I think what people often forget when they are performing a linear static analysis, is that when they go beyond material yield strength anywhere in the design, a re-distribution of stress will occur which can only be captured by a nonlinear analysis. There are also fundamental concepts that you need to understand in order to get accurate results. Fundamental concepts for linear static analysis
Perhaps only you know what the correct boundary conditions and valid assumptions are that we could make. If you ask someone: “Are there any mistakes?” only you, the engineer, know what type of failure you are solving for. You should either simulate all different modes of failure or do some experiments in the lab to gain a better understanding of which failure modes to rule in or out. If you do not know which failure mode you have to pursue, you have 2 option. A static simulation analyzing strength does not reveal much about a fatigue failure. However, you need to make sure that the type of stress simulation you run corresponds to the mode of failure you are observe or expect in reality.Ī linear analysis is only good as long as the underlying linearity assumptions are satisfied. Sometimes, the question of accuracy is not based on the methodologies or program implementation and capabilities, but on a particular problem in mind.
How can someone external know if it’s right or wrong? A linear analysis The answer to this question would be: “I might be able to find some mistakes but only you (as you the engineer) are in a position to catch them all.” There are some cases where users make mistakes by applying twice the load or perhaps the mistake is in the material’s properties, thickness, etc. What’s more, I also have come across: “Did I make any mistakes in my study?” This is the same general idea but slightly different flavor.
They all are valid questions to respond to the original question if you ask me.
Although I’ve been told it’s not good to answer a question with another question, sometimes it’s necessary.īefore I answer that question, I would ask: “With respect to what? With respect to input data? Real life of the product? Test data? Regulation standard? Or perhaps QA measure?” What s more, there are so many questions I could keep asking. I’ve been working in the stress simulation industry for a few years now and this is a question that I’ve been asked rather frequently.
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