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Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6548
Author(s):  
Xian Li ◽  
Nan Zhong ◽  
Huan Hu ◽  
Yufan Zhang ◽  
Yawen Huang ◽  
...  

Benzocyclobutene-modified silsesquioxane (BCB-POSS) and divinyl tetramethyl disiloxane-bisbenzocyclobutene (DVS-BCB) prepolymer were introduced into the containing benzocyclobutene (BCB) unit matrix resin P(4-MB-co-1-MP) polymerized from 1-methyl-1-(4-benzocyclobutenyl) silacyclobutane (4-MSCBBCB) and 1-methyl-1-phenylsilacyclobutane (1-MPSCB), respectively. The low dielectric constant (low-k) siloxane/carbosilane hybrid benzocyclobutene resin composites, P(4-MB-co-1-MP)/BCB-POSS and P(4-MB-co-1-MP)/DVS-BCB, were prepared. The curing processes of the composites were assessed via Fourier-transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC). The effects on dielectric properties and heat resistance of those composites with different proportion of BCB-POSS and DVS-BCB were investigated using an impedance analyzer and thermogravimetric analyzer (TGA), respectively. The thermal curing of composites could be carried out by ring-opening polymerization (ROP) of the BCB four-member rings of BCB-POSS or DVS-BCB and those of P(4-MB-co-1-MP). With increasing the proportion of BCB-POSS to 30%, the 5% weight loss temperature (T5%) of P(4-MB-co-1-MP)/BCB-POSS composites was raised visibly, whereas the dielectric constant (k) was decreased owing to the introduction of nanopores into POSS. For P(4-MB-co-1-MP)/DVS-BCB composites, the T5% and k were slightly raised with increasing the proportion of DVS-BCB. The above results indicated that the BCB-POSS showed advantages over conventional fillers to simultaneously improve thermostability and decrease k.


2021 ◽  
Author(s):  
AKINORI YOSHIMURA ◽  
KENJI IWATA ◽  
KEITA GOTO ◽  
MASAHIRO ARAI

This paper proposes a finite element modeling method for textile composite, in which fiber bundle and matrix resin are separately meshed, and they are connected by using discontinuous Galerkin (DG) method. The fiber bundle geometry is often complex in the textile composite. In the conventional FEM, it causes small, distorted resin elements surrounded by the fiber bundles, because the resin must be meshed along the fiber bundle geometry. These distorted elements result in the increased effort to meshing, computing cost, and degraded accuracy. In the proposed method, we apply the DG method to the 3-dimensional analysis of the textile composite. DG method is a method which can connect two separately divided meshes in the FEM. The method proposed in this paper has a distinct advantage, because matrix resin has not to be meshed along the fiber bundle geometry. Moreover, regular cubic grid mesh can be used for matrix resin. In the present paper, the formulation of the DG method is presented first. The method and results of the microscopic stress analysis for textile composite is then described. The results agree well with those of conventional FEM, and validity of the proposed method is demonstrated.


Author(s):  
Yuta Naito ◽  
Masaaki Nishikawa ◽  
Christophe Mobuchon ◽  
Anoush Poursartip ◽  
Naoki Matsuda ◽  
...  

2021 ◽  
Vol 77 (5) ◽  
pp. P-227-P-230
Author(s):  
IDZUMI OKAJIMA

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ying Xu ◽  
Xiaohong Zhan ◽  
Hongyan Yang ◽  
Hengchang Bu ◽  
Feiyun Wang

Abstract Laser joining merges as a novel technique for the connection of carbon fiber reinforced thermoplastics composite (CFRTP) and metal. Besides, machining grooves on the metal surface presents a surface pre-treating method to enhance the strength of laser joining joint between CFRTP and metal. In this study, the laser joining of CFRTP and Ti6Al4V alloy is performed with different groove dimensions. The effect of groove dimension on interface morphology and failure load is analyzed. In addition, the formation mechanism of the interface and the fracture mode of the joint are further elucidated. The results indicate that the structurally sound connection and maximum failure load are attained with an appropriate groove dimension (groove width: 0.7 mm, groove depth: 0.25 mm, and aspect ratio: 0.36). At a narrower groove, the bubbles inside the resin caused by thermal decomposition of the matrix resin are obtained, while at a deeper groove, the gaps and holes are observed in the interface of the joint, both resulting in a lower failure load.


2021 ◽  
Author(s):  
Alexander Vedernikov ◽  
Alexander Safonov ◽  
Fausto Tucci ◽  
Pierpaolo Carlone ◽  
Iskander Akhatov

Peculiarities of the pultrusion manufacturing process lead to the occurrence of spring-in deformations, whereas their value depends on the pulling speed. In this article experimental and numerical analysis was carried out for glass fiber/vinyl ester resin 75 × 75 × 6 mm L-shaped profiles pultruded at pulling speeds of 200 and 600 mm/min. Spring-in angles of produced profiles were determined on the same day of manufacturing when profiles cooled down to room temperature. Higher pulling speeds provoked increased values of spring-in. 2D numerical model accounting for thermo-chemical and mechanical composite’s behavior during pultrusion was implemented in ABAQUS software. Cure Hardening Instantaneous Linear Elastic (CHILE) constitutive law was used to describe matrix resin Young’s modulus evolution. Since both unidirectional (UD) rovings and fabric material were utilized, effective mechanical properties of UD and fabric layers were calculated in accordance with Self-Consistent Field Micromechanics (SCFM) approach. Spring-in angles determined within experimental and numerical studies were compared and a good correlation was found: the errors were 12.6% and 6% for the pulling speed of 200 and 600 mm/min, respectively.


2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Jieyuan Zheng ◽  
Tariq Aziz ◽  
Hong Fan ◽  
Fazal Haq ◽  
Farman Ullah Khan ◽  
...  

AbstractThe cellulose nanocrystals (CNCs) surface modified with phenolic and acrylic resins were investigated for different properties such as thermally stability and adhesive property, the mechanical properties of CNCs and interactions of the resulting materials at a micro-level are very important. Phenolic resins are of great interest due to their smooth structure, low thermal conductivity and good thermal insulation. However, the high spray rates and poor mechanical properties limit its use for external insulation of buildings. Acrylic resins are used as a matrix resin for adhesives and composites due to their adhesion, mechanical properties, and their good chemical resistance. The brittleness of acrylic resins makes them less attractive than the structural materials, being much harder. For this reason, most of the resins are modified with suitable elastomers, which act as hardeners. Therefore, treatment of these compounds is necessary. In this research paper, the effect of CNCs surface on phenolic and acrylic resins were investigated to obtain an optimized surface using three different weight (wt%) ratios of CNCs. Scanning electronic microscopy (SEM), X-rays diffraction (XRD), Thermogravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the structure, and investigate different properties of CNCs. Furthermore, the Zwick/Roell Z020 model was used to investigate the adhesion properties of the phenolic and acrylic resins with CNCs.


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