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1. Confinement Controlled Swelling Mechanisms of Hydrogels in Multi-Material Architectures<\/strong> Examines how rigid\/semi-rigid surrounding material in a multi-material printed structure geometrically confines and redirects hydrogel swelling behavior. Unconstrained hydrogels swell isotropically, but embedding them within a stiffer printed architecture redirects swelling-induced stress and deformation \u2014 relevant to the group’s vascular stent, sensor, and 4D-printing work, where controlling (or exploiting) this confined swelling is key to programmed shape-change or structural stability. Description is partly inferred from the title and the group’s related published work; I was unable to access the full text, so treat specific mechanistic claims as inferred rather than confirmed.<\/em><\/p>\n\n\n\n 2. Spatial Mechanical Enhancement Strategy Enabled by Multi-Axis Material Extrusion Additive Manufacturing<\/strong> Layer-by-layer material extrusion printing is fundamentally limited by weak interlayer bonding, creating directional weaknesses. This study proposes a multi-degree-of-freedom (MDOF) spatial enhancement strategy using a six-axis printer: parts are divided at the design stage into “core” and “reinforcement” layers, with reinforcement deposited at controlled angles relative to the core to achieve true spatial (non-planar) anisotropy. Mechanical testing showed core-layer ratio, reinforcement-to-core raster angle, and reinforcement fill rate all strongly affect tensile, compressive, and bending performance, with a 5:5 core ratio, 90\u00b0 angle, and 90% fill rate giving optimal results; SEM fractography clarified the strengthening\/fracture mechanisms. This overcomes the classic weak-interlayer-bonding limitation of standard 3-axis extrusion, extending printability to freeform surfaces and complex load-bearing geometries, with noted applicability in aerospace, automotive, and biomedical structures \u2014 and to other multi-axis printing platforms beyond the group’s own six-axis system.<\/p>\n\n\n\n 3. 3D\u30d7\u30ea\u30f3\u30bf\u3067\u88fd\u9020\u3057\u305f\u6728\u7c89\u30fbPLA\u6a39\u8102\u8907\u5408\u6750\u306e\u529b\u5b66\u7684\u6027\u8cea (Mechanical Properties of Wood Powder\/PLA Resin Composite Materials Manufactured by 3D Printer)<\/strong> Reports mechanical property testing (likely tensile strength, thermal-history effects) of a wood-powder\/PLA composite filament fabricated via 3D printing. Shares several co-authors (Wakita, Takaguchi, Miyazu, Umezu) with the ISRU wooden-joinery project below, suggesting this composite serves as an accessible terrestrial analog material for testing joint geometries and print parameters ahead of work with actual regolith-based or space-qualified composites. As a conference proceeding, detailed quantitative results are not independently verifiable from public abstracts alone.<\/p>\n\n\n\n 4. 3D Printed Joining System Inspired by Traditional Japanese Wooden Joinery for ISRU<\/strong> Addresses a core constraint of extraterrestrial construction: resupplying materials from Earth is slow and costly, so long-duration lunar\/planetary habitation requires building with locally available or repurposed materials (In-Situ Resource Utilization, ISRU). Proposes a joining system inspired by Kigumi<\/em>, traditional Japanese wooden joinery, which achieves strong, disassemblable connections without nails or adhesives. By attaching 3D-printed joints (informed by 3D scanning) to irregularly shaped raw materials, the system converts non-uniform elements into standardized, assemblable and disassemblable members \u2014 combining Kigumi’s structural and disassembly performance with digital fabrication for off-Earth construction.<\/p>\n\n\n\n 5. 3D\u30d7\u30ea\u30f3\u30bf\u9020\u5f62\u7269\u306e\u5316\u5b66\u6eb6\u89e3\u4ed5\u4e0a\u3052\u624b\u6cd5\u306b\u3088\u308b\u8868\u9762\u7c97\u3055\u306e\u5909\u5316 (Changes in Surface Roughness via Chemical Dissolution Finishing of 3D-Printed Parts)<\/strong> Investigates a chemical-dissolution surface-finishing technique for FDM-printed parts, aimed at smoothing the layer-lines (\u7a4d\u5c64\u75d5) inherent to fused-deposition 3D printing without mechanical abrasion. A solvent partially dissolves and reflows the outermost printed layer, and the study characterizes how resulting surface roughness changes with process parameters. Connects to the same group’s broader line of work on FDM post-processing (including related conference papers on 3D chemical-dissolution finishing and its image-based evaluation), addressing a persistent practical limitation of low-cost FDM printing \u2014 visible layer artifacts \u2014 largely independent of any specific application domain.<\/p>\n\n\n\n 6. FDM 3D Printing of ABS\/Artificial Lunar Soil Composite Filament (About FDM 3D Printing Process of Artificial Lunar Soil)<\/strong> The Moon is rich in regolith resources, and combining in-situ lunar soil utilization with intelligent manufacturing could substantially reduce dependence on Earth-launched payload for future space exploration. This study blends artificial lunar soil (ALS) simulant with ABS polymer powder and produces a printable filament via melt extrusion, enabling FDM 3D printing directly from the composite. Represents an early, foundational step in the group’s ISRU-oriented additive manufacturing research \u2014 evaluating whether lunar-soil-loaded thermoplastic filament can be reliably extruded and printed, a prerequisite for later structural applications like the Kigumi-inspired joinery system above.<\/p>\n\n\n\n 3D printers designed for lunar applications are specifically engineered to function in the extreme conditions of space and on the lunar surface. These printers undergo rigorous modifications to withstand factors like low gravity, extreme temperature fluctuations, and the presence of lunar dust (regolith). They often utilize techniques such as selective laser sintering (SLS) or fused […]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-210","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/pages\/210","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/comments?post=210"}],"version-history":[{"count":6,"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/pages\/210\/revisions"}],"predecessor-version":[{"id":1468,"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/pages\/210\/revisions\/1468"}],"wp:attachment":[{"href":"https:\/\/umeshin.mmech.waseda.ac.jp\/index.php\/wp-json\/wp\/v2\/media?parent=210"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Published: 2026 | Materials & Design<\/em>
Authors: Ze Zhang, Mohamed Adel, Jianxian He, Yannan Li, Chaolun Xu, Yifan Pan, Rongyi Zhuang, et al.<\/em> (full list unconfirmed \u2014 Google Scholar’s listing was truncated; Shinjiro Umezu presumed senior author but not directly verified)<\/p>\n\n\n\n
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Published: January 31, 2025 | Journal of Manufacturing Processes<\/em>, Vol. 134, pp. 762\u2013774
Authors: Ze Zhang, Kewei Song, Yifan Pan, Jianxian He, Shinjiro Umezu<\/p>\n\n\n\n
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Presented: October 17\u201318, 2024 | \u65e5\u672c\u5efa\u7bc9\u4ed5\u4e0a\u5b66\u4f1a 2024\u5e74\u5927\u4f1a\u5b66\u8853\u8b1b\u6f14\u4f1a (Japan Society of Finishing Technology, 2024 Annual Conference), Gifu Nagara River International Conference Center
Authors: Tatsuya Ida, Yukiko Homma, Shinjiro Umezu, Hiroto Takaguchi, Yuji Miyazu, Takehiro Wakita, et al.<\/em><\/p>\n\n\n\n
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Presented: July 29 \u2013 August 1, 2024 | 10th International Conference on Construction Engineering and Project Management (ICCEPM 2024), Sapporo, Japan
Authors: Yusuke Hozumi, Takehiro Wakita, Ayato Doki, Hiroto Takaguchi, Tatsuya Inden, Shinjiro Umezu, Yuji Miyazu<\/p>\n\n\n\n
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Published: 2023 | \u7825\u7c92\u52a0\u5de5\u5b66\u4f1a\u8a8c (Journal of the Japan Society for Abrasive Technology)
Authors: Shinjiro Umezu, Kensuke Takagishi<\/p>\n\n\n\n
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Presented: September 5\u20138, 2021 | \u65e5\u672c\u6a5f\u68b0\u5b66\u4f1a 2021\u5e74\u5ea6\u5e74\u6b21\u5927\u4f1a (JSME 2021 Annual Conference), online, Presentation No. S143-04 | DOI: 10.1299\/jsmemecj.2021.S143-04
Authors: Kewei Song, Xiangyi Meng, Jun Koyanagi, Shinjiro Umezu<\/p>\n\n\n\n