Additive Manufacturing Distortion Simulation Using Octree Mesh Layers
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Solution Overview
Problem
Additive manufacturing processes, such as laser beam melting, often result in distorted parts due to thermal stresses caused by rapid heating and cooling, which existing technologies fail to accurately predict and mitigate.
Innovation Solution
The system generates an octree mesh for part geometry, simulates material deposition layer by layer, and uses thermal analysis and finite element methods to predict structural distortion and residual stress by determining force vectors and stiffness representations, allowing for layer-by-layer distortion and stress accumulation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If laser beam melting is used to create solid geometry from metallic powder, then additive manufacturing capability is achieved, but thermal stresses cause distortion in the resultant solid geometry
Solution Approach 1:
The system performs preliminary thermal and structural analysis simulations before actual manufacturing to predict distortion and residual stress. This allows pre-compensation of the digital model to counteract expected thermal effects, preventing distortion before it occurs in the physical part.
Solution Approach 2:
The system uses iterative simulation feedback to refine the manufacturing process. Thermal and structural analyses are performed on each layer, and the results feed back into adjusting subsequent layer parameters and compensation strategies, enabling real-time optimization during the manufacturing process.
2Productivity
If rapid heating and cooling is used in the additive manufacturing process, then manufacturing speed is improved, but thermal stresses increase causing distortion
Solution Approach 1:
The system performs preliminary thermal analysis to predict temperature distributions and thermal stress patterns before manufacturing. This allows optimization of heating and cooling rates to maintain productivity while minimizing thermal stress accumulation through pre-planned parameter adjustments.
Solution Approach 2:
The system dynamically adjusts process parameters such as laser power, scanning speed, and hatch spacing based on simulated thermal stress predictions. These parameter changes allow maintenance of rapid manufacturing speeds while controlling thermal stress within acceptable limits through optimized process conditions.
3Adaptability or versatility
If layer-by-layer material deposition is used, then complex geometries can be created, but cumulative distortion increases with each layer
Solution Approach 1:
The system divides the manufacturing process into discrete layer segments, performing thermal and structural analysis on each layer individually. This segmentation allows tracking and compensation of cumulative distortion effects as they develop layer by layer, maintaining geometric accuracy throughout the build process.
Solution Approach 2:
The system performs preliminary analysis of cumulative thermal and structural effects across multiple layers before complete manufacturing. This allows prediction and compensation of cumulative distortion patterns that develop as layers are added, enabling pre-adjustment of the digital model to counteract expected cumulative effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively predicts and mitigates structural distortion and residual stress in additive manufactured parts, improving the accuracy of part geometry creation and reducing the likelihood of defects like blade crashes and post-processing distortions.
Implementation Method 1
a laser emitting device 102 and a powder deposition device 104 that are controlled by a computer system (not shown) based, for example, on a computer-aided design (CAD) file, to generate a solid geometry 106 from a metallic powder (referred to as the powder feedstock). In operation, the solid geometry 106 is created by patterning a layer of the powder feedstock using the powder deposition device 104, melting the powder layer with a beam emitted by the laser emitting device 102
Implementation Method 2
melting the powder layer with a beam emitted by the laser emitting device 102, allowing the melted layer to cool into a solid
Implementation Method 3
the resultant solid geometry 106 created using an LBM (or other similar) process is often distorted in comparison to the intended design as a result of thermal stresses caused by the rapid heating and cooling process
Data Source
AI summary
Example systems and methods are disclosed for predicting structural distortion in a part geometry created by an additive manufacturing process. An octree mesh is generated for a part geometry based on a voxel file having voxel layers. The octree mesh is coarsened, a representation of stiffness for one of the voxel layers is generated based on the coarsened octree mesh, a force vector is determined based, in part, on the coarsened octree mesh and data from a thermal analysis of the part geometry, and a layer distortion is determined based, in part, on the force vector and the representation of stiffness. The structural distortion in the part geometry is predicted based on the layer distortion.