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An analytical approach to bga components in random vibration environments

An analytical approach to bga components in random vibration environments. Milan J Lucic, MANE 6980 Engineering Project. Methodology and Approach. Accurately model the ACTEL 484 PBGA with 3-D hex elements (balls and solder joint), and 2-D Shell elements (PCB and component body)

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An analytical approach to bga components in random vibration environments

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  1. An analytical approach to bga components in random vibration environments Milan J Lucic, MANE 6980 Engineering Project

  2. Methodology and Approach • Accurately model the ACTEL 484 PBGA with 3-D hex elements (balls and solder joint), and 2-D Shell elements (PCB and component body) • Using NX7.5 Advanced simulation for Pre-Processing and MSC PATRAN/MD NASTRAN as the post processor and solver • PATRAN Random utility to solve for frequency response (Mode Shapes), displacements, and RMS stresses • PATRAN static inertial analysis to solve for stresses of BGA’s • Greatly reduce analysis time! • Using hand calculations, solve for the Miner’s Damage Index of electrical components and the high cycle fatigue of the BGA components.

  3. Expected Outcomes • To develop a better understanding of lead vs. lead free BGA components used in common Aerospace environments • Correlate data with actual industry test data to refine future models • Greatly reduce risks early in the design phase • Eliminate the need for development testing of BGA components (expensive and time consuming) • Generate plots of high cycle fatigue life for lead vs. lead-free BGA components

  4. Project Progress-FEA Model Pin Grid Snapshot BGA Model ACTEL 484 PGA Solder Ball and Solder Joint FEM

  5. Project Progress-FEA Model Boundary Conditions:

  6. Finite Element Analysis-Hand Calcs Plate Stiffness Factor First Mode Natural Frequency GRMS Single Amplitude Displacement Curve C Calculated Results: fn = 266.4 Hz ZRMS = .0018 inches

  7. Finite Element Analysis-Normal Modes Mode 1: 266.59 Hz Mode 2: 341.07 Hz Mode 3: 511.18 Hz

  8. Finite Element Analysis-Random Mode 1 Mode 3 Mode 2 Input Curve Frequency Response RMS Displacement

  9. Finite Element Analysis-Optimization Optimized Size: 570 Elements (Quad 20)

  10. Project Schedule • Week 1: Develop Project Definition • Week 2: Preliminary Project Proposal • Week 3: Project Proposal • Week 4: FEA Model Development/Research • Week 5: Random Analysis/Model Refinement • Week 6: Random Analysis/Model Optimization • Week 7: Random Analysis/Model Optimization, First Progress Report • Week 8: MDI Calculations/Random Analysis • Week 9: Inertial Analysis • Week 10: Post Processing, Second Progress Report • Week 11: Post Processing (extra time for model refinement) • Week 12: Final Report Draft • Week 13: Final Report Draft • Week 14: Final Report

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