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1. You can create your own ABC PC material with all the mechanical properties, you can get those info. from www.matweb.com
2. You can find the COSMOS materials.sldmat file under .....\ SolidWorks\COSMOS\CWLang\English, and then you can edit this XML format file with Xml editor or just Notepad.
That is ok but beware that yielding phenomenon is primarily associated with metals -primarily because it marks nearly the end of linearity just before the metal goes into a 'plastic' state. This is of course the realm of applicability for linear analysis. Many plastics on the other hand can strain very, very far and perhaps even in a nonlinear fashion prior to failure. Many have a failure indicator known as "Maximum strain to failure" which is typically posted by the manufacturer. Once you obtain that number, you could use it to define failure along with a nonlinear stress-strain curve (also from the manufacturer) and conduct COSMOSWorks Nonlinear analysis and plot the Normal, Equivalent, or Shear strain in COSMOSWorks at full load. Hope this helps.