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1、1 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential 电子产品可靠性仿真（下） Release 17 2 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Analyzing Printed Circuit Boards (PCBs) and Packages Galileo Board 3456 Bodies How to prepare the board for analysis? Traditional Approach Export step file from the board lay
2、out. The exported bodies are overlapping. Import into Design Modeler / Space Claim Perform Boolean operation and share topology Import Geometry into Mechanical Mesh Specify boundary conditions Solve 3 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Analyzing Printed Circuit Boards (PCBs) and Packag
3、es Galileo Board 3456 Bodies How to prepare the board for analysis? Traditional Approach Export step file from the board layout. 30 mins Import into Design Modeler / Space Claim 10 mins Perform Boolean operation and share topology 24hrs and still running Import Geometry into Mechanical Mesh Specify
4、boundary conditions Solve Traditional approach does not work 4 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Trace mapping provides a fast and efficient method to model such PCBs without incurring the inordinate cost of processing geometry and mesh. Geometry is modeled by just the dielectric laye
5、rs. Very simple geometry which can be easily generated and meshed. Effect of traces is modeled by checking for the presence of Metal Trace in each element, and assigning a new material with material properties calculated based on Metal fraction. What is Trace Mapping? 5 2015 ANSYS, Inc.March 22, 201
6、6ANSYS Confidential Trace Mapping Layout Simplified Geometry and Mesh Layout representation as Metal Map Metal map on Target Mesh 6 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential SpaceClaim now has the ability to import ECAD files. Can import: Layout Geometry Layer Topology Supported File Formats:
7、 Cadence SPB (*.brd;*.mcm;*.sip) ANSYS Electronics Database (*.def) Other ECAD (*.tgz;*.xml;*.cvg;*.gds;*.sf;*.strm) Creating Simplified Geometry ECAD Import in Space Claim 7 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential ECAD Files can be imported into SpaceClaim using File - Open ECAD Import in
8、Space Claim 11 layers Each layer as a separate body Shared Topology Details show Material Assignment for each layer 8 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential The PCB 3D layout files can be specified in the External Data Transfer link from External Data Setup to Model cell in Mechanical syst
9、em transfers the layout data to Mechanical Following formats are supported: Ansoft ANF Cadence BRD/MCM/SIP ODB+ TGZ ICEPAK BOOL+INFO ICEPAK COND+INFO For each file user can specify: Rigid transforms to align the board outline with geometry. Importing Trace Data in Mechanical 9 2015 ANSYS, Inc.March
10、22, 2016ANSYS Confidential The refresh operation on Model cell automatically inserts Imported Trace folder in the Tree. It automatically adds an Imported Trace object under the Imported Trace folder Additional Imported Trace objects can be added by right click on Imported Trace folder and choosing I
11、nsert-Trace The details view of the Imported Trace object allows user to specify Trace Import definition. Scoping: to specify the bodies representing the layer geometry for the PCB. External Data Identifier: drop-down list of available ECAD files from the list of files specified in the External Data
12、 system. Importing Trace Data in Mechanical (contd.) 10 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential The Data View allows the user to see (and modify) the layers specified in the PCB layout. The following information is available. Layer Names Layer Thicknesses Trace material Activation / Deactiv
13、ation of layers. Trace material is defined in the Engineering Data module Two sample materials have been added in General Materials library Copper Alloy (Metal) FR-4 (Dielectric) The dielectric material is assigned using Material field in body details Importing Trace Data in Mechanical (contd.) 11 2
14、015 ANSYS, Inc.March 22, 2016ANSYS Confidential Once fully defined, the Import operation imports the Trace data and maps onto the Target mesh. Graphics Controls allow user to visualize the mapped data Additional Controls: Material-Modeling option allow user to control how material properties are cal
15、culated based on Metal Fraction. X/Y-Discretization to you specify the grid density count to create the trace metal distribution of the board Importing Trace Data in Mechanical (contd.) 2 2 12 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Displacement Displacement 2 Uniform Temperature 50C Bounda
16、ry Conditions 13 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Results X DeformationY Deformation 14 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential Results Z Deformation Z Deformation (Full Fidelity) Good agreement between Full Fidelity and Trace Mapping analysis 15 2015 ANSYS, Inc.March 22, 2016ANSYS Confidential More Results Equivalent Stress Equivalent Strain 16 2015 ANSYS, Inc.March 22, 20
