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  • The Aerospace Industry

    but epoxies15 are most commonly used. 1.2.1 Epoxy chemistry An epoxy monomer is a highly strained cyclic ether, which is readily attacked by nucleophilic reagents at the electrophilic carbon centre. The epoxy polymer matrix is formed during the curing cycle which involves the reaction between epoxy monomers and a curing reagent such as carboxylic acids or acid anhydrides.16 Di(amines) are most commonly used as curing reagent with epoxies. During the curing process, permanent bonding between polymer chains begins at the gel point and leads to the formation of a rigid three-dimensional polymer network. Figure 3: Mechanism for the formation of the epoxy network. A) Nucleophilic attack of epoxy by the amine. B) Nucleophilic attack by the hydroxyl group. C) Nucleophilic attack of secondary amine. Once the crosslinks have been formed, the network cannot be re-processed or remoulded leading to difficulties in separating the polymer matrix from the fibres in CFRP’s.17 Being able to “recycle” the polymer matrix is an economic issue within the carbon fibre sector as carbon fibres are very expensive. However, this rigid network gives thermosetting polymers a favourable high modulus, excellent solvent and chemical resistance but leads to a brittle nature.18 The epoxy network lacks the ability to resist stress leading to crack propagation and failure of the resin. This is low resistance to stress is an undesirable property as presently epoxy composites are being used for structural…

    Words: 1289 - Pages: 6
  • Effects Of Composite Patching On CCT

    A final study that was explored focused on the importance of finite element analysis for analyzing the effects of composite patching on CCT. According to [S3], FE analysis is helpful because it leads to a direct computation of both the SIF and stress-distribution field. This study used 2024-T3 aluminum with a glass and epoxy composite patch. Cyclic stress was applied to patched and unpatched aluminum specimens, and the Mindlin FE Approach was used to analyze the resulting data. Results showed…

    Words: 1219 - Pages: 5
  • Benefits Of Vacuum Vained Infusion Process

    transition temperature is defined as a range of temperature (rather than a set point) where the material undergoes transformation from being a stiff and ‘glass’ like state to soft and ‘rubber’ state. This is possible due to movement of the molecules of the material inside the polymer matrix on account of gained energy from an external source. The primary importance of the glass transition temperature is that it signifies a range of temperature in which the material transformed from one state to…

    Words: 1492 - Pages: 6
  • The Compression Test Results For Granite Epoxy Specimen Chapter 2 Answers

    Chapter 5 RESULTS AND DISCUSSION 5.1 Compression Test The compression test results for Granite epoxy specimens is documented and listed in Table 5.1. Table 5.1 Compression Test results for Granite Epoxy Specimens Figure 5.1 shows the compressive strength plot of granite epoxy composite specimens without the inclusion of filler material. From the graph, it is observed that the compressive strength of the fabricated specimen’s increases up to 70% granite content and further decreases with the…

    Words: 1784 - Pages: 8
  • Tensile Strength Lab Report

    Fiber Jute/Epoxy Composite Tensile Strength (MPA) Coir/Epoxy Composite Tensile Strength (MPA) 01 8.3 26.44 28.07 02 10 28.55 27.72 03 12.5 17.73 26.28 Table 2: Tensile strength of composites Figure 6: Tensile strength of jute/coir epoxy composite The test results for tensile strengths are shown in table 2. It is seen that the tensile strength of the jute/epoxy composite increases with increase in fiber volume fraction up to 10 vol. % and then decreases at 12.5…

    Words: 713 - Pages: 3
  • Stodal Analysis Of Mono Goal Leaf Spring

    FIG.15Total deformation of Mono Composite Leaf Spring The fig: 16 shows the von-mises stress at different positions of the leaf spring and it varies from 0.0097MPa to 40.66MPa FIG.16 Von-Mises Stress Plot of E-Glass/Epoxy Composite Leaf Spring 6.1.4 Modal Analysis Modal analysis is performed to determine the natural frequencies and mode shapes of the leaf spring. After the post processing, from solution options, new anaysis is selected as modal. The analysis can be performed by Block Lancos…

    Words: 1942 - Pages: 8
  • The Similarities And Differences Of Terrazzo, Composites, And Composites

    terms of the look and feel of it. Composite flooring is composed of aggregate and a binder, also known as the matrix. The aggregate is usually stone or glass chips, and the binder is usually concrete or epoxy. You can include additives to your mixture to tailor the composite to the specific job requirements. Stone aggregate in composite flooring is sorted into sizes, so…

    Words: 1017 - Pages: 4
  • Analysis Of Dynamic Mechanical Analysis

    The viscoelastic behavior of bucky paper reinforced epoxy laminar composite materials for structural application has been evaluated through Dynamic Mechanical Analysis. The effects of heating rate, sinusoidal forces on glass transition temperature Tgwere studied. In DMA LVDT controlled sinusoidal force is applied and measures the response of the input as shown in the figure 3. It measures parameters which are the signature properties of the material under supervision like storage modulus, loss…

    Words: 2254 - Pages: 10
  • Welding Simulation

    Determining the critical factors usually takes place through accumulating the voice of customer(VOC) but in this case, the risks associated with the process were the determining factors in welding. Critical parameters (YS) is directly related to the success of the welding process and considers to be the dependent variable and the controllable factors (XS) are the independent variable. In addition, a factor of noise (n’s) that could be effective on the critical factors is also taken into account.…

    Words: 1300 - Pages: 6
  • Tensile Test Report

    equation to find Major Young’s Modulus. These values are listed Table 1 and the Major Young’s Modulus region is shown in Figure 5 (b). The final strength property found was Poisson’s Ratio (νxy) which uses Transverse Strain direction which is perpendicular to the axial/longitudinal direction. The same data points from the Major Young’s Modulus were applied but used the corrected Longitudinal and Transverse Strain values. The plot used to find Poisson’s Ratio is negative Transverse Strain vs…

    Words: 1436 - Pages: 6
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