Plastics. Verification of pendulum impact-testing machines. Charpy, Izod and tensile impact-testing
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Charpy impact test
Pendulum
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Present study compares the tensile and impact characteristics of Kevlar, carbon and glass fiber reinforced composites with addition of microscale silicon carbide (SiC) within the common matrix of epoxy. The variation of tensile and impact strength values was explored for different content of SiC in the epoxy resin by weight (0, 5, 10, 15 and 20 wt%). Resulting failure characteristics were identified by assisting Charpy impact tests. The influence of interfacial adhesion between particle and fiber/matrix on failure and tensile properties was discussed from obtained results and scanning electron microscopy (SEM) figures. It is concluded from results that the content of SiC particles, and fiber types used as reinforcement are major parameters those effecting on tensile and impact resistance of composites as a result of different interface strength properties between particle-matrix and particle-fiber.
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Kevlar
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The mechanical properties of different polymer matrix composites are discussed in this research study. These composites are multiphase materials in which reinforcing elements and a polymer matrix are suitably combined. The mechanical properties of 18 PMCs, including nylon 66 reinforced with 5, 15, and 25% wt% silicon carbide (SiC) and nylon 66 reinforced with 5, 15, and 25% wt% boron carbide (B 4 C), were evaluated using an injection moulding technique at three different injection pressures in this study. The optimization of process parameters like reinforcement material, reinforcement quantity, and injection pressure to maximize the tensile and impact strength of nylon 66 composites are the main focus of this study. It is observed that the specimens 25% SiC with an injection pressure of 90 MPa has optimised tensile strength, while the specimen 5% B 4 C with an injection pressure of 90 MPa has optimised impact strength.
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PA 66/Nano-meter silica composites were prepared by means of melt blending and the mechanical properties,dynamic mechanical property and the morphology of the tensile fractured surface of the composites were studied.The results showed when the content of the nano-meter silica was 3%,the tensile strength of the composite was the highest,7.6% higher than that of PA66 matrix.The Charpy impact strength of the composite increased with the increase of the content of the nano-meter silica,and was 51.3 % higher than that of PA66 matrix when the content of SiO_2 was 4%.The storage modulus and loss modulus of the composites were both improved.The tensile fracture morphologies of the composites revealed a coarser fracture pattern.
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The natural fibers are the alternative to glass and other human-made fibers, because of their low cost and readily available from natural resources and acts as a reinforcing material for the polymer composites. Jute is the most widely used natural fibers among the various fibers due to its superior characteristics. Composite materials are made with different materials that are physically and chemically different alienated by interfaces. In this work, epoxy and polyester hybrid composites reinforced with jute and glass fiber were fabricated by hydraulic press method and their tensile and impact properties were compared. The mechanical properties of jute/glass hybrid composites with different layers such as tensile strength, percentage of elongation and impact strength were evaluated using ASTM specifications. Tensile and Charpy impact test results indicated that jute/glass fiber reinforced epoxy composites have shown optimum properties than polyester composites.
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Charpy impact test
Pendulum
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Impact assessment
Universal testing machine
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Charpy impact test
Universal testing machine
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This article deals with the experimental investigation of the mechanical properties of short jute fibers reinforced poly-propylene (PP) and ethylene-propylene-diene-monomer (EPDM) composites with various fiber contents (5, 10, 20, and 30% by weight) under Charpy impact (unnotched and notched), tensile, and three point bending tests. To increase the interfacial adhesion between the composite constituents, compatibilizer maleic anhydride poly-propylene (MAPP) is used in the fabrication process of composite specimens. The standard specimens were prepared using an injection molding machine. The results show that by adding EPDM to PP, the impact strength is increased for unnotched and notched specimens. The elongation at break is also increased for all the specimens, but the tensile and bending strength are decreased. Furthermore, by adding higher values of wt% of jute fibers, the tensile properties are improved and the impact and bending strengths are reduced as compared with pure PP.
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In this article, three types of hollow glass beads (HGB1, HGB2, and HGB3) with different sizes and distribution are used as fillers. HGB1 has a small mean particle diameter and wide distribution, HGB2 has a large diameter and medium distribution, and HGB3 has a medium diameter and narrow distribution. The tensile, notched Charpy impact and flexural properties of HGB-filled acrylnitrile-butadiene-styrene copolymer (ABS) composites are measured at room temperature. It has been found that the Young’s modulus increases linearly with increasing volume fraction φ f of the fillers. The tensile yield stress and tensile stress at break decrease gently with the increase of φ f . For ABS/HGB2 system, the tensile fracture strength energy (E tb ) is obviously lower than that of the unfilled ABS. For ABS/HGB1 system, the E tb values are somewhat lower than that of the unfilled ABS. While for ABS/HGB3 system, the E tb values are slightly higher than that of the unfilled ABS. The notched Charpy impact strength decreases quickly at φ f ≤ 5%, and then decreases gently with increasing (φ f ). On the other hand, the flexural strength increases at φ f ≤ 5%, and then it decreases with increasing φ f . In general, the effects of filler size and its distribution on these mechanical properties are not significant.
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Flexural modulus
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