model into many small pieces of simple shapes called elements. CAD Model CAD Model Subdivided into Small Pieces 5 Main Concept of Design Analysis • The elements share common points called nodes.

The behavior of these elements is well-known under all possible support and load scenarios. • The motion of each node is fully described by translations in the X, Y, and Z directions.

These are called degrees of freedom (DOF). Each node has 3 DOF. 6 Main Concept of Design Analysis • COSMOSWorks writes the equations governing the behavior of each element taking into consideration its connectivity to other elements. • These equations relate the unknowns, for example displacements in stress analysis, to known material properties, restraints and loads.

• Next, the program assembles the equations into a large set of simultaneous algebraic equations. There could be hundreds of thousands or even millions of these equations. 7 Main Concept of Design Analysis • In static analysis, the solver finds the displacements in the X, Y, and Z directions at each node. • Now that the displacements are known at every node of each element, the program calculates the strains in various directions. Strain is the change in length divided by the original length. • Finally, the program uses mathematical expressions to calculate stresses from the strains. 8 Types of Analysis Static or Stress Analysis • This is the most common type of analysis.

It assumes linear material behavior and neglects inertia forces. The body returns to its original position when loads are removed.

• It calculates displacements, strains, stresses, and reaction forces. • A material fails when the stress reaches a certain level. Different materials fail at different stress levels. With static analysis, we can test the failure of many materials. 9 Types of Analysis Nonlinear Static Analysis • Use nonlinear analysis, when at least one of the following conditions applies • The stress-strain relationship of the material is not linear. • Induced displacements are large enough to change the stiffness. • Boundary conditions vary during loading (as in problems with contact).