4 What is Sherlock Sherlock is a CAE knowledge based program for Physics of Failure reliability and durability analysis on electronic equipment Sherlock simplifies model creation and analysis Eliminates the long, complicated, model creation process and the need for a PhD level expert in PoF, and FEA. The “Knowledge Based” features optimized for electronic components and materials includes customizable, preloaded libraries of: Component models, material properties, analysis wizards and environmental profiles for specific applications. Designed to be used to quickly create and perform PoF based reliability/durability simulations.
5 Sherlock Process 1.Design Capture - provides the detailed inputs to the modeling software and calculation tools 2.Life-Cycle Characterization - define the reliability/durability objectives and expected environmental & usage conditions (Field or Test) under which the device is required to operate 3.Load Transformation - translates and distributes the environmental and operational loads across a circuit board to the individual parts 4.PoF Durability/Reliability Analysis & Risk Assessment - calculates life expectations, reliability distributions & prioritizes risks by applying PoF algorithms to the virtual PCBA model created in steps 1, 2 & 3
7 Design Capture o Import PCBA Layout, o Gerber, ODB++, and other CAD formats. o Import BOM Parts List o Correlated supplier component part # and industry/JEDEC package styles to auto link component to Sherlock’s libraries of component geometry and material properties to the individual parts locations mounted on the PCB to create the computer models for the life assessment. o Define PCB Laminate & Layers to Calculate Substrate Performance o Automated Abaqus model generation
Design Capture Component locations from pick and place data
Design Capture Drill holes
11 Design Capture Laminate Library Defines 48 Categories Of Material Properties And Characteristics For 319 Circuit Board Laminates Materials From 20 Global Producers. New Entries Can Be Added When New Laminate Materials Are Introduced to the Market.
Design Capture Stackup information
Boundary Conditions Sherlock has predefined boundary conditions that are typically used for printed circuit boards
Life Cycle Reliability Goals Phases Stresses
Loading Multi-Axis shock and vibration Static Force Displacements Modal Dynamic Harmonic Random Transient Dynamic Mechanical Shock
16 Multi-Axis Shock and Vibration Loads User can specify load direction and/or PCB orientation User can specify uni-axial or tri-axial harmonic profilesLoading
17 Abaqus Integration Mode 1: Sherlock manages all FEA processing Mode 2: Export model from Sherlock to Abaqus Mode 3: Import Abaqus FEA results into Sherlock for reliability analysis Electronic Design Files Life Cycle Conditions 3D Model / Analysis Steps Pre-Processing Reliability Results 3D Model / Disp Results / Strain Result s Post-Processing Parts Packages Materials FEA Tool Abaqus ModelResults FEA Script Sherlock Design Analysis Sherlock Failure Analysis Sherlock Data Store
Transparent to the user Sherlock forms the input deck for Abaqus and runs the simulation with the Abaqus solver Sherlock automatically post processes the results and generates the reliability metrics Mode 1
Sherlock generated results Static displacement Mode 1
Sherlock generated results Random Vibration fatigue Mode 1
Mode 2 Automatic Python script generated models for Abaqus CAE Geometric based All material properties assigned Contact interactions formed Boundary conditions Analysis steps Results need to be imported into Sherlock for reliability assessment
Mode 3 Model generated by Sherlock and modified and run in Abaqus CAE Mechanical parts added, mesh changed, etc..
Power supply model, potting added and assessment of lead stresses using Abaqus
PCB Layer Modeling Sherlock contains FEA tools to speed Abaqus model development Two general techniques Geometric layer modeling Sherlock generates a Python script which converts the PCB plot layers into geometry Mosaic technique Sherlock generates an input deck with material properties assigned to the mesh
Script Based Material properties assigned to copper and resin areas Best suited for generating detailed package models for investigating package CTE issues with Abaqus
Mosaic Orphan mesh Material properties computed for each element based on amount of copper and resin within the element
Mosaic Multiple techniques available for PCB models
Sherlock leverages the power of Abaqus to greatly speed up the mechanical and the reliability analysis of electronic assemblies Multiple levels of interaction Provides additional tools to develop detailed models Models can be generated in minutes verses days Material properties and interactions assigned