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Dynamic Impact Compressive Behavior Investigation of sisal fiber-reinforced Coral Seawater Concrete

Journal of Wuhan University of Technology(Materials Science) 2023年第5期38卷 1034-1043页

作者： MA Haiyan TAN Yongshan YU Hongfa YUE Chengjun ZHANG Yan Department of Airport and Civil Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Civil Science and Engineering Yangzhou UniversityYangzhou 225i27China School of Civil Engineering Southeast UniversityNanjing 21118China

Split Hopkinson pressure bar(SHPB)was used to investigate the dynamic compressive properties of sisal fiber reinforced coral aggregate concrete(SFCAC).The results showed that,with the increase of strain rate,the dynamic compressive strength,peak strain and toughness index of SFCAC are all greater than its static properties,indicating that SFCAC is a kind of rate-sensitive *** the sisal fiber was blended,the failure mode showed obvious *** high strain rates,the SFCAC without sisal fiber specimen was comminuted,and the SFCAC showed a"cracked without breaking"*** results indicated that the sisal fiber played a significant role in reinforcing and strengthening the properties of *** finite element software LS-DYNA was used to simulate two working conditions with strain rates of 78 and 101 *** stressstrain curves and failure patterns obtained were in good agreement with the experimental results.

关键词： coral aggregate concrete sisal fiber dynamic compressive strain-rate effect

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Effects of Strain Rate and fiber Content on the Dynamic Mechanical Properties of sisal fiber Cement-Based Composites

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Journal of Renewable Materials 2023年第1期11卷 393-410页

作者： Yubo Zhang Ping Lei Lina Wang Jiqing Yang Facuty of Architecture and Civil Engineering Yunnan Agricultural UniversityKunming650000China

In this paper,a split Hopkinson pressure bar(SHPB)was used to investigate the dynamic impact mechanical behavior of sisal fiber-reinforced cement-based composites(SFRCCs),and the microscopic damage evolution of the composites was analyzed by scanning electron microscopy(SEM)and energy-dispersive X-ray spectrome-try(EDS).The results show that the addition of sisal fibers improves the impact resistance of cement-based composite *** with ordinary cement-based composites(OCCs),the SFRCCs demonstrate higher post-peak strength,ductility,and energy absorption capacity with higher fiber ***,the SFRCCs are strain rate sensitive materials,and their peak stress,ultimate strain,and energy integrals all increase with increasing strain *** the perspective of fracture failure characteristics,the failure of OCCs is dominated by the brittle failure of crystal *** contrast,the failure mode of the SFRCCs changes to microscale matrix cracks,multi-scale pull-out interface debonding of fibers(fine filaments and bundles),and mechanical *** research provides an experimental basis for the engineering application of high-performance and green cement-based composites.

关键词： sisal fiber cement-based composites SHPB energy integration microstructure damage evolution law

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Production of Manganese Peroxidase by Trametes villosa on Unexpensive Substrate and Its Application in the Removal of Lignin from Agricultural Wastes

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Advances in Bioscience and Biotechnology 2014年第14期5卷 1067-1077页

作者： Marilia Lordelo Cardoso Silva Volnei Brito de Souza Veronica da Silva Santos Helio Mitoshi Kamida Joao Ronaldo T.de Vasconcellos-Neto Aristoteles Goes-Neto Maria Gabriela Bello Koblitz Technology Department State University of Feira de Santana(UEFS)Feira de SantanaBrasil Biology Department State University of Feira de Santana(UEFS)Feira de SantanaBrasil Food Technology Department Federal University of the State of Rio de Janeiro(UNIRIO)Rio de JaneiroBrasil

Manganese peroxidase (MnP) is a ligninolytic enzyme that is involved in the removal of lignin from the cell wall of plants. This removal facilitates the access of hydrolytic enzymes to the carbohydrate polymers that are hydrolyzed to simple sugars, which allows the subsequent fermentation to obtain bioproducts, such as ethanol. In this work, response surface methodology (RSM) was employed to optimize the culture conditions on unexpensive substrate for MnP secretion by Trametes villosa. Three independent variables were evaluated (i.e., temperature, moisture content and pH). The crude extract containing MnP was used in the delignification experiment and it caused a reduction in lignin content for all residues tested: 35.05 ± 1.45 (%) for the sugar cane bagasse;63.11 ± 0.06 (%) for the sisal fiber and 39.61 ± 0.39 (%) for the coconut shell, under the reaction conditions tested after 4 hours of fermentation. The preliminary results exhibited the potential application of this enzyme in the removal of lignin from plant residues. However, the conditions should be evaluated and optimized for each residue type.

关键词： Ligninolytic Enzymes Basidiomycete Sugarcane Bagasse Coconut Shell sisal fiber

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剑麻纤维/聚砜/酚醛树脂复合摩擦材料的动态力学性能研究

剑麻纤维/聚砜/酚醛树脂复合摩擦材料的动态力学性能研究

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2010年全国高分子材料科学与工程研讨会

作者：熊雪梅韦春桂林理工大学材料科学与工程学院有色金属及材料加工新技术教育部重点实验室

＜正＞摩擦材料主要是由树脂基体、纤维增强材料、摩擦性能调节剂及填料等四类组分混合后热压而成。由于酚醛树脂（PF）在耐热性、力学性能、成型加工性能和成本方面具有优势,成为目前聚合物基摩擦材料最常用的粘结剂。作为基体树脂,其... 详细信息

＜正＞摩擦材料主要是由树脂基体、纤维增强材料、摩擦性能调节剂及填料等四类组分混合后热压而成。由于酚醛树脂（PF）在耐热性、力学性能、成型加工性能和成本方面具有优势,成为目前聚合物基摩擦材料最常用的粘结剂。作为基体树脂,其作用是将材料中各组分粘结

关键词： polysulfone phenolic resin sisal fiber dynamic mechanical property

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