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Submodeling Technique in Stress Analysis

Submodeling Technique in Stress Analysis

Abstract

This technical paper explains the information about the submodel techniques used in the stress analysis by Finite Element Analysis. It highlights the necessity of submodels in stress analysis to  reduce the run time which in turn influences the budget and deadline of the entire product design and development cycle. Submodel techniques are introduced in the stress analysis because of the limitation of the full model to capture the correct stress concentrations at critical locations. If the critical location is known prior to analysis, it is always recommended to include the refined mesh at critical locations embedded in the full global model itself. This may require sophisticated high end computing systems to optimize the run time.

This whitepaper explains the basic process involved along with different types of submodels used in the stress analysis of the component or entire systems. This paper also explains the reason behind the selection of different types of sub models based on the critical locations, attenuation length for the cut boundary locations of the submodel and some of the checks to ensure that the submodel results are accurate.

Excerpts from the Paper
In a typical stress analysis of a component the model size is dependent up on the program requirement, available budget and computing facilities. The time to build the model is linearly related to the model size. The complexity of the model and degrees of freedom present in the model is nonlinearly related to the time taken to complete the analysis. The material nonlinearity and consideration of friction at the interfaces further complicates the analysis. The assumptions in the model may further reduce the scope of the analysis. In such cases submodels are very handy to speed up the solution time and obtaining the accurate results at the critical locations.

Submodels allow the reduction of model size in the global full model hence reducing the analysis time. Submodels are constructed and run at locations of the global  full model where mesh is not fine enough to capture the accurate stresses. Extreme care should be taken to ensure that the source of  geometry taken for the submodel is same as that used in the global model. As far as possible the features at the critical locations such as fillets, chamfers and blends should be present in the global model.

 

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