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Of course, you might think that XML is just as difficult to maintain as machine-generated Java code; and this is where JDeveloper exploits the full power of Oracle ADF. JDeveloper allows the manipulation of the metadata in a much more intuitive and simplified way. In the case of page navigation, the developer is presented with a page flow visual editor that shows the pages of the applications and how they flow together. As a developer, you are working with a visual representation that closely matches the job at hand. The fact that changing the visual page flow is actually changing an XML file is, generally speaking, something you don t see or need to see. NOTe While JDeveloper presents the editing of the framework metadata through visual diagrams, dialog boxes, and property inspectors, there is nothing to stop you from directly editing the source files as well. Whether you re editing the XML file directly or through one of the more declarative means, the same underlying file is being updated.

Susceptibility to mechanical failures is closely linked to design of the PCA and the housing in which it is installed The design determines the resonant frequency of the board, which in turn determines its response to external mechanical stresses Cantilevers with low natural frequencies, such as an edge-mounted PCB with an unanchored large mass in the center, are particularly prone to failure Depending on connector design and mounting scheme, solder joints to surface-mount connectors can also be vulnerable, particularly if there are many connector insertion cycles See Ref 20 for a more detailed discussion of design methodologies for mechanical durability Overload and Shock Failures of Solder Joints When a printed circuit assembly is flexed, jolted, or otherwise stressed, solder joint failures may occur.

(continued)

In general, solder is the weakest material in the assembly; however, when it connects a compliant structure such as a leaded component to the board, the lead flexes and the solder joint is not placed under much stress Solder joints to leadless components will see large stresses since the board can bend and the components themselves are usually rigid These stresses can occur if the assembly is mechanically shocked, for example, if the unit is dropped, or during further assembly processes if the PCB is bent through a significant radius The primary method of eliminating this failure mode is through package selection; however, other factors also play a role, including PCB design, process control during printed circuit board fabrication and assembly, and the shear strength, tensile strength, and ductility of the solder Solder joints are particularly prone to failure in.

Board Material The PWB material, or more precisely the PWB material thermal conductivity, has a direct impact on the temperature rise of a trace. The differences between the FR-4 material and

polyimide material thermal conductivity, shown in Table 16.3, have approximately a 2 percent impact on trace temperature rise. The thermal conductivity reported in most data sheets is the z-axis thermal conductivity, which represents the resin in the material. The x- and y-axes are higher due to the woven fibers in the laminate. There is not much information provided on the thermal conductivity of

TABLE 16.3 Material Thermal Conductivity Material FR-4 Polyimide Copper OFHC Air Kx w/in.-C (w/m-K) 0.0124 (0.488) 0.0138 (0.543) 9.935 (391.2) 0.000879 (0.0346) Ky w/in.-C (w/m-K) 0.0124(0.488) 0.0138 (0.543) 9.935 (391.2) 0.000879 (0.0346) Kz w/in.-C (w/m-K) 0.0076 (0.299) 0.0085 (0.335) 9.935 (391.2) 0.000879 (0.0346)

laminate materials, and the values listed in Table 16.3 for FR-4 and polyimide are measured values from current carrying capacity test board coupons. The thermal conductivity of copper is almost 1,000 times greater than the dielectric material and is the reason that internal copper planes have such a significant effect on trace temperature rise. The thermal conductivity of air, which is 10 times less than the dielectric, helps explain why external traces generally run hotter than internal traces. 16.5.6 Environments The term environment refers to the surroundings to which the circuit board is exposed and in which it operates. The circuit board may be mounted in an electronics box in a vacuum or surrounded by still air. The board and electronics may be exposed to forced air or it could be immersed in an inert fluid. It may be necessary to estimate the impact of one environmental condition over another; therefore, it is important to know that the baseline configuration is for a still air environment. One environment that is not more conservative than still air is an environment in vacuum or in space (see Fig. 16.13). In a vacuum, the internal and external traces run approximately at the same temperature. The internal IPC chart is recommended for sizing traces