Structural Analysis of Printed Circuit Board Systems

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A Unique Simulation Software

Audible Download Audio Books. Many companies have created their own test procedures to ensure that all manual handling steps are executed correctly during the assembly as well as developed test scenarios for PCB testing to cover all relevant cases.

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Numerical simulation methods such as FEA are limited in their scope since they are based on mathematical model approaches. Therefore, physical tests on real PCBs are at least additionally required to test the real strain behavior of the board. Other test methods such as CTs and X-rays are not sufficiently adequate to check the influence of the mechanical impact and are, on top of that, expensive methods to employ. Strain values are the only reliable calculations for measuring the mechanical deformation of PCBs.

PCBs are usually small in dimension, and the challenge is to install strain gauges in the limited space available. HBM offers over different strain gauges for special applications, alongside some specialized strain gauges for PCB strain measurement.

Thermo Mechanical Analysis Methods for Printed Circuit Boards Part 3: Vibration Analysis

The RF91 three-grid miniature rosette , for example , is an excellent product to measure strain on miniature components. It is available in different variants. Three-grid rosettes are used for PCB strain measurement applications since the direction of principal strain is unknown. It is only 5mm in diameter and can, therefore, be mounted easily on PCBs.

The tension status on PCBs is mostly unknown and quite mechanically complex. Strain situations result in the deformation of a plate. Plate deformation does not follow the classic models of beam deformation or torsion of a shaft, which are quite accurately described by linear electrostatics. This means that a PCB is quite heterogeneous in its material properties. It is neither useful nor possible with respect to cost and time to check every single section of a PCB according to the strain properties and behavior.

Therefore, measurements on PCBs are set at areas where the risk of failure is estimated to be especially high such as:. Strain gauges can measure mechanical deformations of the printed circuit board. First, the printed circuit board must be prepared for the installation of a strain gauge. This video shows the required steps. This video illustrates how a rosette is glued to a circuit board using the Z70 quick-curing adhesive.

  • 1. Introduction;
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  • Structural analysis of printed circuit board systems /;

Finally, the implementation will be illustrated by means of a printed circuit board using the QuantumX MXB and the catman measurement software. Now, the sensor specifications need to be set. Set the correct parameters by using the k-factor displayed on the datasheet of each HBM strain gauge package.

Enter the excitation voltage, the bridge factor, and the measurement range. Add all three channels in a, b, c and define the material properties and the transverse sensitivity of the gauges. The aim of the analysis is to check if the measured data meets the acceptable criteria for the PCB strain.

The idea is that the maximum principal strain Y-axis should not exceed a certain value. Heartwarming colour illustrations on each of the first 64 pages, with two-colour red and black illustrations for the balance of the book. Unmarked with average wear. Binding sound. Small white patch on back board where sticker removed. We are uncertain of the printing date and printing number so please inquire if you have any questions. A thoroughly delightful vintage item!.

6. How to set up a Strain (Rate) Measurement in catman AP

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