PSI - Issue 18

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Alexandru Falk et al. / Procedia Structural Integrity 18 (2019) 214–222 Author name / Structural Integr ty P o edi 00 (2019) 000– 00

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Fig. 2 Reference square subset before deformation and subset after deformation.

Nomenclature DIC

Digital image correlation

PCB Printed circuit board BGA Ball grid arrays

2. Experimental set-up investigations 2.1. Material and specimen setup

A PCB is a multilayer assembly - there are alternating layers of different materials, which are laminated together with heat and adhesive such that the result is a single object. The double-sided PCB (Fig.3) is made of epoxy glass (FR4) with copper foil on both sides of the epoxy glass. The FR4 material is fiberglass and gives the board its rigidity. To create multilayered PCBs combinations of the pre-made material are pressed together with other layers or non copper clad FR4 (Prepreg) used to isolate the copper layers from each other.

Fig. 3 Double sided PCB example.

PCB is assembled between housing and cover as shown in Fig.4.

Fig. 4 PCB assembly.