Stephane Kemgang

🚀 Crash Test Simulation – Chassis vs Concrete Wall (Ansys 2023) I carried out an explicit dynamic simulation to study the behavior of a tubular chassis during a frontal impact against a concrete wall, at an impact speed of 100 m/s (≈ 360 km/h). 🔹 Software: ANSYS 🔹 Analysis type: Explicit dynamics (high-speed impact) 🔹 Scenario: Chassis colliding with a rigid concrete wall (wall modeled as quasi-rigid / reinforced concrete depending on assumptions) ✅ Objectives: Evaluate the distribution of equivalent strains, energy concentration zones, and potential failure points. Assess the chassis’ energy absorption capacity when facing a highly rigid obstacle. Identify possible structural improvements to increase safety and crash resistance. 💡 Practical interest: this type of study helps anticipate failure modes, optimize geometry and joints, and reduce costly physical testing. #Ansys #Simulation #CrashTest #CAE #FEM #Concrete #MechanicalEngineering

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🔩 Advanced GD&T — Composite Position Tolerancing Explained Step by Step In mechanical engineering, Geometric Dimensioning and Tolerancing (GD&T) is not just a language — it’s a tool for precision. Today, let’s understand one of the most powerful yet misunderstood concepts in GD&T — 👉 Composite Position Tolerancing --- 🧠 Step 1: What is Composite Position Tolerancing? Composite position tolerancing is used when you have multiple features (like holes or pins) arranged in a pattern — and you want to control both their location and orientation accurately. It’s represented by a two-segment feature control frame, where: The upper segment controls the pattern location and orientation to the datum reference frame. The lower segment controls the feature-to-feature relationship (spacing and orientation within the pattern). --- ⚙️ Step 2: Understanding the Two Segments 🔹 Upper Segment (Pattern Locator) Controls how the entire pattern is located relative to the datum system. Affects the position of all features together. Includes datums A, B, C, etc. 🔹 Lower Segment (Feature Refiner) Controls how each feature within the pattern is related to each other. It doesn’t reorient or relocate the whole pattern — it only tightens the spacing or parallelism between features. Usually references fewer datums (often just datum A or sometimes none). --- 🧩 Step 3: Why Use Composite Position Tolerancing? It’s useful when: ✅ You have a bolt hole pattern or pin array that must fit into a mating part. ✅ You need high positional accuracy between holes (but some freedom for the entire pattern shift). ✅ You want to reduce assembly issues like misalignment, binding, or uneven load distribution. --- 📏 Step 4: Real-Life Example Imagine a 4-hole pattern on a flange. You apply a composite position tolerance with: Upper segment: Ø0.5 | A | B | C Lower segment: Ø0.1 | A ➡️ Here, The Ø0.5 controls the entire pattern’s position to the datums. The Ø0.1 ensures that the holes are precisely spaced and parallel within the pattern. --- 🛠️ Step 5: Key Benefits Controls location + pattern precision effectively Avoids over-constraining parts Improves assembly fit and repeatability Commonly used in aerospace, automotive, and precision tooling --- 💡 Pro Tip Composite position tolerancing ≠ two single-segment callouts stacked together. It’s a single tolerance applied in two layers of control — working together for both macro (pattern) and micro (feature) accuracy. --- 🎯 Summary Segment Controls Datums Used Purpose Upper Pattern Location & Orientation A, B, C Locates pattern to reference frame Lower Feature-to-Feature Relationship A (or fewer) Refines spacing/orientation #MechanicalEngineering #GDandT #EngineeringDrawing #CompositeTolerancing #DesignForManufacturing #CADMech #MechanicalDesign #PrecisionEngineering

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🚀 CFD Workshop 📍 Mode: Online 🗓️ Date: 13th September 2025 🕢 Time: 7:30 PM (IST) 📢 Organized by: Vedaero 🔬 About the Workshop Dive into the world of Computational Fluid Dynamics (CFD) and learn how to simulate and analyze real-world fluid flow problems using industry-standard tools. This workshop is designed for students, researchers, and professionals eager to strengthen their CFD knowledge. 💡 What You’ll Learn • Fundamentals of CFD and Fluid Mechanics • Introduction to CFD Software (ANSYS Fluent / OpenFOAM / XFOIL) • Pre-processing: Geometry & Meshing • Solving & Simulation Techniques • Post-processing & Result Interpretation • Case Studies in Aerodynamics & Heat Transfer ✅ Who Can Attend • Engineering Students (Aerospace, Mechanical, Civil, Chemical) • Research Scholars & Faculty • Professionals interested in CFD applications 🎁 Benefits • Hands-on Training with Software Tools • Live Project Demonstrations • Certificate of Participation • Internship & Career Guidance Opportunities

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