KLS-1 Lunar regolith simulant was microwave sintered to explore its potential applicability in future lunar construction. The effects of sintering temperature on linear shrinkage, density, porosity, and microstructural, mechanical, thermal properties were investigated. As the increased, shrinkage density increased porosity decreased. Structural evolution samples characterized by scanning electron microscopy X-ray diffraction. Unconfined compressive strength testing showed that mechanical...

The presence of fractures in a rock mass can have substantial influence on its mechanical and hydraulic properties. For many years, computed tomography (CT) scan has been effectively utilized to investigate the internal structures rock. However, quantitative characterization fracture based CT data remains challenging endeavor due inevitable blurry appearance images, complexity patterns heterogeneity host In this study, deep learning-based method is presented for automatically accurately...

Hybrid microwave sintering is considered a promising method to produce densified components using in-situ resources for lunar construction. This study aimed examine the effects of primary parameters on densification, microstructure evolution, and mechanical properties soil simulant analyzed processing-microstructure-properties relationship. The experimental design was based Taguchi method, where temperature, dwell time, heating rate were regarded as factors. Density measurements presented...

The use of materials from the Moon's surface based on In-Situ Resource Utilization (ISRU) is gaining considerable attention as a means constructing infrastructure to sustain human presence there. In particular, sintering lunar regolith appears promising way fabricate surface. This study presents method manufacture homogeneous blocks using simulant. tested simulant, KLS-1, was sintered under diverse conditions in multi-mode microwave furnace. Successful requires sample be heated throughout,...

Abstract A spark plasma sintering (SPS) process has been explored to densify FJS‐lunar soil simulants for structural applications in space explorations. The effect of SPS conditions, such as temperature and pressure, on the densification behavior, phase transformation, microstructural evolution, mechanical properties FJS‐1 have examined by conducting X‐ray diffraction analysis, electron microscopy imaging, nano/micro indentation testing. Test analysis results were also compared from powder...

With the recent discovery of water-ice and lava tubes on Moon Mars along with development in-situ resource utilization (ISRU) technology, planetary exploration has focused rover (or lander)-based surface missions toward base construction for long-term human habitation. However, a 3D terrain map, mostly based orbiters’ images, insufficient resolutions purposes. In this regard, paper introduces visual simultaneous localization mapping (SLAM)-based robotic method employing stereo camera system...

There is increasing interest in the potential application of microwave sintering technology construction infrastructure on Moon. This study aimed to characterize dielectric properties situ lunar materials; this information critical for an understanding interaction these materials with and technology. Dielectric including real imaginary permittivity, loss tangent, penetration depth, electrical conductivity Korean Lunar Simulant (KLS-1) ilmenite (an abundant mineral) were investigated at...

Charging of the lunar surface induced by solar radiation can potentially threaten in situ resource utilization. Associated issues include dust adhesion and material degradation. Photoelectric currents are primary cause charging. This work reports on development a unit capable measuring photoelectric vacuum chamber, which simulate charging under conditions similar to those moon daytime. The main components mesh grid, photocathode specimen, ring collector. from an aluminum sample were measured...

Abstract We propose a new method, i.e., the statistical phase fraction (SPF) to estimate total porosity and spatial distribution of local porosities from subresolution pore-dominated X-ray microtomography images porous materials. The SPF method assumes that voxel in CT image is composed either single or maximum three pure phases matter (solid, liquid air). Gaussian function (GF) fitting conducted on basis summation area each GF curve equal covered by histogram. volume corresponding...

화강암은 미세균열 및 광물입자의 배열형태에 따라 직교하는 세 방향(rift, grain, hardway)의 이방성을 내포한다. 본 연구에서는 포천화강암의 분포특성에 따른 이방성이 탄성파에 미치는 영향을 확인하기 위해서 자유단공진시험을 수행하였으며, 비구속압축파, 전단파, 포아송비, 재료 감쇠비등의 공진특성 등을 파악하였다. 결과적으로, 분포 특성에 비구속압축파와 전단파가 서로 다른 경향을 보여주고 있음을 확인하였다. 또한, 포아송비와 재료감쇄비도 개의 결방향에 이방성 특성이 나타남을 Granite rock is reported to have three orthogonal anistoropic planes i.e., rift, grain induced by microcrack characteristics and mineral arrangement. We investigated the influence of thus fabric anisotropy in granite on...

Microwave sintering is regarded as one of the most appropriate technologies that enable in situ resource utilization (ISRU) surface construction for future lunar base development. During process microwave sintering, electromagnetic radiant energy absorbed by soil grains whereby temperature increment and bonding take place. However, due to anisotropic field thermal runaway phenomenon, a gradient could occur sintered regolith grains. This can induce local flaws (such cracks) enclosed pores...

Artificial neural networks are increasingly being used by mathematicians and scientists for complex calculations but apparently not civil engineers. Such have many advantages over rigid equations design codes, least that they can be continually ‘retrained’ when new field or research data become available. On the downside, like people, very transparent always reliable. This paper shows how a relatively simple network outperform Burland Burbidge's well-established 1985 ground settlement...

본 연구에서는 주방식 지하구조물의 안정성 검토방안을 마련하기 위해 암주와 천장부의 거동을 수치해석 방법으로 검토하였다. 또한, 기존 자원개발 분야에서 고려하는 공법의 설계 개념과는 달라져야 하는, 공간 확보차원에서의 합리적인 절차 및 개념을 제시하였다. 주어진 지반 조건에서 암주의 형상비와 길이에 따른 수치해석을 수행하였으며 초기 이완이 시작되는 시점에서의 파괴유형과 위치 변화를 해석결과, 천장부 폭과 암주 폭과의 비(w/s)와 파괴시점의 상재하중간의 관계는 선형관계를 보였으며, 폭의 비가 채광 설계에서는 매우 중요한 설계인자로 다루어지는 높이 비(w/H)보다 구조물의 확보차원에서는 더욱 민감한 설계인자인 것으로 나타났다. 이는, 만을 확보하는 차원에서 수행되는 설계법과는 달리, 암주부와 함께 구조물 어깨부의 안정성까지도 고려하여 안정성을 확보할 수 있는 설계가 되어야 함을 의미한다. 형상에 따라 이완대가 발생하는 위치와 전단 또는 인장파괴 등 파괴유형도 다르게 나타나,...