The Experts below are selected from a list of 3786 Experts worldwide ranked by ideXlab platform
Yu Qiao - One of the best experts on this subject based on the ideXlab platform.
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ultralow binder content thermoplastic composites based on Lunar Soil simulant
Advances in Space Research, 2020Co-Authors: Tzehan Chen, Rui Kou, Yu QiaoAbstract:Abstract In a recent study, we developed ultralow-binder-content (UBC) structural materials based on Lunar Soil simulant and thermoset binders. In the current research, we investigated thermoplastic binders. Compared to thermosets, advanced thermoplastics could be more UV resistant, more durable, more robust, and recyclable. Our main technology is the compaction self-assembly (CSA). By using only ~4 wt% polyetherketoneketone (PEKK) binder, the thermoplastic-binder UBC composite was stronger than typical steel-reinforced concrete in flexural tests. The CSA operation was separate from the curing procedure. This study may provide an important in-situ resource utilization method for the large-scale construction on the Moon.
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Compaction Self-Assembly of Ultralow-Binder-Content Thermoplastic Composites Based on Lunar Soil Simulant
'Elsevier BV', 2020Co-Authors: Oh Kiwon, Chen Tzehan, Kou Rui, Yi Haozhe, Yu QiaoAbstract:In a recent study, we developed ultralow-binder-content (UBC) structural materials based on Lunar Soil simulant and thermoset binders. In the current research, we investigated thermoplastic binders. Compared to thermosets, advanced thermoplastics could be more UV resistant, more durable, more robust, and recyclable. Our main technology is the compaction self-assembly (CSA). By using only ~4 wt% polyetherketoneketone (PEKK) binder, the thermoplastic-binder UBC composite was stronger than typical steel-reinforced concrete. The CSA operation was separate from the curing process. This study may provide an important in-situ resource utilization method for large-scale construction on Moon.Comment: 14 pages, 5 figure
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Fatigue Behavior of Inorganic-Organic Hybrid "Lunar Cement".
Scientific reports, 2019Co-Authors: Youshi Hong, Tzehan Chen, Ying Zhong, Meng Wang, Rui Kou, Yu QiaoAbstract:We report the experimental results of fatigue behavior of ultralow-binder-content inorganic-organic hybrid (IOH) based on Lunar Soil simulant, which may be viewed as a "Lunar cement". Under the same loading condition, the fatigue life of the IOH is superior to typical steel-reinforced concrete, especially when the stress amplitude is relatively high. Fatigue damage mostly occurs in the binder phase, followed by rapid cleavage-like failure. The important material parameters include filler type, filler particle size, and filler-binder bonding.
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formation of polymer micro agglomerations in ultralow binder content composite based on Lunar Soil simulant
Advances in Space Research, 2017Co-Authors: Tzehan Chen, Brian J Chow, Ying Zhong, Meng Wang, Yu QiaoAbstract:Abstract We report results from an experiment on high-pressure compaction of Lunar Soil simulant (LSS) mixed with 2–5 wt% polymer binder. The LSS grains can be strongly held together, forming an inorganic-organic monolith (IOM) with the flexural strength around 30–40 MPa. The compaction pressure, the number of loadings, the binder content, and the compaction duration are important factors. The LSS-based IOM remains strong from −200 °C to 130 °C, and is quite gas permeable.
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inorganic organic hybrid of Lunar Soil simulant and polyethylene
Journal of Materials in Civil Engineering, 2016Co-Authors: Tzehan Chen, Brian J Chow, Meng Wang, Yang Shi, Cang Zhao, Yu QiaoAbstract:AbstractInorganic–organic hybrid (IOH) Lunar cements are processed by using a Lunar Soil simulant and polyethylene (PE). As the inorganic simulant grains are strongly held together by the PE binder, the IOH may be utilized as an infrastructural material on the Lunar surface. With a uniform simulant grain size, the flexural strength of the IOH decreases exponentially with the binder content, quite close to the strength of samples of random simulant grain-size distribution. If the simulant grains have a two-step size gradation, the IOH strength increases significantly. Above a threshold binder content, the strength decreases only slightly as more simulant grains are added; below the threshold, the IOH becomes much weaker as less binder is used.
Tzehan Chen - One of the best experts on this subject based on the ideXlab platform.
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ultralow binder content thermoplastic composites based on Lunar Soil simulant
Advances in Space Research, 2020Co-Authors: Tzehan Chen, Rui Kou, Yu QiaoAbstract:Abstract In a recent study, we developed ultralow-binder-content (UBC) structural materials based on Lunar Soil simulant and thermoset binders. In the current research, we investigated thermoplastic binders. Compared to thermosets, advanced thermoplastics could be more UV resistant, more durable, more robust, and recyclable. Our main technology is the compaction self-assembly (CSA). By using only ~4 wt% polyetherketoneketone (PEKK) binder, the thermoplastic-binder UBC composite was stronger than typical steel-reinforced concrete in flexural tests. The CSA operation was separate from the curing procedure. This study may provide an important in-situ resource utilization method for the large-scale construction on the Moon.
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Fatigue Behavior of Inorganic-Organic Hybrid "Lunar Cement".
Scientific reports, 2019Co-Authors: Youshi Hong, Tzehan Chen, Ying Zhong, Meng Wang, Rui Kou, Yu QiaoAbstract:We report the experimental results of fatigue behavior of ultralow-binder-content inorganic-organic hybrid (IOH) based on Lunar Soil simulant, which may be viewed as a "Lunar cement". Under the same loading condition, the fatigue life of the IOH is superior to typical steel-reinforced concrete, especially when the stress amplitude is relatively high. Fatigue damage mostly occurs in the binder phase, followed by rapid cleavage-like failure. The important material parameters include filler type, filler particle size, and filler-binder bonding.
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formation of polymer micro agglomerations in ultralow binder content composite based on Lunar Soil simulant
Advances in Space Research, 2017Co-Authors: Tzehan Chen, Brian J Chow, Ying Zhong, Meng Wang, Yu QiaoAbstract:Abstract We report results from an experiment on high-pressure compaction of Lunar Soil simulant (LSS) mixed with 2–5 wt% polymer binder. The LSS grains can be strongly held together, forming an inorganic-organic monolith (IOM) with the flexural strength around 30–40 MPa. The compaction pressure, the number of loadings, the binder content, and the compaction duration are important factors. The LSS-based IOM remains strong from −200 °C to 130 °C, and is quite gas permeable.
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inorganic organic hybrid of Lunar Soil simulant and polyethylene
Journal of Materials in Civil Engineering, 2016Co-Authors: Tzehan Chen, Brian J Chow, Meng Wang, Yang Shi, Cang Zhao, Yu QiaoAbstract:AbstractInorganic–organic hybrid (IOH) Lunar cements are processed by using a Lunar Soil simulant and polyethylene (PE). As the inorganic simulant grains are strongly held together by the PE binder, the IOH may be utilized as an infrastructural material on the Lunar surface. With a uniform simulant grain size, the flexural strength of the IOH decreases exponentially with the binder content, quite close to the strength of samples of random simulant grain-size distribution. If the simulant grains have a two-step size gradation, the IOH strength increases significantly. Above a threshold binder content, the strength decreases only slightly as more simulant grains are added; below the threshold, the IOH becomes much weaker as less binder is used.
Zongquan Deng - One of the best experts on this subject based on the ideXlab platform.
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the research and design of pneumatic multi pipe deep Lunar Soil drilling device
International Conference on Mechatronics and Automation, 2016Co-Authors: Ping Liang, Xuyan Hou, Kailiang Zhang, Kaidi Zhang, Zongquan DengAbstract:This research proposed a pneumatic multi-pipe deep Lunar Soil drilling device under the background of manned Lunar-landing and used coupled simulation by EDEM/Fluent for the drilled process, pneumatic drilling principle has been proved feasible by the simulation result. The drilled device this research proposed can collect Lunar Soil five meters under the surface, and ensure that the bedding information of the collected Lunar Soil is complete.
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coring bit with enhanced structural parameters for improved Lunar Soil sampling and reduced mechanical disturbance
Journal of Aerospace Engineering, 2016Co-Authors: Ye Tian, Zongquan DengAbstract:AbstractA new coring bit with a barrier ring was developed to address the disturbance problem associated with the common method of Lunar Soil sampling. This new coring bit is presented in this paper along with an analysis of the physical characteristics of regolith and coring bits. The structural parameters of the barrier ring, which disturbs the original state of the Soil, are also analyzed. A user-defined material, based on the user-defined material mechanical behavior (UMAT) subroutine in the ABAQUS finite-element software, was used to simulate the contact area between the Lunar Soil and the barrier. The simulation results showed that the structure of the barrier ring has a significant effect on the stress and displacement produced in the Lunar Soil below the coring bit, but has little effect on the Soil inside the ring. The test results showed that the coring bit with the barrier ring achieves a higher coring rate and causes less disturbance than a common bit.
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the study of the drilling core features of a multi pipe deep Lunar Soil sampling driller for manned Lunar exploration based on the discrete element technology
Robotics and Biomimetics, 2015Co-Authors: Kailiang Zhang, Tianxiang Ding, Zongquan DengAbstract:Lunar Soil sampling is important for human beings to know about the components of Lunar Soil and the Lunar geological structure. By now, Lunar Soil between the depths 0 and 3 meters is researched, but there are not any drillers which can collect the much deeper Lunar Soil. In this paper, a multi-pipe driller that can drill 5 meters deep for manned Lunar exploration was proposed. In order to verify the reliability of drilling core, the drilling core features of the driller were studied by using the EDEM software. The influences of drill pipes rotation speed and feed rate to the drilling core were studied. The results turned out that the feed rate had a significant influence on the drilling core features and the rotation speed had an important influence on the power and the torque. The simulation results can provide guidance for the optimization of the system structure and the technical supports to China's deep Lunar Soil sampling project.
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experimental research on drilling and sampling of Lunar Soil simulant
Applied Mechanics and Materials, 2012Co-Authors: Xiao Lei Shi, Xuyan Hou, Qiquan Quan, Shengyuan Jiang, De Wei Tang, Zongquan DengAbstract:China is conducting a Lunar exploration mission named “Chang’e project”. The goal of the exploration mission is to obtain the drilling core without breaking the original geological information. Since the characteristics of drilling object in Lunar exploration mission are different from the Soil on the earth, efforts should be greatly made on special sampling methods, sampling drills and the appropriate sampling strategies. Herein, we proposed a novel drilling and coring method, in which a soft-bag is mounted in a rotary-percussive drill for Lunar Soil sampling. In the process of Lunar Soil drilling, the driving parameters of several moving units are strongly coupled. The moving units should work cooperatively in order to acquire high coring rate and low power consumption. The relationship between the coring quantity and the drilling parameters will be discussed through experiments. The research showed a clear correlation between rotary drilling torque, sample quantity and rev-feed ratio under specific Lunar Soil conditions.
L P Keller - One of the best experts on this subject based on the ideXlab platform.
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Plagioclase-Rich Itokawa Grains: Space Weathering, Exposure Ages, and Comparison to Lunar Soil Grains
2017Co-Authors: L P Keller, E. BergeAbstract:Regolith grains returned by the Hayabusa mission to asteroid 25143 Itokawa provide the only samples currently available to study the interaction of chondritic asteroidal material with the space weathering environment. Several studies have documented the surface alterations observed on the regolith grains, but most of these studies involved olivine because of its abundance. Here we focus on the rarer Itokawa plagioclase grains, in order to allow comparisons between Itokawa and Lunar Soil plagioclase grains for which an extensive data set exists.
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the nature and origin of rims on Lunar Soil grains
Geochimica et Cosmochimica Acta, 1997Co-Authors: L P Keller, David S MckayAbstract:Abstract Space weathering processes that operate in the Lunar regolith modify the surfaces of Lunar Soil grains. Transmission electron microscope analysis of the Lunar Soil grains from the fine size fraction of several Lunar Soils show that most grains are surrounded by thin (60–200 nm thick) rims. The microstructure and chemical compositions of the rims can be used to classify rims into four broad categories: amorphous, inclusion-rich, multiple, and vesicular. Amorphous rims are noncrystalline, generally lack crystalline inclusions, show evidence for preferential sputtering of cations, and are produced largely by solar-wind irradiation damage. Inclusion-rich rims contain abundant nanometer-sized grains of Fe metal as randomly dispersed inclusions or as distinct layers embedded in an amorphous silica-rich matrix. Inclusion-rich rims are compositionally distinct from their host grains and typically contain accumulations of elements that are not indigenous to the host. Inclusion-rich rims are formed largely by the deposition of impact-generated vapors with a contribution from the deposition of sputtered ions. A continuum in the chemical and microstructural properties exists between typical amorphous rims and typical inclusion-rich rims. Multiple-rims consist of a distinct radiation-damaged layer up to 50 nm thick, that is overlain by vapor-deposited material of comparable thickness. Vesicular rims are compositionally similar to their hosts and are characterized by an abundance of small ( The formation of rims on Lunar Soils is complex and involves several processes whose effects may be superimposed. From this study, it is shown that one process does not dominate and that the relative importance of vapor-deposition is comparable to radiation-damage in the formation of rims on Lunar silicate grains. The presence of rims on Lunar Soil grains, particularly those with nanometer-sized Fe metal inclusions, may have a major influence on the optical and magnetic properties of Lunar Soils.
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microstructure chemistry and origin of grain rims on ilmenite from the Lunar Soil finest fraction
Meteoritics & Planetary Science, 1996Co-Authors: R Christoffersen, David S Mckay, L P KellerAbstract:Analytical transmission electron microscope (TEM) observations reveal that ilmenite grains sampled from the sub-10 micron size fraction of Apollo 11 (10084) and Apollo 16 (61221, 67701) Soils have rims 10-300 nm thick that are chemically and microstructurally distinct from the host ilmenite. The rims have a thin outer sublayer 10-50 nm thick that contains the ilmenite-incompatible elements Si, Al, Ca and S. This overlies a relatively thicker (50-250 nm) inner sublayer of nanocrystalline Ti-oxide precipitates in a matrix of single-crystal ilmenite that is structurally continuous with the underlying host grain. Microstructural information, as well as data from x-ray spectrometry (EDS) and electron energy loss spectrometry (EELS) analysis of the inner sublayer, suggest that both the inner and outer sublayer assemblages are reduced and that the inner layer is depleted in Fe relative to the underlying ilmenite. The chemistry of the outer sublayer suggests that it is a surface deposit of sputtered or impact-vaporized components from the bulk Lunar Soil. The inner sublayer is part of the original host grain that has been physically and chemically processed, but not amorphized, by solar ion irradiation and possibly some subsolidus heating. The fact that the deposited outer sublayer is consistently much thinner than the radiation-altered inner sublayer indicates that only a minor fraction of the total rim volume is a product of vapor or sputter deposition. This finding is in contrast to recent descriptions of thick deposited layers on one-third of regolith silicate grains and indicates that ilmenite and silicate rims as a group are different in the fraction of deposited material that they contain.
Meng Wang - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Behavior of Inorganic-Organic Hybrid "Lunar Cement".
Scientific reports, 2019Co-Authors: Youshi Hong, Tzehan Chen, Ying Zhong, Meng Wang, Rui Kou, Yu QiaoAbstract:We report the experimental results of fatigue behavior of ultralow-binder-content inorganic-organic hybrid (IOH) based on Lunar Soil simulant, which may be viewed as a "Lunar cement". Under the same loading condition, the fatigue life of the IOH is superior to typical steel-reinforced concrete, especially when the stress amplitude is relatively high. Fatigue damage mostly occurs in the binder phase, followed by rapid cleavage-like failure. The important material parameters include filler type, filler particle size, and filler-binder bonding.
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formation of polymer micro agglomerations in ultralow binder content composite based on Lunar Soil simulant
Advances in Space Research, 2017Co-Authors: Tzehan Chen, Brian J Chow, Ying Zhong, Meng Wang, Yu QiaoAbstract:Abstract We report results from an experiment on high-pressure compaction of Lunar Soil simulant (LSS) mixed with 2–5 wt% polymer binder. The LSS grains can be strongly held together, forming an inorganic-organic monolith (IOM) with the flexural strength around 30–40 MPa. The compaction pressure, the number of loadings, the binder content, and the compaction duration are important factors. The LSS-based IOM remains strong from −200 °C to 130 °C, and is quite gas permeable.
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inorganic organic hybrid of Lunar Soil simulant and polyethylene
Journal of Materials in Civil Engineering, 2016Co-Authors: Tzehan Chen, Brian J Chow, Meng Wang, Yang Shi, Cang Zhao, Yu QiaoAbstract:AbstractInorganic–organic hybrid (IOH) Lunar cements are processed by using a Lunar Soil simulant and polyethylene (PE). As the inorganic simulant grains are strongly held together by the PE binder, the IOH may be utilized as an infrastructural material on the Lunar surface. With a uniform simulant grain size, the flexural strength of the IOH decreases exponentially with the binder content, quite close to the strength of samples of random simulant grain-size distribution. If the simulant grains have a two-step size gradation, the IOH strength increases significantly. Above a threshold binder content, the strength decreases only slightly as more simulant grains are added; below the threshold, the IOH becomes much weaker as less binder is used.
