scholarly journals Preparation and properties of silicone rubber materials with foam/solid alternating multilayered structures

2021 ◽  
Author(s):  
Wenhuan Zhang ◽  
Zhaoping Deng ◽  
Hongwei Yuan ◽  
Shikai Luo ◽  
Huayin Wen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silicone Rubber ◽  
Cellular Structure ◽  
Cellular Structures ◽  
Compressive Property ◽  
Solid Layer ◽  
Multilayered Structures ◽  
Element Analysis ◽  
Morphology And Mechanical Properties

AbstractIn this paper, silicone rubber materials with foam/solid alternating multilayered structures were successfully constructed by combining the two methods of multilayered hot-pressing and supercritical carbon dioxide (SCCO2) foaming. The cellular morphology and mechanical properties of the foam/solid alternating multilayered silicone rubber materials were systematically studied. The results show that the growth of the cell was restrained by the solid layer, resulting in a decrease in the cell size. In addition, the introduction of the solid layer effectively improved the mechanical properties of the microcellular silicone rubber foam. The tensile strength and compressive strength of the foam/solid alternating multilayered silicone rubber materials reached 5.39 and 1.08 MPa, which are 46.1% and 237.5% of the pure silicone rubber foam, respectively. Finite element analysis (FEA) was applied and the results indicate that the strength and proportion of the solid layer played important roles in the tensile strength of the foam/solid alternating multilayered silicone rubber materials. Moreover, the small cellular structures in silicone rubber foam can provided a high supporting counterforce during compression, meaning that the microcellular structure of silicone rubber foam improved the compressive property compared to that for the large cellular structure of silicone rubber foam.

scholarly journals Mechanical Properties of a Chiral Cellular Structure with Semicircular Beams

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2887
Author(s):  
Yalei Bai ◽  
Tong Zhao ◽  
Chengxu Yuan ◽  
Weidong Liu ◽  
Haichao Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Elastic Properties ◽  
Cellular Structure ◽  
Raw Material ◽  
Cellular Structures ◽  
Tensile Shear ◽  
Element Analysis ◽  
Chiral Structure ◽  
Shear Moduli

Compliant cellular structures are good candidates for morphing applications. This paper proposes a novel chiral cellular structure composed of circular beams with great elastic properties and potential for morphing. The tensile and shear elastic properties of the structure are studied through theoretical derivations and then verified by finite element analysis. Results show that this novel chiral structure exhibits extremely low in-plane tensile and shear moduli, which are many orders of magnitude lower than that of the raw material. The structure also shows tensile–shear and shear–tensile coupling effects that cannot be ignored. The tensile and shear properties of the structure can provide a reference for employing this structure in engineering applications.

scholarly journals Correlation Between the Structure and Compressive Property of PMMA Microcellular Foams Fabricated by Supercritical CO2 Foaming Method

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 315 ◽  
Author(s):  
Ruizhi Zhang ◽  
Ju Chen ◽  
Yuxuan Zhu ◽  
Jian Zhang ◽  
Guoqiang Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Size ◽  
Supercritical Co2 ◽  
Cellular Structure ◽  
Experimental Testing ◽  
Element Model ◽  
Cellular Structures ◽  
Compressive Property ◽  
Compressive Properties ◽  
Microcellular Foams

In this study, we fabricated poly (methyl methacrylate) (PMMA) microcellular foams featuring tunable cellular structures and porosity, through adjusting the supercritical CO2 foaming conditions. Experimental testing and finite element model (FEM) simulations were conducted to systematically elucidate the influence of the foaming parameters and structure on compressive properties of the foam. The correlation between the cellular structure and mechanical properties was acquired by separating the effects of the cell size and foam porosity. It was found that cell size reduction contributes to improved mechanical properties, which can be attributed to the dispersion of stress and decreasing stress concentration.

High molar mass silicone rubber reinforced with montmorillonite clay masterbatches: Morphology and mechanical properties

2010 ◽  
Vol 46 (5) ◽  
pp. 881-890 ◽  
Author(s):  
Manuela L.Q.A. Kaneko ◽  
Rafaelle Bonzanini Romero ◽  
Maria do Carmo Gonçalves ◽  
Inez V.P. Yoshida
Keyword(s):  
Mechanical Properties ◽  
Silicone Rubber ◽  
Molar Mass ◽  
Montmorillonite Clay ◽  
High Molar Mass ◽  
Morphology And Mechanical Properties

Preparation and Properties of Wood Flour/HDPE Composites Using C5-g-MAH as Compatilizer

2013 ◽  
Vol 779-780 ◽  
pp. 170-173
Author(s):  
Lan Cen ◽  
Fu Lin Chen ◽  
You Ming Cao ◽  
Hui Xue Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
High Density Polyethylene ◽  
Wood Flour ◽  
Bend Strength ◽  
Grafting Ratio ◽  
Melt Grafting ◽  
Compatibilizing Effect ◽  
Morphology And Mechanical Properties ◽  
Properties Of Composites

Maleic anhydride grafted C5 petroleum resin (C5-g-MAH) was prepared using peroxide as an initiator by melt grafting process, and was incorporated as a compatibilizer into Wood Flour/High Density Polyethylene (WF/HDPE) composites. The effect of second monomers and C5-g-MAHs on the morphology and mechanical properties of composites was investigated. Results showed that the presence of a second monomer, Triallyl isocyanurate (TAI), Butyl acrylate (BA) or Trimethylol proane trimethacrylate (TMPTMA), in the grafting system gave rise to higher grafting ratio of C5-g-MAHs compared to that without a second monomer. The highest grafting ratio was obtained as TMPTMA content being 0.20~0.35wt% based on C5. The addition of C5-g-MAHs into WF/HDPE resulted in improved mechanical properties. Meanwhile the composite containing C5-g-MAH with 0.30wt% TMPTMA exhibits the most significant improvement in all mechanical properties with tensile strength and bend strength increasing up to 18% and 20% respectively, which is concomitant with the finer morphology structure observed by SEM, suggesting the remarkable compatibilizing effect of C5-g-MAH with TMPTMA for WF/HDPE composites.

Effect of Blowing Agent and Polyethylene Glycol on Cellular Structure and Mechanical Properties of Chloroprene Rubber

2012 ◽  
Vol 217-219 ◽  
pp. 517-521 ◽  
Author(s):  
Hong Ling Yi ◽  
Ting Wei ◽  
Lin Heng ◽  
Bai Cun Zheng
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Zinc Oxide ◽  
Polyethylene Glycol ◽  
Cellular Structure ◽  
Foaming Agent ◽  
Blowing Agent ◽  
Swell Ratio ◽  
Closed Cell ◽  
Chloroprene Rubber

In this paper the closed-cell sponge of chloroprene rubber(CR) were produced by foaming agent Azodicarbonamide (AC) and Oxybis (benzene sulfonyl) hydrazide (OBSH). The blend blowing agent AC/OBSH was more effective than the pure AC as it could produce chloroprene foam with greater cell porosity, more uniform and better cell distributions. The CR foam prepared with AC/OBSH had better tensile strength and tear strength than pure AC, but higher Shore C hardness. The Polyethyene glycol (PEG) modified Zinc Oxide (ZnO) could accelerate curing and foam process simultaneously. Increase the content of PEG, CR foam has bigger swell ratio, smaller cell size, and better softness.

Mechanical Properties of Silicone Rubber / Hydroxyapatite Composite

2021 ◽  
Vol 876 ◽  
pp. 77-81
Author(s):  
Siti Zaleha Sa’ad ◽  
Norazura Ibrahim ◽  
Nurul Nadiah Aris
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Cancellous Bone ◽  
Silicone Rubber ◽  
Medical Application ◽  
Bone Replacement ◽  
Hydroxyapatite Composite ◽  
Great Performance

Silicone rubber (SR) and hydroxyapatite (HA) are two well-known material that have been used as bone replacement. The flexibility and compatibility of SR and HA respectively, shows great performance and improvement in medical application. This paper investigate the mechanical properties of SR and HA composite with various phr loading of HA (0 - 30 phr). The results indicate that, HA loading phr of 25 phr and 30 phr were in the range of tensile strength of 5.76 MPa and 3.15 MPa respectively. Also, the hardness value of all the percentage loading of HA were above the hardness value of human vertebrae cancellous bone.

Finite Element Analysis of Dynamic Splitting Tensile Mechanical Properties of Reinforced Concrete

2014 ◽  
Vol 941-944 ◽  
pp. 695-700
Author(s):  
Xiao Yan Song ◽  
Pei Wen Zhang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Strength ◽  
Reinforced Concrete ◽  
Strain Rate ◽  
Failure Mode ◽  
Splitting Tensile Strength ◽  
Reinforcement Ratio ◽  
Element Analysis

Finite element analysis is carried out on the dynamic splitting tensile mechanical properties of reinforced concrete with LS-DYNA. The impact of strain rate and reinforcement ratio on the dynamic tensile strength and failure mode of reinforced concrete is considered in the calculation. The result shows that the form of reinforcement and reinforcement ratio has a greater impact on the failure mode and tensile strength of concrete. The dynamic splitting tensile strength of reinforced concrete has a certain strain rate effect and its splitting tensile strength increases with the strain rate; the splitting tensile strength of reinforced concrete also increases with its reinforcement ratio.

Preparation of R-BABP Polyimide Fibers via Wet Spinning of Polyamide Acid

2020 ◽  
Vol 869 ◽  
pp. 266-272
Author(s):  
Gleb Vaganov ◽  
Andrei Didenko ◽  
Elena Ivan’kova ◽  
Elena Popova ◽  
Vladimir Elokhovskii ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ethylene Glycol ◽  
Coagulation Bath ◽  
Wet Spinning ◽  
Structure And Properties ◽  
Polyimide Fibers ◽  
Thermal Imidization ◽  
Morphology And Mechanical Properties

A polyamide acid (PAA) based on diamine 4,4'-bis (4-aminophenoxy) diphenyl and 1,3-bis (3',4-dicarboxyphenoxy) benzene dianhydride was synthesized. PAA fibers were obtained by wet spinning. Then, these fibers were converted into polyimide by thermal imidization. Dependence of the structure and properties of fibers on the die drawing and the composition of the coagulation bath was studied. It is shown that the composition of the coagulation bath has a significant effect on the morphology and mechanical properties of polyimide (PI) fibers. To obtain defect-free fibers, a coagulation bath consisting of ethylene glycol/ethanol at 50/50 vol. % was found to be optimal. An increase in the die drawing of fibers from 1 to 2 times leads to an increase in tensile strength and strain at break of the polyimide fibers.

Effects of dynamic mold temperature control on melt pressure, cellular structure, and mechanical properties of microcellular injection-molded parts: An experimental study

2019 ◽  
Vol 38 (5-6) ◽  
pp. 111-130
Author(s):  
Guiwei Dong ◽  
Guoqun Zhao ◽  
Junji Hou ◽  
Guilong Wang ◽  
Yue Mu
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Temperature Control ◽  
Cellular Structure ◽  
Weld Line ◽  
Mold Temperature ◽  
Cell Diameter ◽  
Cooling Stage ◽  
Molded Parts

In this work, the effects of dynamic mold temperature control (DMTC) on melt pressure, cellular structure, and mechanical properties of microcellular injection molding (MIM)-molded parts are investigated experimentally. It is found that with the increase of the mold temperature, the duration of foaming pressure in the cooling stage increases. Meanwhile, the average cell diameter and cell diameter dispersion increases as well as the cell density decreases in MIM molded parts. The turning point of mold temperature after which the foaming pressure in the cooling stage and the cellular structure in MIM molded parts generate a significant change is around the glass transition temperature of the used plastic material. Under DMTC conditions, with the increase of mold temperature, the tensile strength, flexural strength, and impact strength of MIM molded specimens of single gate without weld line change a little, while the tensile strength, flexural strength of MIM molded specimens of double gates with weld line increase obviously. When the mold temperature increases to 120°C and over, the tensile strength, flexural strength of MIM molded specimens of double gates with weld line reach an equivalent level of specimens of single gate without weld line.

scholarly journals Investigations of Mechanical Properties of API P110 Steel Casing Tubes Operated in Deep-Sea Sour Condensate Well Conditions

2020 ◽  
Vol 27 (3) ◽  
pp. 121-129
Author(s):  
Yao Zilin ◽  
Wang Yu ◽  
Yang Xuefeng ◽  
Gao Anping ◽  
Zhang Rong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Tensile Strength ◽  
Yield Strength ◽  
Deep Sea ◽  
Performance Model ◽  
Continuous Change ◽  
Element Analysis ◽  
Equivalent Yield

AbstractDue to the complexity of the marine environment, in deep-sea drilling, all kinds of strings are corroded by different deep-sea conditions for a long time, accompanied by high temperature and high pressure, which lead to the continuous change of mechanical properties of materials. In order to solve the problem that the material mechanical parameters cannot be accurately described in the performance analysis of the casing, deep-sea simulated corrosion and material damage experiments of P110 material were carried out in this paper. Mass loss and tensile experiments on corrosion-damaged test pieces were conducted under different corrosion experimental periods. The changes in mechanical properties of the material were analyzed. Equations of the variation of the equivalent yield strength and the equivalent tensile strength were obtained. The results show that the equivalent yield strength and the equivalent tensile strength decrease with the increase of the weight loss rate. Based on the experimental results and finite element analysis, a method for establishing the material corrosion model was proposed in this paper. The deep-sea drilling corrosion performance model of P110 material was established, which greatly reduced the error caused by the material uniformity assumption in finite element analysis. This paper provides a theoretical basis for the analysis of reliability and life of P110 materials in wells.

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