The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform
Zhu Xuezhong - One of the best experts on this subject based on the ideXlab platform.
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halogen free unsaturated polyester Glass Reinforced Plastic molding material
2013Co-Authors: Zhu XuezhongAbstract:The invention provides a halogen-free unsaturated polyester Glass Reinforced Plastic molding material, belonging to the technical field of polymer materials. The molding material comprises the following raw materials in parts by weight: 46-51 parts of unsaturated polyester resins, 32-36.6 parts of low shrinkage additive, 3-5 parts of thermoPlastic styrene butadiene rubber (SBS), 0.65-1.1 parts of initiator, 0.006-0.011 part of polymerization inhibitor, 0.16-0.3 part of thickening agent, 170-210 parts of filler, 2.3-3.1 parts of release agent and 36-44 parts of Reinforced fibers. The molding material has the advantages that the molding material is characterized in that the molding material has good strength, low shrinkage and excellent electrical property and is halide-free and can be applied to such parts as anticorrosion shells of autos and electrical appliances.
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halogen free flame retardant phenolic epoxy Glass Reinforced Plastic molding material
2013Co-Authors: Zhu XuezhongAbstract:The invention provides a halogen-free flame retardant phenolic epoxy Glass Reinforced Plastic molding material, belonging to the technical field of polymer materials. The molding material comprises the following raw materials in parts by weight: 50-54 parts of phenolic epoxy resins, 10-15 parts of melamine resins, 4-8 parts of curing agent, 0.8-1.5 parts of curing accelerator, 6-9 parts of phosphate ester, 3-4 parts of phosphate, 1.3-2.2 parts of release agent, 44-48 parts of mineral filler, 1.1-1.5 parts of reinforcing agent and 25-28 parts of Reinforced fibers. The molding material has the beneficial effects that the molding material has the characteristics of good heat resistance, excellent self-extinguishing effect, good strength and convenience in molding; and through tests, the bending strength is 88MPa, the heat deformation temperature is 240 DEG C and the flame retardance reaches grade V-0 (UL-94-V-0 1.6mm).
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preparation method of halogen free unsaturated polyester Glass Reinforced Plastic molding material
2013Co-Authors: Zhu XuezhongAbstract:The invention provides a preparation method of a halogen-free unsaturated polyester Glass Reinforced Plastic molding material, belonging to the technical field of preparation of polymer materials. The preparation method is characterized by firstly throwing unsaturated polyester resins and a low shrinkage additive, which are weighed in parts by weight, into a beater to be quickly stirred, then adding an initiator, p-benzoquinone and a thickening agent, which are weighed in parts by weight, continuing stirring, then transferring the mixture to a kneader to be kneaded, then adding a filler, thermoPlastic styrene butadiene rubber and a release agent, which are weighed in parts by weight, to the kneader, continuing kneading and finally adding Reinforced fibers weighed in parts by weight and then kneading the materials, thus obtaining the halogen-free unsaturated polyester Glass Reinforced Plastic molding material. The molding material has the advantages that the molding material is characterized in that the molding material has good strength, low shrinkage and excellent electrical property and is halide-free and can be applied to such parts as anticorrosion shells of autos and electrical appliances.
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preparation method of halogen free flame retardant phenolic epoxy Glass Reinforced Plastic molding material
2013Co-Authors: Zhu XuezhongAbstract:The invention provides a preparation method of a halogen-free flame retardant phenolic epoxy Glass Reinforced Plastic molding material, belonging to the technical field of preparation of polymer materials. The preparation method is characterized by firstly throwing weighed 44-48 parts of mineral filler, 25-28 parts of Reinforced fibers and 1.1-1.5 parts of reinforcing agent by weight into a container to be mixed for 10-20 minutes, then throwing weighed 50-54 parts of phenolic epoxy resins, 10-15 parts of melamine resins, 4-8 parts of curing agent, 0.8-1.5 parts of curing accelerator, 6-9 parts of phosphate ester, 3-4 parts of phosphate and 1.3-2.2 parts of release agent by weight in sequence, continuing mixing for 15-25 minutes, then transferring the mixture to an open mill to undergo hot mixing for 12-14 minutes and then carrying out tablet drawing, cooling and grinding, thus obtaining the halogen-free flame retardant phenolic epoxy Glass Reinforced Plastic molding material. The molding material has the beneficial effects that the molding material has the characteristics of good heat resistance, excellent self-extinguishing effect, good strength and convenience in molding; and through tests, the bending strength is 88MPa, the heat deformation temperature is 240 DEG C and the flame retardance reaches grade V-0 (UL-94-V-0 1.6mm).
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preparation method of halogen free flame retardant no ammonia release phenolic Glass Reinforced Plastic material
2013Co-Authors: Zhu XuezhongAbstract:The invention discloses a preparation method of a halogen-free flame-retardant no-ammonia-release phenolic Glass Reinforced Plastic material, and belongs to the technical field of preparation of high-molecular materials. The preparation method comprises the following steps of: firstly, putting 40-44 parts of phenolic resin, 26-30 parts of thermosetting phenol resin, 4-5 parts of epoxy resin, 1.8-3.2 parts of metallic oxide, 1.5-2.6 parts of composite mold-releasing agent, 45-49 parts of mineral filler, 3-5 parts of silicon carbide and 28-33 parts of Reinforced fiber weighed according to the weight parts into a container with a stirring device; mixing 20-30 minutes, and controlling the rotating speed of the stirring device to be 400-600n/min, thereby obtaining a mixture; transferring the mixture to an open mill for open milling for 12-16 minutes; then carrying out piece pulling, cooling to normal temperature, and grinding to obtain the halogen-free flame-retardant no-ammonia-release phenolic Glass Reinforced Plastic material. The halogen-free flame-retardant no-ammonia-release phenolic Glass Reinforced Plastic material has the advantages that the heat resistance is good, the strength is ideal and the ammonia can not be released in forming; and by test, the bending strength is more than 85MPa, the heat distortion temperature is higher than or equal to 240 DEG C, and the flame retardancy reaches V-0 grade (UL-94-V-01.6mm).
G J Turvey - One of the best experts on this subject based on the ideXlab platform.
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a computational and experimental analysis of the buckling postbuckling and initial failure of pultruded grp columns
Computers & Structures, 2006Co-Authors: G J Turvey, Y ZhangAbstract:Abstract A two-dimensional finite element (FE) model was developed and nonlinear FE analyses were carried out, using the ANSYS software, to predict the buckling, postbuckling and initial failure loads of pultruded Glass Reinforced Plastic (GRP) wide flange (WF) columns. Phenomenological failure criteria were proposed to predict failure initiation at the web-flange junctions of pultruded GRP WF columns, whereas the Tsai–Wu failure criterion was used for the web and flanges. Initial failure analysis was carried out with reasonable success as a post-processing operation on the nonlinear analysis results. The numerical predictions of the buckling, postbuckling and initial failure loads of pultruded GRP WF columns were in reasonably good agreement with the experimental results.
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review of tests on bolted joints between pultruded grp profiles
Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2004Co-Authors: G J Turvey, C CooperAbstract:Fifty-nine moment–rotation tests on bolted beam-to-column joints between pultruded Glass-Reinforced Plastic (GRP) profiles form the basis of the review. Joint test methods are discussed. The joints are sub-divided into five groups. The joints in each group are described and their test data appraised. Sketches of the joints and summaries of the test data are presented in tables. Three broadly similar categories of joint (web cleat, web and flange cleat and high stiffness and strength joints) are identified. For each category, the joint test data—initial rotational stiffness, ultimate moment and ultimate rotation—are compared. The variations in the test data highlight the need for further testing of a variety of nominally identically in order to improve both understanding of joint behaviour and joint design. A round robin exercise, in consultation with pultruders, fabricators and designers, is suggested as a means of achieving this goal.
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euler buckling of partially stiffened pultruded grp columns a comparison of shell finite element and beam column model predictions
Advanced Polymer Composites for Structural Applications in Construction#R##N#Acic 2004, 2004Co-Authors: G J Turvey, A AfifiAbstract:A two-dimensional shell finite element (FE) model and a one-dimensional beamcolumn model are presented for the global (Euler) buckling analysis of partially stiffened pultruded GRP (Glass Reinforced Plastic) WF (Wide Flange) columns subjected to uniform uniaxial compression. By comparison with the buckling loads predicted with the two-dimensional FE model, it is shown that the beam-column model gives accurate predictions of the global buckling loads of simply supported and clamped columns partially stiffened with Type 1 and Type 2 GRP and CFRP (Carbon Fibre Reinforced Plastic) stiffeners. The results obtained also show that Type 1 stiffeners are more effective in raising the buckling load for simply supported columns and, moreover, that there is little benefit in stiffening more than three-quarters of the length of the column. However, for columns with clamped ends both types of stiffener produce similar increases in the buckling load and the greatest increase in the buckling load occurs when the column is stiffened over the whole of its length. Finally, and despite its accuracy, it is shown that the beam-column model is likely to be of limited use for columns with CFRP stiffeners which extend over their whole length, because local or combined mode rather than global buckling occurs for practical column lengths of 3 - 3.5m.
Y Zhang - One of the best experts on this subject based on the ideXlab platform.
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a computational and experimental analysis of the buckling postbuckling and initial failure of pultruded grp columns
Computers & Structures, 2006Co-Authors: G J Turvey, Y ZhangAbstract:Abstract A two-dimensional finite element (FE) model was developed and nonlinear FE analyses were carried out, using the ANSYS software, to predict the buckling, postbuckling and initial failure loads of pultruded Glass Reinforced Plastic (GRP) wide flange (WF) columns. Phenomenological failure criteria were proposed to predict failure initiation at the web-flange junctions of pultruded GRP WF columns, whereas the Tsai–Wu failure criterion was used for the web and flanges. Initial failure analysis was carried out with reasonable success as a post-processing operation on the nonlinear analysis results. The numerical predictions of the buckling, postbuckling and initial failure loads of pultruded GRP WF columns were in reasonably good agreement with the experimental results.
Necmetti Tarakcioglu - One of the best experts on this subject based on the ideXlab platform.
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burst failure load of composite pressure vessels
Composite Structures, 2009Co-Authors: Aziz Onde, Onu Sayma, Tolga Doga, Necmetti TarakciogluAbstract:Abstract In this study, optimal angle-ply orientations of symmetric and antisymmetric [ θ /− θ ] s shells designed for maximum burst pressure were examined. Burst pressure of filament wound composite pressure vessels under alternating pure internal pressure was investigated. The study deals with the influences of temperature and winding angle on filament wound composite pressure vessels. Finite element method and experimental approaches were employed to verify the optimum winding angles. An elastic solution procedure based on Lekhnitskii’s theory was developed in order to predict the burst failure pressure of the pressure vessels. The Tsai-Wu failure criterion, maximum strain and stress theories were applied for verifying the burst failure pressure of tubes. The solution was presented and discussed for various orientation angles. Glass Reinforced Plastic (GRP) pipes were manufactured by E-Glass–epoxy and tested for the closed-ended condition. Test specimens had four layers, which had various orientation angles. The layers were oriented symmetrically and antisymmetrically for, [45°/−45°] s , [55°/−55°] s , [60°/−60°] s , [75°/−75°] s and [88°/−88°] s orientations. For this study, a PLC controlled hydraulic pressure testing machine has been utilized. The hygrothermal and other mechanical properties were measured on E-Glass–epoxy composite flat layers. Some analytical and experimental solutions were compared with the finite element solutions, in which commercial software ANSYS 10.0 was utilized; close results were obtained between analytical and experimental solutions for some orientations.
Ye Fadong - One of the best experts on this subject based on the ideXlab platform.
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halogen free flame retardation polystyrene modified unsaturated polyester Glass Reinforced Plastic molding compound
2013Co-Authors: Ye FadongAbstract:A halogen-free flame-retardation polystyrene-modified unsaturated polyester Glass Reinforced Plastic molding compound belongs to the technical field of thermosetting molding compound, and is composed of the following raw materials by weight parts: 105-110 parts of unsaturated polyester resin, 72-76 parts of low-contraction additive, 0.1-1.5 parts of an initiator, 0.01-0.02 parts of a polymerization inhibitor, 0.2-0.4 parts of thickening agent, 450-520 parts of filling materials, 20-30 parts of polystyrene modifier, 30-45 parts of a fire retardant, 7.5-10 parts of a mold lubricant and 85-105 parts of Reinforced fibers. The halogen-free flame-retardation polystyrene-modified unsaturated polyester Glass Reinforced Plastic molding compound provided by the invention has characteristics of good intensity, high toughness and excellent electrical property.