📋 Case Study

Limestone Mine Vibrating Screen Frame Cracking Mitigation

Recurring weld cracks at screen side plate-to-crossbeam junction under variable limestone gradation (15–75 mm)

🏗️ Project Overview

High-capacity quarry in Missouri, USA

🎯 Challenge

Recurring weld cracks at screen side plate-to-crossbeam junction under variable limestone gradation (15–75 mm)

🔧 Design Approach

Fatigue life simulation (FEA) → redesigned gusset geometry → stress-relieved weld procedure qualification → strain gauge validation

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Stress Concentration Factor (Kt)

σ_max / σ_nom

Result: 2.8 → 1.4 post-redesign

Reduced local stress by 50%

Fatigue Life (n)

C × (Δσ)^−m

Result: 2.1M cycles → 11.6M cycles

Extended service life from 8 to 44 months

📊 Results

No structural cracks in 32 months; screening efficiency improved from 81% to 94%; reduced recalibration frequency by 70%

💡 Lessons Learned

• •Variable feed size demands dynamic fatigue modeling—not static FEA
• •Strain gauge validation is mandatory before full fleet rollout

✅ Key Takeaways

• 1Variable feed size demands dynamic fatigue modeling—not static FEA
• 2Strain gauge validation is mandatory before full fleet rollout