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Resin Molding and Rheology, Lesson 12: "Fundamentals of Bubble Growth"

Resin Molding and Rheology, Lesson 12: "Fundamentals of Bubble Growth"

Explanation of the basic equations for bubble growth analysis and a simple calculation example! Includes diagrams of bubble models and states of expansion.

One of the fields of plastic molding processing is foamed molding. This involves growing bubbles in molten resin to impart shock absorption, cushioning, thermal insulation, sound absorption, and soundproofing properties to the molded products, while also aiming for weight reduction. In this column, we will introduce the basic equations for bubble growth analysis and a simple calculation example. [Contents] ■ Derivation of basic equations ■ Simple calculation example *For more details on the column, please refer to the related links. Feel free to contact us for more information.

  • Other analyses

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[Technical Column] ~Using CAD Data for FE Modeling~

[Technical Column] ~Using CAD Data for FE Modeling~

There are three main types of CAD data handled in CAE analysis! Technical information useful for CAE practice explained in a Q&A format.

There are various types of CAD, including architectural CAD used for building drawings and landscape design, electrical CAD for electronic circuit design, and 3D CAD used in the design and development of industrial products. In this column, we will explain cases where 3D CAD data of product shapes is utilized in analysis. We address questions such as, "I want to use CAD data for finite element analysis modeling; what methods are available?" For more details, please refer to the related links. We encourage you to read it. [Contents] ■ Question ■ Answer ■ Three types of CAD data used in analysis ■ IGES and STEP are public standards ■ Parasolid and ACIS are private standards ■ Other considerations besides file formats *For detailed content of the column, you can view it from the related links. Please feel free to contact us for more information.

  • Other analyses

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[Heat-Fluid-Structure Coupling Example] Hot Forming Considering Cooling Water Flow

[Heat-Fluid-Structure Coupling Example] Hot Forming Considering Cooling Water Flow

The solver uses the high-precision version R10.1.0 of MPPDYNA! Water absorbs the heat from the mold, causing the temperature to rise.

We will introduce a case where "cooling of metal tubes" is applied and analyzed as a coupled problem of heat, fluid, and structure. A high-temperature blank is processed by drawing with a mold at room temperature, and water is flowed through the cooling tube to cool the mold. The solver used is the R10.1.0 high-precision version of MPPDYNA, and parallel calculations are performed on 16 CPUs. As a result, the mold contacts the blank, causing the temperature at the contact point to rise, which is then cooled by water. Additionally, the water absorbs heat from the mold, causing its temperature to rise. [Contents of the Analysis Model] ■ Blank: The sheet material being processed ■ Mold 1_Die: Strokes downward to draw the blank ■ Mold 2_Punch: Remains stationary to draw the blank ■ Mold 3_Holder: Applies upward load to suppress wrinkles at the edge of the blank ■ Mold 4_Pad: Applies downward load to suppress wrinkles at the head of the punch *For more details, please refer to the related links or feel free to contact us.

  • Structural Analysis

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[Fluid-Structure Coupling Example] Verification of R11 S-ALE Mesh Trim Function

[Fluid-Structure Coupling Example] Verification of R11 S-ALE Mesh Trim Function

It is expected that the calculation time can be significantly reduced without greatly affecting the results!

In the analysis model of Case 2 for the "Water-filled Bottle Drop Analysis using ALE and S-ALE," we will introduce a case that utilized the mesh trimming function. In version R11.0.0, the computation time has decreased by approximately 10% compared to R10.1.0, and by using the mesh trimming function, it has further decreased by about 35%. It is expected that the computation time can be significantly reduced without having a major impact on the results. 【Analysis Results】 ■ In R11.0.0, the computation time has decreased by approximately 10% compared to R10.1.0, and by using the mesh trimming function, it has further decreased by about 35%. ■ There are no significant differences in behavior or leakage amounts due to version differences or the use of the trimming function. *For more details, please refer to the related links or feel free to contact us.

  • Structural Analysis

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[Shape Optimization Example] Optimization of Reinforcement Rib Shape for Automotive Parts

[Shape Optimization Example] Optimization of Reinforcement Rib Shape for Automotive Parts

It is possible to easily parameterize shape changes! The height of the reinforcing rib is prepared using a model in its initial state.

We will introduce a case of shape optimization for reinforcement ribs using "LS-DYNA" and the optimization support tool "Altair HyperStudy." The height of the reinforcement ribs was optimized by preparing a model in its initial state and morphing the shape from the lower limit to the upper limit. A model was prepared for the maximum number of ribs (minimum pitch) and then morphed to achieve the minimum number of ribs (maximum pitch). As a result, since GRSM explores globally compared to ARSM, suitable shapes that meet the constraint conditions are obtained even when the plate thickness on the long side of the rib is small. 【Analysis Model】 ■ Shell elements (mesh size 10mm) ■ Elastic material ・ Young's modulus: 2000MPa ・ Density: 1.1×10^-9 ton/mm³ ・ Poisson's ratio: 0.35 *For more details, please refer to the related links or feel free to contact us.

  • Structural Analysis

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