barcode reading in c#.net COMPONENT-TO-PWB RELIABILITY in Software

Drawer QR Code JIS X 0510 in Software COMPONENT-TO-PWB RELIABILITY

COMPONENT-TO-PWB RELIABILITY
QR Code Decoder In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Quick Response Code Encoder In None
Using Barcode generator for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications.
FINITE ELEMENT ANALYSIS (FEA)
Decode QR Code In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
QR Code Generator In Visual C#.NET
Using Barcode creator for .NET Control to generate, create QR-Code image in .NET framework applications.
FEA is a numerical technique used to solve complex boundary value problems. It involves discretizing a complex geometry into smaller simpler geometries that can be represented by a set of differential equations. These equations can then be solved numerically to determine the deformation of the overall structure subjected to structural, thermal, or other loading conditions. FEA is a powerful numerical tool that has been used to assess the reliability of solder joints. FEA can be employed to:
Encoding Quick Response Code In .NET Framework
Using Barcode creator for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
Generate QR Code ISO/IEC18004 In VS .NET
Using Barcode maker for .NET Control to generate, create QR Code image in VS .NET applications.
Estimate the fatigue life of a new package Compare reliabilities of different packaging options Assess impact on reliability due to material and design changes to the package Assess impact on reliability due to PWB material and design changes Determine changes in warpage due to package density and location
Denso QR Bar Code Encoder In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create Quick Response Code image in .NET framework applications.
Draw EAN / UCC - 14 In None
Using Barcode encoder for Software Control to generate, create UCC-128 image in Software applications.
FEA has been used effectively in simulating thermomechanical, bending, and shock conditions. This section focuses on the use of FEA to determine the lifetime of packages subjected to thermomechanical strains, and the use of bend test simulations to determine the factors that influence the bend strength of a package. 59.4.1 FEA for Thermomechanical Lifetime Assessment FEA lifetime assessments are typically broken down into four phases:
USS Code 128 Encoder In None
Using Barcode creation for Software Control to generate, create Code128 image in Software applications.
Create Barcode In None
Using Barcode generation for Software Control to generate, create barcode image in Software applications.
Phase 1: global model Phase 2: local model Phase 3: single-joint lifetime assessment Phase 4: statistics-based package reliability estimate Figure 59.15 shows the interrelationships between these four phases.
Printing Data Matrix 2d Barcode In None
Using Barcode generation for Software Control to generate, create DataMatrix image in Software applications.
EAN-13 Supplement 5 Encoder In None
Using Barcode drawer for Software Control to generate, create UPC - 13 image in Software applications.
59.4.1.1 Phase 1: Global Model. Phase 1 involves building a global geometric model of the package. Models in FEA can be two-dimensional, 2.5-dimensional (strip), or three-dimensional. Two-dimensional models (plane strain or plane stress) are computationally very efficient as only a two-dimensional cross section of the assembled package is modeled. However, they are based on the assumption that the out-of-plane deformation and stresses in the assembly are negligible, which is not the case with discrete solder joints. Thus, although they are useful for providing qualitative deformation and stress comparisons, they are not useful for quantitative fatigue-life estimates. A 2.5-dimensional or strip model has a thickness, but it is very small just enough to capture the round shape of the solder joints.While it is an improvement over a two-dimensional model, it does not capture the increased stress concentration at package corners. A three-dimensional model is a much closer representation of an assembled package. Although it is computationally challenging, it is the best way to estimate the deformation and stresses induced in an assembled package. A global model of one-eighth of a BGA package can be found in Figs. 59.16. Note that only one-eighth of the package is modeled (Fig. 59.16).This is due to the fact that the package is octant symmetric, and thus symmetry boundary conditions can be employed to reduce the model size, which in turn increases the speed at which a solution can be obtained.46 Wherever possible, the deformation results of the global FEA model should be verified with experimental warpage measurement (using tools like Shadow Moir 45). A unit temperature rise is applied to the global model, the worst-case joint is determined, and the displacements of the worst-case joints are calculated. Worst-case joint determination
Make EAN / UCC - 8 In None
Using Barcode creator for Software Control to generate, create UPC - 8 image in Software applications.
Barcode Drawer In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create bar code image in ASP.NET applications.
PRINTED CIRCUITS HANDBOOK
Encode Data Matrix In None
Using Barcode encoder for Office Excel Control to generate, create DataMatrix image in Office Excel applications.
GS1-128 Drawer In Objective-C
Using Barcode drawer for iPad Control to generate, create EAN 128 image in iPad applications.
Phase 1 Global Model Mold Compound
ANSI/AIM Code 39 Maker In Visual Basic .NET
Using Barcode creation for .NET framework Control to generate, create Code 39 image in Visual Studio .NET applications.
Paint Matrix 2D Barcode In Visual Basic .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Matrix Barcode image in .NET applications.
Die Attach 2nd Level Interconnect
GS1 - 13 Decoder In Visual C#
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
Barcode Scanner In VS .NET
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
Silicon Module Substrate
Identify worst case joint and develop zoomed-in model.
Apply thermal cycling loads on local model. Analyze joint and determine its fatigue life using a damage parameter. Phase 3 Single Joint Lifetime Assessment Based on probability of individual joint failure, determine the reliability of the entire package. Phase 4 Statistics-based Package Reliability Estimate
Phase 2 Local Model
FIGURE 59.15 FEA flowchart. Phase 1 involves creating the global model to determine global strains and displacements across the entire package. The global model also helps identify the locations of maximum stress. Phase 2 entails zooming into the location with the maximum strain. The boundary conditions applied around the local model are extracted from the global model. Phase 3 involves applying thermal cycling loads on the local model and determining the fatigue life of the worst-case solder joint in the local model. Phase 4 entails the use of statistical assessment tools to determine the reliability of the other solder joints relative to the worst case and thus estimating the solder joint reliability of the entire package.
is typically based on a maximum stress or strain in the solder joints. It is essential to obtain the displacements of the worst-case joint because those displacements can now be incorporated in a local model that will simulate multiple thermal cycles on a worst-case joint. Only a unit temperature rise is applied to the global model to reduce the computational run time. An additional assumption employed in global models to reduce run time is that all materials are linear-elastic and temperature-independent. Because the goal of the global model is to determine the worst-case joint and the corresponding displacement, this approach is typically valid. Reference 46 contains a series of experimental cases and corresponding FEA predictions that validate the global/local approach and the linear elastic, temperatureindependent unit temperature rise technique for the packages studied. 59.4.1.2 Phase 2: Local Model. A local model of the worst-case joint is created and subjected to simultaneous temperature cycle and temperature-scaled displacement-loading conditions obtained from the global model. The displacement field of the worst-case joint obtained
Copyright © OnBarcode.com . All rights reserved.