Phân tích tuyến tính và đánh giá hội tụ mô hình ABAQUS/CAE Linear Static Analysis Mesh Convergence

#abaqus #cae #engineeringsimulation #fea #mechanicalengineering Phân tích tuyến tính và đánh giá hội tụ mô hình | Linear Static Analysis Mesh Convergence in Abaqus Trình bày: Ninh Xuân Tuyên - Toogann Technologies In engineering simulation, accuracy is everything. Recently, I worked on a linear static structural analysis using Abaqus, focusing not only on modeling but also on evaluating mesh convergence—a critical step that is often underestimated. Here’s a quick breakdown of the workflow and key insights: 🧩 *1. Pre-processing (Geometry & Partitioning)* The analysis begins with building or importing the CAD model (STEP, IGES, Parasolid). Using the *Partition tool* helps simplify meshing and improves solution accuracy—especially in regions with stress concentrations. ⚙️ *2. Material Definition* For this study, a *steel material* was used with: Young’s Modulus: 210,000 MPa Poisson’s Ratio: 0.3 A homogeneous solid section was assigned to the model. 📌 *3. Boundary Conditions & Loading* Fixed constraint applied at one end (all DOFs constrained). External load: Fx = 5000 N Important note: Always ensure the model is fully constrained to avoid rigid body motion. 📊 *4. Mesh Study & Convergence Analysis* Multiple mesh sizes were tested to evaluate result sensitivity: | Mesh Size (mm) | Max Von Mises Stress (MPa) | | -------------- | ----------------------------- | | 10 | 199.52 | | 7 | 251.63 | | 5 | 342.75 | | 3 | 350.28 | | 2 | 351.29 | | 1 | 352.14 | ✅ As the mesh is refined, the results gradually converge toward 352 MPa ✅ Significant changes occur with coarse meshes, but stabilization begins around 3 mm and below 💡 Key Takeaways Mesh size has a direct impact on stress results, especially in critical regions. A coarse mesh may lead to underestimated stress values Performing a mesh convergence study is essential before trusting simulation results. Balance between accuracy and computational cost is key. 🚀 Simulation is not just about running models—it’s about **understanding the reliability of your results**. Have you conducted mesh convergence studies in your simulations? What criteria do you typically use?