Naruki Ichihara- Doctor of Philosophy
- Professor (Assistant) at Nihon University
Naruki Ichihara
- Doctor of Philosophy
- Professor (Assistant) at Nihon University
Concurrently served as a project assis. prof. in department of aeronautics and astronautics, The University of Tokyo.
About
17
Publications
3,290
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
122
Citations
Introduction
Material design for high-performance 3D printed composites structures.
Current institution
Additional affiliations
April 2022 - March 2025
May 2024 - present
April 2019 - March 2020
Position
- Material Engineering Planning
Description
- Development and planning of lightweight composite material for vehicle engineering.
Publications
Publications (17)
The three-dimensional (3D) printing of recycled carbon fiber was demonstrated by the fused filament fabrication technique. A recycled carbon fiber spun yarn was processed into a filament for 3D printing using polyamide 6 and polyamide 12 as the matrix. The fibers were aligned in the axial direction of the filament, and the filament followed the pri...
Microdefects such as fiber waviness and voids are critical problems in the three-dimensional (3D) printing of continuous carbon fiber-reinforced thermoplastics (CFRTPs), degrading their mechanical properties. This work demonstrates that a regularized microstructure can be achieved by controlling printing forces, resulting in high axial compressive...
The topology and fiber orientation of fiber-reinforced composite structures must be designed computationally to fully demonstrate their anisotropic mechanical properties. Optimization of the topology and fiber orientation is performed either sequentially or concurrently. In the sequential method, topology optimization is performed first, followed b...
The 3D printing of continuous carbon fiber-reinforced thermoplastics (c-CFRTP) results in fiber waviness and voids that limit mechanical performance. The effects of tensioning and compaction forces during 3D printing were experimentally studied to suppress fiber waviness. A tensioning force was generated along the filament to straighten the fibers...
The high-stiffness 3D-printed continuous carbon fiber reinforced polymer composite structure was proposed based on concurrent topology and material orientation optimization. The multi-variable topology optimization was performed with the Cartesian representation of orientation. The 3D print path was developed from the optimized result by means of t...
The post-failure behavior of a fiber-reinforced polymer composite lattice was experimentally studied using a beam structure. Anisotropic topology optimization was conducted to maximize the structural stiffness and partial latticing to improve toughness. Subsequently, an infill structure was generated from the optimized results using a phase field a...
The toughness of structures is essential to prevent catastrophic failure. This study introduced a design framework to improve the toughness of 3D-printed carbon fiber-reinforced composite structures by local latticing utilizing the intermediate material fraction obtained in the topology optimization. The framework was based on aniso-tropic topology...
The elastic, plastic, and in-plane damage evolutions of a carbon-fiber-reinforced epoxy composite fabricated via filament winding were studied based on continuum damage mechanics. The specific voids and resin-rich region distributions depended on the material and manufacturing conditions. The damage evolutions were expressed by a unified curve, ind...
The effect of the resin content of towpreg and traverse rate in the filament winding
process on the damage evolution of carbon fiber reinforced plastic was experimentally studied. Totally five types of coupon specimens were prepared by filament winding process. Plate-type mandrels for filament winding were prepared to make the coupon specimens. Th...
Perforated plates were 3D printed by carbon fiber reinforced plastic using several print path strategies to study the effect of print paths on the bearing strength in pin-loading. Angle, quasi-isotropic, and concentric print paths showed different bearing strengths. The concentric print path showed higher bearing strength causing material failure a...
Stiffness maximization of a 3D-printed fiber-reinforced polymer structure was proposed based on the topology and material orientation optimization. The numerical material test investigated the relationship between material fraction and effective stiffness. Then, anisotropic topology optimization based on the effective stiffness was performed to max...
This paper proposed 3D printing of orthotropic material, carbon fiber-reinforced polymers, based on the optimized material orientation and distribution. First, the cross-ply orthotropic material orientation and distribution were optimized using the gradient-based anisotropic topology optimization method to maximize the structural stiffness. Then, t...
A framework to produce an optimized infill structure for 3D-printed curvilinear fiber-reinforced polymer composites is proposed. The material orientation was optimized first to maximize the physical properties. Then, the phase field of the stripe pattern was developed based on the optimized material orientation vector field using the local activati...
Continuum damage mechanics (CDM) based on finite element analysis was performed to predict the mechanical behavior of a 3D-printed curvilinear continuous carbon fiber reinforced thermoplastic (c-CFRTP). Elastoplastic properties of the 3D-printed c-CFRTP including damage initiation, evolution, and propagation were identified using monotonic and cycl...
