K. Ramakrishnan; C. Vijayvenkatesh
Abstract
Chopped Glass Fiber (CGF) manufactured by a specification of materials in glass fiber diameter 9 to 25 micron its formed silica-based formulations of glass. Is flexible, lightweight and durability without oxidation, CGF adds enough material quantity to resist the anticipated tensile loads. The hardened ...
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Chopped Glass Fiber (CGF) manufactured by a specification of materials in glass fiber diameter 9 to 25 micron its formed silica-based formulations of glass. Is flexible, lightweight and durability without oxidation, CGF adds enough material quantity to resist the anticipated tensile loads. The hardened CGF composite mortars are inflated ductility resistant and absorbed upper load energy. CGF fiber compound mix materials consist of top strength, glass fiber implant in a cementitious matrix. CGF is another admixtures and alkali resistance. In this research evaluating the different percentages CGF mix with the cement mortar and test in different casted specimens. Appraised the specimens is increased ductility individuality, through the direct compression, tensile, elastic modules strength test. CGF mix cement mortar its high improvements of a (tensile) strength of the better composites. CGF fiber mix is a high mechanical properties consequence outcome. Con-currently fiber cement mortar composites are more efficiency of tensile and compression strength.
Masatoshi Shioya; Takashi Kajikawa; Kuniaki Takahashi; Yoshiki Sugimoto
Abstract
Development of carbon fibers from alternative precursory materials through new production processes is a recent topic of active research. In such a research, the maximum available tensile strength, i. e. the tensile strength which will be achieved after elaboration to suppress defect formation during ...
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Development of carbon fibers from alternative precursory materials through new production processes is a recent topic of active research. In such a research, the maximum available tensile strength, i. e. the tensile strength which will be achieved after elaboration to suppress defect formation during production process, is the matter of great concern. We have developed a method for determining this strength through the tensile test on a single fiber after introducing an artificial notch. In the present paper, this method has been refined. By using the refined method, the distribution of the maximum available tensile strength at various radial positions has been measured for a polyacrylonitrile-based carbon fiber. The difference between the maximum available tensile strength and the strength predicted using other methods such as those based on the fracture toughness and the fiber-length dependence of the tensile strength has also been discussed.
Hong-Cheol Kim; Da-Yeong Kim; Ji-Eun Lee; Keun Park
Abstract
According to recent advancements in additive manufacturing (AM) technology, also known as 3d printing, the role of AM has changed from the conventional rapid prototyping (RP) to direct fabrication of functional parts. The AM technology based on layer-by-layer manufacturing has a limitation in its poor ...
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According to recent advancements in additive manufacturing (AM) technology, also known as 3d printing, the role of AM has changed from the conventional rapid prototyping (RP) to direct fabrication of functional parts. The AM technology based on layer-by-layer manufacturing has a limitation in its poor surface finish and mechanical strength, especially along the thickness direction. This study proposes a new post-processing method for thermoplastic AM products with the goal of improving surface finish and mechanical strength. The proposed method, called constrained remelting, uses a metal mould with a negative shape that surrounds the printed polymer part. This mould is heated near the melting temperature of the polymer material so that the printed sample is melted and reshaped inside the mould. To evaluate changes in surface finish and mechanical strength, tensile specimens were printed and tested with various build directions; the tensile test revealed that the Z-directionally printed specimen had much lower mechanical strength than the specimens built along X- or Y- directions. Remelting experiments were then performed for the Z-directionally printed specimen under various remelting conditions (remelting temperature and initial thickness), and the resulting changes in surface finish and tensile strength were investigated. Among these remelting conditions, the 160°C remelting temperature and 4.0 mm thickness condition provided the best result where surface finish and tensile strength were improved significantly so as to be comparable to those of injection-moulded products.
Anuj Gulati; Narayan Agarwal;Sundeep K. Dhawan; Swati Varshney
Abstract
The paper aims to explore the utilization of industrial waste fly ash as a filler material into low density polyethylene (LDPE) polymer matrix with / without expanded graphite to optimize the electrostatic charge dissipative (ESD) properties as injection molded sheets. Homogeneous mixing of composite ...
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The paper aims to explore the utilization of industrial waste fly ash as a filler material into low density polyethylene (LDPE) polymer matrix with / without expanded graphite to optimize the electrostatic charge dissipative (ESD) properties as injection molded sheets. Homogeneous mixing of composite mixture has been carried out in a single screw extruder via melt blending and designed to sheet form by using an injection molding machine. The mechanical and thermal properties of the composite sheet depend on the formulation of composite material. The presence of fly ash particles and fly ash/ expanded graphite in the polymer system allows the composite sheet to acquire good mechanical and electrostatic charge dissipative properties. Static voltage decay rate and decay value measurement were carried out for LDPE and LDPE/fly ash/expanded graphite composite sheet. LDPE/fly ash/expanded graphite composite sheet having high percentage of expanded graphite showed good electrostatic charge dissipative properties. Further, structural analysis, surface morphology, thermal stability and mechanical properties have been explored by XRD, SEM, TGA and tensile testing.
Hieu Giang Le; Shyh-Chour Huang; Van Son Nguyen; Thanh-Phong Dao
Abstract
This paper describes on the effect the ratio of fillers (Na10MB3A and CaCO3) have on the tensile strength of polypropylene (PP). These fillers have been added to PP in various ratios and mixed evenly before injecting. Experimental specimens are then made by the injection process under the same conditions ...
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This paper describes on the effect the ratio of fillers (Na10MB3A and CaCO3) have on the tensile strength of polypropylene (PP). These fillers have been added to PP in various ratios and mixed evenly before injecting. Experimental specimens are then made by the injection process under the same conditions including mold temperature of 600C, filled pressure of 200MPa, and injecting speed 110cm3/s using injection process. It was discovered that the tensile strength of PP increases gradually when the ratio of fillers increases. The results revealed that the tensile strength reaches its maximum value with a certain ratio of fillers, and thereafter the strength decreases as the ratio of fillers is increased. This research also indicated that the tensile strength of PP can rise by approximately 13.5% with the addition of Na10MB3A at a ratio of 3%, and increase to 21.46% with the addition of a 4% ratio of CaCO3. They are expected that experimental samples are the usefully promising materials for automotive components. In the future work, this study will further carry out an investigation into glass filler -reinforced PP and determine the fatigue life limit of the fillers-reinforced PP material.
Satnam Singh; Pardeep Kumar;S.K. Jain
Abstract
Composites are one of the most advanced and adaptable engineering materials. The strength of any composite depends upon volume/weight fraction of reinforcement, L/D ratio of fibers, orientation angles and other factors. The present work focuses on determination of mechanical properties of pure epoxy ...
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Composites are one of the most advanced and adaptable engineering materials. The strength of any composite depends upon volume/weight fraction of reinforcement, L/D ratio of fibers, orientation angles and other factors. The present work focuses on determination of mechanical properties of pure epoxy and random oriented glass fiber (mat) reinforced epoxy at 10% and 20% weight fractions of glass fibers. The test specimens were prepared and tested according to ASTM standards. The experimental results revealed that with increase in weight fraction of reinforcement, the tensile strength and flexural strength increased by 14.5 % and 123.65% for 20 % glass reinforced composites over pure epoxy. The numerical results obtained were in good agreement to the experimental results. However increased reinforcement increases the brittleness of material which may results in low impact strength. This study further can be used to optimize the weight fraction of glass fibers, to achieve a combination of strength without compromising the impact strength of composites.
Andrew E. Frerichs; Alan M. Russell
Abstract
The yield strength, ultimate tensile strength, elastic modulus, and strain rate sensitivity of pure Sr metal in the as-extruded condition were determined by tensile testing and compared with the properties of other alkaline metals. Two strain rates were used for testing. At a strain rate of 6.5×10 ...
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The yield strength, ultimate tensile strength, elastic modulus, and strain rate sensitivity of pure Sr metal in the as-extruded condition were determined by tensile testing and compared with the properties of other alkaline metals. Two strain rates were used for testing. At a strain rate of 6.5×10 -4 s -1 , Sr has a 0.2% offset yield strength of 71.6 MPa, an ultimate tensile strength of 88.1 MPa, and 10.4% elongation at fracture. At a strain rate of 6.3×10 -3 s -1 , Sr has a 0.2% offset yield strength of 81.9 MPa, and ultimate tensile strength of 101.5 MPa, and 5.0% elongation at fracture. The strain rate sensitivity was determined to be 0.059.