Abstract:In this paper, we proposed a revised Mori–Tanaka model for the effective estimation of the elastic properties at lower fiber volume fraction. A review of some notable micromechanics-based models with the theories proposed by Voigt and Reuss, Hashin–Shtrikman model, Mori–Tanaka method and dilute dispersion scheme is carried out, and a critique is presented focusing on the limitations of these models. Finite Element (FE) simulations are performed using Representative Volume Element (RVE) technique to rationalize… Show more
“…The significance level chosen in this section is α = 0.05. The results showed that F 0.05 (24, 40) = 1.79, while F 0.05 (27,48) <1.79. Table 9 shows that F = 52.16> F 0.05 (24,40), as shown in Table 10, F = 17.57> F 0.05 (24,40).…”
Section: Orthogonal Optimization Of Key Parameters Of Packer Rubber Tubementioning
confidence: 93%
“…The model is based on minimum boundary conditions, nonlinear constitutive and material isotropy. 25–27 And the 3d, 2d, and mesh drawing of the rubber tube model are shown in Figure 4. Completely fixed boundary conditions are applied on the upper and lower ends of the casing, the central tube, the external side of the casing and the lower end of the rubber tube seat, and 60 MPa load is applied on the upper end of the rubber tube seat. Figure 4. Rubber tube model drawing.…”
Section: Constitutive Model Of Rubber Tube Materialsmentioning
The contact pressure distribution computation model was established to evaluate the internal and external sealing performance of packer rubber. And the results show that the internal sealing performance of packer rubber may be lower than the external side. The weights of the key parameters which influence the internal and external sealing performance of the rubber tube are obtained by calculation. The optimized structural parameters are obtained by genetic algorithm, and the sealing performance is increased by 21%. The research work is significant to improve the packer’s sealing performance and adapt deep shale gas wells ultra-high pressure fracturing conditions.
“…The significance level chosen in this section is α = 0.05. The results showed that F 0.05 (24, 40) = 1.79, while F 0.05 (27,48) <1.79. Table 9 shows that F = 52.16> F 0.05 (24,40), as shown in Table 10, F = 17.57> F 0.05 (24,40).…”
Section: Orthogonal Optimization Of Key Parameters Of Packer Rubber Tubementioning
confidence: 93%
“…The model is based on minimum boundary conditions, nonlinear constitutive and material isotropy. 25–27 And the 3d, 2d, and mesh drawing of the rubber tube model are shown in Figure 4. Completely fixed boundary conditions are applied on the upper and lower ends of the casing, the central tube, the external side of the casing and the lower end of the rubber tube seat, and 60 MPa load is applied on the upper end of the rubber tube seat. Figure 4. Rubber tube model drawing.…”
Section: Constitutive Model Of Rubber Tube Materialsmentioning
The contact pressure distribution computation model was established to evaluate the internal and external sealing performance of packer rubber. And the results show that the internal sealing performance of packer rubber may be lower than the external side. The weights of the key parameters which influence the internal and external sealing performance of the rubber tube are obtained by calculation. The optimized structural parameters are obtained by genetic algorithm, and the sealing performance is increased by 21%. The research work is significant to improve the packer’s sealing performance and adapt deep shale gas wells ultra-high pressure fracturing conditions.
“…29,30 Through mesh sensitivity analysis, it was determined that the mesh size is 2 mm. It has been proven that 31,32 the mesh size affects the simulation results when conducting finite element simulation calculations. It is indeed important to conduct a mesh convergence research to obtain the required meshing size, as this can result in significant variations in the output results.…”
Section: Finite Element Simulation Modelmentioning
A failure analysis of starting motor is performed using analytical method and finite element method. The influence of external load and material properties on the stress characteristics were discussed. For 45 steel internal spline, the maximum contact stress is greater than the allowable contact stress. This may cause internal splines failure. The bending stress and shear stress are less than the corresponding allowable stress. To be specific, when the maximum 130 N/m applied to the spline coupling in finite element analysis, the contact stress, bending stress, and shear stress are 260, 144, and 40 MPa, respectively. The corresponding allowable contact stress, allowable bending stress, and allowable shear stress are 197, 400, and 200 MPa, respectively. The stress value at the addendum and side of internal spline is maximum, which has good consistency with the failure position of experimental test. In fact, the calculation results obtained from analytical study may have the possibility of underestimating or overestimating the true stress state. This is mainly because analytical study has certain limitations. Therefore, it is necessary to use finite element method to analyze the stress state of the spline structure under design loads and determine whether its strength meets the design requirements.
“…Evaluating the mechanical stability of MJF-printed components is fundamental for determining their potential applications (Kathavate, Pawar, and Adkine 2019). With a similar significance to the surface hardness, the Young's modulus of a specimen represents its capability to resist elastic deformation when a load is applied.…”
Multi jet fusion (MJF) is an emerging powder three-dimensional (3D) printing technology with an ultrafast printing speed, in which polyamide 12 (PA12) is the main material currently utilised. Although structurally sophisticated 3D components have been printed by MJF, there are limitations due to the high cost of printing materials and inferior performance of the printed parts. Here, PA12/glass beads (PA12/GBs) composites with improved performance were manufactured via the MJF technique. Incorporating GBs effectively regulated the dimensional accuracy. Furthermore, the composite possessed lower surface roughness and higher surface hardness than neat PA12. Thermal analysis showed that the composite exhibited an enhanced decomposition temperature (390°C) and char yield (38.4 wt.%) compared to neat PA12. Remarkably, the incorporation of GBs did not improve the flame retardance of neat PA12. We identified the improved functionalities of PA12/GBs composites in terms of dimensional accuracy, surface, and thermal properties and analysed possible mechanisms for the observed increased flammability.
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