A method for predicting porosity and shrinkage of sinter-based additive manufacturing graded porous lattice

By establishing a dual-pore model and a total strain rate equation, the problem of predicting pore distribution and shrinkage deformation in sintered additive manufacturing was solved, and the precise manufacturing of hierarchical porous lattice components was realized.

CN122157889APending Publication Date: 2026-06-05SUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUZHOU UNIV
Filing Date
2026-01-07
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing sintering-based additive manufacturing technologies cannot accurately predict the pore distribution and shrinkage deformation of hierarchical porous lattice components during high-temperature sintering, resulting in a bottleneck in improving product structure accuracy and yield.

Method used

A dual-pore model is established, which decomposes the pore system into micro-relative density and macro-relative density. The model is then solved iteratively using the total strain rate equation and the finite element analysis framework to predict hierarchical porosity and shrinkage deformation.

Benefits of technology

It enables accurate prediction of pore distribution and three-dimensional shrinkage deformation of hierarchical porous lattice components, improving manufacturing success rate and product accuracy.

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Abstract

The present application relates to the technical field of additive manufacturing, and discloses a sintering-based additive manufacturing hierarchical porous lattice pore and shrinkage prediction method, comprising: establishing a double-pore model to decompose the pore system of the lattice component into micro and macro relative densities; establishing a total strain rate equation to decompose the total strain rate of the lattice component into strain rate components; wherein the strain rate components are determined according to the densification rate of the micro relative density and the constitutive parameters; establishing a micro relative density evolution equation, and iteratively coupling the total strain rate equation and the micro relative density evolution equation to obtain the node displacement field and the micro relative density field, and determine the evolution of the macro relative density; and according to the micro relative density field and the evolution result of the macro relative density, the prediction result of the hierarchical pore and three-dimensional structure shrinkage deformation is obtained. The present application can be directly used for geometric pre-compensation of the additive manufacturing green body, and improves the manufacturing success rate and product precision of the lattice component.
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