Lattice Structure Design for Additive Manufacturing Stress Reduction
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Solution Overview
Problem
Multi-material mechanical functional members face stress concentration and increased manufacturing costs due to material adhesion, while achieving desired mechanical properties and lightweight structures is challenging with conventional methods.
Innovation Solution
A method in additive manufacturing involves dividing objects into portions, analyzing mechanical properties, constructing a unit cell library, selecting appropriate lattice structures for each portion, and assembling them into a 3D model using the same material, avoiding internal bonding and stress concentration through lattice structures with controlled mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multi-material mechanical functional members are used to achieve different mechanical properties in different portions, then the mechanical properties can be optimized, but stress concentration occurs due to material adhesion and manufacturing costs increase
Solution Approach 1:
The patent changes the material parameter from multi-material to single-material by using lattice structures with different unit cell types. Different portions of the mechanical functional member use different lattice unit cell types (e.g., gyroid, diamond, cubic structures) to achieve different mechanical properties while maintaining material homogeneity, thereby avoiding stress concentration at material interfaces.
2Strength
If multi-material mechanical functional members are used to achieve different mechanical properties in different portions, then the mechanical properties can be optimized, but manufacturing costs increase
Solution Approach 1:
The patent transforms the manufacturing approach by changing from multi-material printing to single-material printing with variable lattice structures. This parameter change simplifies the manufacturing process, reduces material compatibility requirements, and lowers manufacturing costs while still achieving different mechanical properties through lattice unit cell type variation.
3Weight of moving object
If lattice structures are used to replace solid structures, then weight is reduced and material utilization is improved, but mechanical properties must be carefully controlled to meet product requirements
Solution Approach 1:
The patent applies local quality by assigning different lattice unit cell types to different portions of the mechanical functional member based on their specific mechanical property requirements. Each portion's lattice structure is locally optimized to meet its functional demands while maintaining overall structural integrity and weight reduction.
Data Source
AI summary
A method for forming a multi-material mechanical functional member in additive manufacturing. The method includes the following steps: S1: dividing an object to be formed into a plurality of portions, analyzing and measuring mechanical properties of each portion, and constructing a unit cell library; S2: forming a lattice structure by using a unit cell structure in the unit cell library to obtain the lattice structure corresponding to each portion; S3: selecting a raw material of the lattice structure, measuring and comparing mechanical properties of each lattice structure with the mechanical properties of each portion of the object to be formed, where when the mechanical properties of each portion are satisfied, the lattice structure is the required lattice structure, otherwise, step S2 is repeated; and S4: forming a three-dimensional model by a method of additive manufacturing to accordingly obtain the required object to be formed.