Hello:
I have recently been using CosmosWorks to analyze stress thein aceramic component of an assembly. When I walk throughthedesign check wizard I initially select the Mohr-Coulomb stressandthe part I am concerned with. In the next step (2 of 3)Iselect the units; then select the ultimate strength for thetensileand compressive stress limits. The ultimate tensilestrengthfor my material is 520 psi and the ultimate compressivestrength is1200 psi, which shows up in the lower windowcalled Material involved. The next window down isMax stress in the model. In it, the firstprinciplestress is shown to be 407.2 psi and the 2nd principlestress isshown to be 1024 psi. When I check the 1st principlestressin the model it gives me a max of 192 psi and -407.2psi. When I check the 3rd principle stress in the model itgivesme a max of -92 psi and min of -1024 psi. Then in step 3of 3the factor of safety is shown to be 0.366683, not good. Ibelieve there is some error in cosmos or in what I am doingthatdoesn't account for compressive stress in the model. Ibelieve that the model is primarily compressed, I verifiedthiswith a check of stress directions on elements by using thevonmises stress and tensor option in the display type for thestressplot. all looked to be compressive. Anyway Ibelievethe value for the max first principle stress should be 192psi andthe value for the min 2nd principle stress should be -1024psi. According to that, the part doesn't fail becauseitstensile stress never goes over 520 psi and its compressivestressnever goes below 1200 psi. Can someone tell mewhat I amdoing wrong?SolidworksSimulation
I have recently been using CosmosWorks to analyze stress thein aceramic component of an assembly. When I walk throughthedesign check wizard I initially select the Mohr-Coulomb stressandthe part I am concerned with. In the next step (2 of 3)Iselect the units; then select the ultimate strength for thetensileand compressive stress limits. The ultimate tensilestrengthfor my material is 520 psi and the ultimate compressivestrength is1200 psi, which shows up in the lower windowcalled Material involved. The next window down isMax stress in the model. In it, the firstprinciplestress is shown to be 407.2 psi and the 2nd principlestress isshown to be 1024 psi. When I check the 1st principlestressin the model it gives me a max of 192 psi and -407.2psi. When I check the 3rd principle stress in the model itgivesme a max of -92 psi and min of -1024 psi. Then in step 3of 3the factor of safety is shown to be 0.366683, not good. Ibelieve there is some error in cosmos or in what I am doingthatdoesn't account for compressive stress in the model. Ibelieve that the model is primarily compressed, I verifiedthiswith a check of stress directions on elements by using thevonmises stress and tensor option in the display type for thestressplot. all looked to be compressive. Anyway Ibelievethe value for the max first principle stress should be 192psi andthe value for the min 2nd principle stress should be -1024psi. According to that, the part doesn't fail becauseitstensile stress never goes over 520 psi and its compressivestressnever goes below 1200 psi. Can someone tell mewhat I amdoing wrong?SolidworksSimulation
