Learning Forum

[busraekinci]

Hello, I need a small help to model a hydraulic cylinder for a basic static structural analysis. See the attachment of my cylinder geometry.

One end should be a spherical joint and other one is revolute one. I know the input force which I need to apply. I made the contact bonded between cylinder rod and cylinder tube. However, the solution does not look right. Even the joint force magnitude and direction are not right. Could you give a suggestion to me please?

[peteroznewman]

nI don't design hydraulic cylinders and I don't think you do either. nI know of the type where hydraulic fluid is pumped into the cylinder and the piston displaces to make the component longer.nIf I have a component like this in a complex piece of machinery, I represent it by a very stiff spring.nI can probe the force in the spring to know if I have selected the appropriate size of cylinder from the catalog.nWhat is the goal of your analysis?n

[busraekinci]

Hello Array, No, I do not design hydraulic cylinders. My only goal is to examine this cylinder in terms of strength under a certain 'force' or under a 'force + moment' combination. Just to see strength of cylinder tube and rod. nOne more question: Imagine a cylinder in a mechanism. The cylinder is under a certain force + moment combination. Force is axial due to cylinder's geometry. When I check the Von Mises stress, does the result represent only 'force effect' or 'force + moment' effect together? What is the concept behind Von Mises stress exactly?nThanks very much! n

[peteroznewman]

nA hydraulic cylinder with a revolute joint at one end and a spherical joint at the other end will only see axial force. There will be no moments introduced.nI recommend you take some of the free courses such as: /courses/index.php/courses/stress-analysis/ and /courses/index.php/courses/stress-and-local-equilibrium/n

[busraekinci]

Thanks a lot ! It is gonna be very helpful to take these courses. Also thank you so much for the knowledge you provide!