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Mechanical property upscaling and cross-scale analysis of lunar bricks with sintered regolith simulants
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DOI：10.1007/s11431-025-3345-x.png)
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Abstract
En 中文
Toward the need of evaluating in-situ resource utilization (ISRU) materials in lunar base construction, this study develops a multiscale framework that integrates computed tomography (CT), nanoindentation, grain-based modeling (GBM), and theoretical homogenization to quantify microscale properties and predict macroscopic mechanical behavior. Discrete element methods (DEM), have been widely used to simulate the mechanical behavior of lunar regolith; however, the micro-macro mechanical linkage remains largely unexplored. To address this gap, random GBM models based on the DEM were constructed using CT-derived mineral volume fractions and nanoindentation-informed elastic moduli, enabling simulation of force chain transmission and fracture evolution under uniaxial compression. To account for imperfect interfaces, defect-based corrections incorporating mineral surface area and volume fraction of isolated porosity were introduced into homogenization models. The results show that harder mineral phases, such as pyroxene and olivine, constitute the primary load-bearing network, while feldspar functions as a compliant matrix that accommodates deformation. The macroscopic mechanical response is primarily governed by intrinsic phase-level stiffness, with microstructural features acting as modulators. Reciprocally, variations in sintering conditions influence the spatial distribution of porosity and phase composition, reflecting top-down effects on microstructural development. Through a synergistic combination of modeling and theoretical analysis, this work for the first time establishes a physically grounded and systematic bidirectional linkage between microstructure and macroscopic mechanics, offering a robust framework for nondestructive performance evaluation and the rational design of sintered lunar regolith simulants (LRS) materials with target-specific properties.
Keywords:
extraterrestrial construction
lunar regolith simulant
nanoindentation
grain-based modeling
multiscale analysis
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