Bridging Finite Element and Deep Learning: High-Resolution Stress Distribution Prediction in Structural Components

Hamed Bolandi, Xuyang Li, Talal Salem, Vishnu Boddeti, Nizar Lajnef
Frontiers of Structural and Civil Engineering 2022 .


Finite-element analysis (FEA) for structures has been broadly used to conduct stress analysis of various civil and mechanical engineering structures. Conventional methods, such as FEA, provide high fidelity solutions but require solving large linear systems that can be computationally intensive. Instead, deep learning (DL) techniques can generate solutions significantly faster than conventional run-time analysis. This can prove extremely valuable in real-time structural assessment applications. Our proposed method uses deep neural networks in the form of convolutional neural networks (CNN) to bypass the FEA and predict high-resolution stress distributions on loaded steel plates with variable loading and boundary conditions. The CNN was designed and trained to use the geometry, boundary conditions, and load as input to predict the stress contours. The proposed technique’s performance was compared to Finite-Element simulations using a partial differential equation (PDE) solver. The trained DL model can predict the stress distributions with a mean absolute error of 0.9% and an absolute peak error of 0.46% for the Von-Mises stress distribution. This study shows the feasibility and potential of using the DL technique to bypass FEA for stress analysis applications.