Automated Anisotropy Setting for Press-Formed Panel Stiffness Analysis
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Solution Overview
Problem
Current CAE analysis methods for press-formed panels using anisotropic metal sheets face challenges in accurately setting anisotropy information and sheet thickness, leading to incorrect stiffness and crashworthiness analysis results due to manual guesswork, which is time-consuming and prone to errors, especially with complex panel shapes and large numbers of elements.
Innovation Solution
A method involving reverse press-forming analysis to automatically set anisotropy information and sheet thickness for each element of the analysis model by acquiring and aligning reference directions and sheet thickness distribution, significantly reducing calculation time and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual guesswork is used to input anisotropy information for each element, then the analysis model can be set up, but the process is extremely time-consuming and error-prone
Solution Approach 1:
The system performs automatic setting of anisotropy information and sheet thickness by utilizing the analysis model itself and reverse press-forming analysis results. The computer automatically calculates reference directions, determines anisotropy information for each element, and sets sheet thickness without requiring manual intervention, making the system self-sufficient
Solution Approach 2:
The patent replaces the manual mechanical process of guessing and inputting anisotropy information with an automated computational system. The computer executes reverse press-forming analysis, automatically calculates reference directions using coordinate transformations, and determines anisotropy information through algorithmic processing, substituting human manual work with computational mechanics
2Productivity
If manual guesswork is used to set anisotropy information, then the analysis can proceed, but the analysis results do not match experimental values
Solution Approach 1:
The patent performs reverse press-forming analysis in advance to obtain the blank shape and sheet thickness distribution before setting anisotropy information. This preliminary action provides the necessary geometric data and reference directions needed for accurate automatic setting of anisotropy information, ensuring both productivity and measurement precision
Solution Approach 2:
The system uses the analysis model and reverse press-forming results as feedback to automatically determine the correct anisotropy information for each element. The computer continuously refines the setting by utilizing the relationship between the blank shape, panel shape, and element orientations, ensuring analysis results match experimental values
3Measurement precision
If reverse press-forming analysis is used to automatically set anisotropy information, then accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent divides the complex task of setting anisotropy information into manageable segments: first performing reverse press-forming analysis to obtain blank shape, then calculating reference directions for each element separately using coordinate transformations, and finally setting anisotropy information element-by-element. This segmentation makes the complex process systematic and computationally manageable
Solution Approach 2:
The analysis program performs multiple functions using the same reverse press-forming analysis results: it obtains the blank shape, determines sheet thickness distribution, calculates reference directions, and sets anisotropy information for all elements. This multi-functionality reduces overall complexity by reusing computational results across different tasks
Data Source
AI summary
A method of setting metal sheet anisotropy information and sheet thickness information for an analysis model of a press-formed panel includes spreading the analysis model of the press-formed panel into a blank shape by analysis of reverse press-forming; acquiring sheet thickness information obtained by the analysis of reverse press-forming; based on a spread-blank-shape and a panel-taking blank shape, acquiring a reference direction of the spread-blank-shape; calculating an angle formed between the reference direction of the spread-blank-shape and each element in the spread-blank-shape, and setting the reference direction for each element of the analysis model of the press-formed panel based on the calculated angle; and setting the sheet thickness information acquired in the sheet-thickness-information acquiring step for each element of the analysis model of the press-formed panel.