barcode reading in c#.net PRINTED CIRCUITS HANDBOOK in Software

Generator QR Code JIS X 0510 in Software PRINTED CIRCUITS HANDBOOK

PRINTED CIRCUITS HANDBOOK
Scanning QR Code In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Denso QR Bar Code Generation In None
Using Barcode creator for Software Control to generate, create Quick Response Code image in Software applications.
where
Scan QR-Code In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
Draw QR Code In C#.NET
Using Barcode printer for VS .NET Control to generate, create QR Code 2d barcode image in VS .NET applications.
ep = plastic portion of the cyclic strain Nf = number of cycles to failure k = Boltzmann s constant (eV) f = cyclic frequency Tmax = maximum temperature of the thermal cycle (K) A = an experimentally determined empirical constant
Painting QR-Code In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications.
Print QR Code In .NET Framework
Using Barcode printer for .NET framework Control to generate, create QR image in Visual Studio .NET applications.
59.2.4.2 Acceleration Factors. One of the challenges that must be addressed when attempting to employ Eq. 59.9 directly to assess fatigue life is the determination of the plastic strain and the value of the constant A. It is crucial to remember that the goal of this analysis is to develop an acceleration transform (or acceleration factor) that can be employed to use known fatigue-life data obtained under controlled laboratory conditions to estimate the number of cycles to failure under field conditions. The acceleration factor AF is defined as the ratio of the number of cycles to fail in the field NfF to the number of cycles to fail in the lab NfL (see Eq. 59.10). AF = where NfF NfL (59.10)
QR Code Generator In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create QR Code image in VS .NET applications.
Bar Code Drawer In None
Using Barcode generation for Software Control to generate, create barcode image in Software applications.
AF = acceleration factor NfF = number of cycles to failure in the field NfL = number of cycles to failure in the lab
Make Bar Code In None
Using Barcode creation for Software Control to generate, create barcode image in Software applications.
Print Code 3 Of 9 In None
Using Barcode encoder for Software Control to generate, create Code 39 image in Software applications.
Substituting Eq. 59.9 for lab and field conditions into Eq. 59.10, one obtains 59.11. ( A / pF )1.9 fF1/ 3 exp N AF = fF = NfL 1 ( A / pL)1.9 fL / 3 exp where 0.123 kTmaxF 0.123 kTmaxL
Making USS-128 In None
Using Barcode encoder for Software Control to generate, create GS1-128 image in Software applications.
Drawing ECC200 In None
Using Barcode maker for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
(59.11)
EAN - 14 Generation In None
Using Barcode encoder for Software Control to generate, create UPC Case Code image in Software applications.
UPC Symbol Maker In None
Using Barcode drawer for Excel Control to generate, create UPC A image in Excel applications.
AF = acceleration factor NfF = number of cycles to failure in the field NfL = number of cycles to failure in the lab epF = plastic portion of the cyclic strain in the field epL = plastic portion of the cyclic strain in the lab fF = cyclic frequency fL = cyclic frequency TmaxF = maximum temperature of the thermal cycle in the field (K) TmaxL = maximum temperature of the thermal cycle in the lab (K) k = Boltzmann s constant (eV) L = lab conditions F = field conditions
GTIN - 128 Creator In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create UCC-128 image in BIRT applications.
UCC-128 Recognizer In VB.NET
Using Barcode scanner for VS .NET Control to read, scan read, scan image in .NET applications.
Equation 59.11 can be algebraically rearranged to yield Eq. 59.12. Note that the max subscripts on the maximum temperatures have been dropped to simplify the notation. = pL pF
Reading Barcode In .NET Framework
Using Barcode reader for VS .NET Control to read, scan read, scan image in VS .NET applications.
GS1 - 12 Generation In Java
Using Barcode creator for BIRT Control to generate, create UCC - 12 image in Eclipse BIRT applications.
AF =
EAN 13 Printer In Java
Using Barcode printer for Java Control to generate, create EAN-13 image in Java applications.
Painting Code 128 Code Set C In Java
Using Barcode generation for Java Control to generate, create Code-128 image in Java applications.
N fF N fL
1 fF 1 x exp 1414 TF TL fL
1/ 3
(59.12)
COMPONENT-TO-PWB RELIABILITY
where
AF = acceleration factor epF = plastic portion of the cyclic strain in the field epL = plastic portion of the cyclic strain in the lab fF = cyclic frequency in the field fL = cyclic frequency in the lab TF = maximum temperature of the thermal cycle in the field (K) TL = maximum temperature of the thermal cycle in the lab (K)
When considering package interconnects of the same geometry and material set, one can reduce the strain term ep in Eq. 59.9 to the change in temperature.10 This is a key feature that enables the development of an acceleration transform. The goal of this analysis is to develop a transform that allows one to map laboratory thermal cycle loading conditions to field loading conditions for the same package. Thus it is valid to assume that the strain term can be reduced to the change in temperature, as shown in Eq. 59.13.
P T
where
(59.13)
ep = plastic portion of the cyclic strain T = difference between maximum and minimum temperature of the thermal cycle
Substitution of Eq. 59.12 (including L and F subscripts for lab and field, respectively) yields the final form of the acceleration factor relationship, which can be seen in Eq. 59.14.10 NfF NfL 1 T f 1 = L F exp 1414 x TF TL TF fL
1.9 1/ 3
AF =
(59.14)
where
AF = acceleration factor fF = cyclic frequency in the field fL= cyclic frequency in the lab TF = maximum temperature of the thermal cycle in the field (K) TL = maximum temperature of the thermal cycle in the lab (K) TF = difference between maximum and minimum temperature of the thermal cycle in the field TL = difference between maximum and minimum temperature of the thermal cycle in the lab
Figure 59.7 contains experimental failure data for a ceramic ball grid array (CBGA) cycled under the same two conditions. The predicted acceleration factor was calculated to be 3.2 employing Eq. 59.14. This predicted value correlates quite well with the CBGA data (acceleration factor ranges from 2.9 to 3.6). Note that this approach tends to be overly conservative when mapping large lab T into small field T (in the case of minicycles, to be discussed in a subsequent section). 59.2.4.3 Effect of Lead-Free Conversion. The acceleration factor equation (Eq. 59.14) is specifically derived from experimental data for Pb/Sn solder joints. What remains to be conclusively demonstrated is an equivalent acceleration transform for lead-free solder joints. Several studies have been performed, but there are no acceleration transforms accepted industrywide for lead-free solders. One of the acceleration transforms proposed is discussed in this section. A more comprehensive list of other field life prediction studies can be found in the appendix of IPC-9701-A.3
Copyright © OnBarcode.com . All rights reserved.