Weak Material Phase via Distanced Beams in Additive Manufacturing
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Solution Overview
Problem
Current additive manufacturing techniques face challenges in producing functionally graded objects with varying mechanical properties using homogeneous materials, as thermal history variations during processing can result in disparate material properties across voxels, making it difficult to achieve consistent mechanical properties like Young's modulus and strain tolerance.
Innovation Solution
The method involves embedding fine solid features to create a weak material phase by printing distanced beams between solid material phase regions, allowing for the manipulation of mechanical properties through geometrical design without changing the base powder or manufacturing procedure, thereby homogenizing the weak material phase into a solid with distinct properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If homogeneous material is used in additive manufacturing, then manufacturing simplicity is maintained, but mechanical property uniformity deteriorates due to thermal history variations
Solution Approach 1:
The patent applies local quality by creating functionally graded materials where different regions of the object have different material compositions. Specifically, it varies the concentration of reactive powder particles throughout the build volume, allowing each region to develop distinct mechanical properties (such as Young's modulus and strain tolerance) based on its local composition, thereby achieving mechanical property uniformity within each region while maintaining manufacturing simplicity through a single additive manufacturing process
Solution Approach 2:
The patent employs parameter changes by systematically varying the concentration of reactive powder particles in different regions of the object. This compositional parameter variation occurs during the additive manufacturing process, where the concentration is adjusted to create regions with different mechanical properties, thus resolving the contradiction between using homogeneous materials and achieving uniform mechanical properties across the entire object
2Adaptability or versatility
If thermal history variations are allowed during processing, then manufacturing flexibility is improved, but material property consistency deteriorates
Solution Approach 1:
The patent uses parameter changes by varying the concentration of reactive powder particles to compensate for thermal history variations. Different regions experiencing different thermal histories are assigned different particle concentrations, which adjusts their final mechanical properties to achieve overall consistency, thus maintaining both manufacturing flexibility and material property consistency
Solution Approach 2:
The patent implements feedback by using thermal history information to determine the appropriate reactive powder particle concentration for each region. The thermal history experienced by each voxel during manufacturing is considered when setting the material composition parameters, creating a feedback loop that ensures consistent mechanical properties despite variations in processing conditions
Data Source
AI summary
Examples of methods are described. In some examples, a method may include printing a first solid material phase region. In some examples, the method may include printing a second solid material phase region distanced from the first solid material phase region. In some examples, the method may include printing a plurality of distanced beams, each having a thickness that is not more than one millimeter, to form a weak material phase region between the first solid material phase region and the second solid material phase region. In some examples, the weak material phase region has a volumetric density less than one.