Automated Stress Singularity Detection in 3D CAD Models
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Solution Overview
Problem
Stress singularity in finite element analysis (FEA) simulations often leads to numerical errors, making it difficult for non-expert users to determine accurate simulation results, as stress values diverge rather than converge with refined mesh elements, requiring advanced technical support and time-consuming manual adjustments.
Innovation Solution
A computer-implemented method to automatically detect potential areas of high stress, refine the finite element mesh, and suggest modifications to eliminate stress singularity, such as removing sharp angled geometry or changing loads, integrated with CAD systems to provide user-friendly guidance and automatic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mesh is refined to improve accuracy, then the stress calculation precision improves, but stress singularity causes the stress to diverge rather than converge
Solution Approach 1:
The patent detects stress singularity (a harmful numerical error) and converts it into a beneficial diagnostic tool by identifying and highlighting the location and cause of the singularity, enabling users to understand and correct the underlying geometric or loading issues that caused the divergence
Solution Approach 2:
The patent introduces an intermediary detection and analysis mechanism that sits between the mesh refinement process and the stress calculation, identifying stress singularity conditions before they corrupt the results, and providing guidance on how to resolve them
2Measurement precision
If automatic mesh refinement is applied to reduce problem difficulty, then the FEA analysis accuracy improves, but the complexity of identifying and resolving stress singularity increases for non-expert users
Solution Approach 1:
The patent enables the FEA system to automatically detect, diagnose, and provide solutions for stress singularity issues without requiring user expertise in FEA theory, making the system self-diagnosing and self-correcting for common numerical errors
Solution Approach 2:
The patent implements a feedback mechanism that automatically analyzes stress results, detects singularity conditions, and provides actionable guidance back to the user, creating a closed-loop system that learns from and corrects its own numerical errors
3Measurement precision
If mesh refinement is performed to achieve convergence, then the stress accuracy improves, but the time required for analysis increases due to iterative refinement
Solution Approach 1:
The patent performs preliminary detection of stress singularity conditions before full mesh refinement is executed, allowing the system to identify problematic areas upfront and apply targeted corrections, avoiding unnecessary iterative refinement of already-identified singularity regions
Data Source
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AI summary
A computer-implemented method and system automatically detects stress singularity in a three-dimensional (3D) computer-aided design (CAD) model. A potential area of high stress is detected. A finite element mesh of the 3D CAD model is refined, at least in the potential area of high stress, after which, whether the high stress value converges is determined. A user is alerted that the potential area of high stress is an area having one or more elements of stress singularity. Suggestions are made regarding how to eliminate the stress singularity and the user is enabled to modify the design of the 3D CAD model to eliminate the stress singularity.