Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

Xinyu, Hao; Zhang, Guangdong; Deng, Tong

doi:10.3390/polym15153310

Cited by 3 publications

(2 citation statements)

References 44 publications

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“…The current work is promising in that it can be extended to the revised design issues and generate real-time optimization for advanced FRPC structure design [35,36]. It can also be utilized together with fiber printing techniques for applications in additive manufacturing [37].…”

Section: Discussionmentioning

confidence: 99%

Compliance Prediction for Structural Topology Optimization on the Basis of Moment Invariants and a Generalized Regression Neural Network

Zhao,

Chen,

Dong

2023

Entropy

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Topology optimization techniques are essential for manufacturing industries, such as designing fiber-reinforced polymer composites (FRPCs) and structures with outstanding strength-to-weight ratios and light weights. In the SIMP approach, artificial intelligence algorithms are commonly utilized to enhance traditional FEM-based compliance minimization procedures. Based on an effective generalized regression neural network (GRNN), a new deep learning algorithm of compliance prediction for structural topology optimization is proposed. The algorithm learns the structural information using a fourth-order moment invariant analysis of the structural topology obtained from FEA at different iterations of classical topology optimization. A cantilever and a simply supported beam problem are used as ground-truth datasets, and the moment invariants are used as independent variables for input features. By comparing it with the well-known convolutional neural network (CNN) and deep neural network (DNN) models, the proposed GRNN model achieves a high prediction accuracy (R2 > 0.97) and drastically shortens the training and prediction cost. Furthermore, the GRNN algorithm exhibits excellent generalization ability on the prediction performance of the optimized topology with rotations and varied material volume fractions. This algorithm is promising for the replacement of the FEA calculation in the SIMP method, and can be applied to real-time optimization for advanced FRPC structure design.

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Section: Discussionmentioning

confidence: 99%

Compliance Prediction for Structural Topology Optimization on the Basis of Moment Invariants and a Generalized Regression Neural Network

Zhao,

Chen,

Dong

2023

Entropy

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“…Where, 𝜂𝜂0 -Zero shear viscosity (Pa. s), 𝜂𝜂∞ -Infinity shear viscosity (Pa. s), n -exponent, a -transition parameter, 𝛼𝛼𝑇𝑇 -temperature dependence, 𝜆𝜆 -time constant (s) , cs -temperature sensitivity parameter [9].…”

Section: Feedblock and Coat Hanger Die Geometrymentioning

confidence: 99%

Investigation of Co-Extrusion Using a Coat Hanger Die with Different Feedblock Cross-Section

Sharipkhan,

Clifford,

Perveen

et al. 2024

KEM

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When using the coat hanger die method for co-extrusion, the biggest challenges often involve maintaining the uniformity of the velocity distribution at the outlet of the die and ensuring the stability of the interface plane. This paper investigates the effect of different cross-section of feed channels connected to the coat hanger die on the velocity and pressure distribution of the flow at different parts of the die. Co-extrusion of LLDPE (Linear Low Density Polyethylene) and HDPE (High Density Polyethylene) polymers is simulated using ANSYS software 2020 R2 for coat hanger die design with rectangular and circular cross-sections inlet geometry; the results are compared for Carreau-Yasuda model to observe the result differences between rectangular and circular coextrusion channels connected to coat hanger die. Our results showed that rectangular cross-section feedblock generated higher values for pressure in comparison with the pressure generated by the circular cross-section feedblock. The maximum velocity generated in the circular feedblock is lower than that generated in the rectangular one, nevertheless there is more uniformity in velocity distribution in circular than rectangular cross-section.

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An Optimized Design Method and Experimental Study of Belt-Type Ultra-High-Pressure Dies

Shi,

Wang,

2023

Metals

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In this study, various structures are designed to improve the bearing capacity of belt-type ultra-high-pressure dies. Via theoretical analysis, numerical simulation, and destructive experiments, the stress distribution, bearing capacity, and failure principle of various dies are analyzed. The results demonstrate that the positive and negative values of the third invariant of the deviatoric stress tensor J3′ determine the deformation mode of the cylinder; when J3′ > 0, the cylinder is in the tensile deformation state, and when J3′ < 0, the cylinder is in the compressive deformation state. The third invariant of the deviatoric stress tensor of the belt-type cylinder is J3′ > 0, which causes tensile failure and rupture due to excessive circumferential stress. The use of a split cylinder can significantly reduce the circumferential stress, thus effectively reducing the maximum shear stress and von Mises stress and improving the pressure capacity of the cavity. However, when J3′ > 0 for the split cylinder, the pressure capacity is affected and the cylinder experiences tensile failure. A tangential split cylinder has a compressive deformation of J3′ < 0, which can fully utilize the properties of hard alloy materials and significantly improve the pressure-bearing capacity of the cylinder. This article provides an effective optimization design theory for belt-type dies, and the effectiveness of this method is proven through experiments.

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Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

Cited by 3 publications

References 44 publications

Compliance Prediction for Structural Topology Optimization on the Basis of Moment Invariants and a Generalized Regression Neural Network

Compliance Prediction for Structural Topology Optimization on the Basis of Moment Invariants and a Generalized Regression Neural Network

Investigation of Co-Extrusion Using a Coat Hanger Die with Different Feedblock Cross-Section

An Optimized Design Method and Experimental Study of Belt-Type Ultra-High-Pressure Dies

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