PSI - Issue 56

Alexandru Isaincu et al. / Procedia Structural Integrity 56 (2024) 167–175 Alexandru Isaincu / Structural Integrity Procedia 00 (2019) 000 – 000

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universal testing machine, Zwick Roell Z005, was used. The speed of the testing equipment was set to 5 mm/min. The distance in between the jaw grips was kept around 50 mm. The test setup is presented in Fig. 3 a).

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PPA_GF33 3.2mm 90° PPA_GF33 3.2mm 45° PPA_GF33 3.2mm 0°

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Displacement [mm]

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Fig. 3. Test setup of SEC specimen a) and typical force-displacement curves b).

Two materials (PPA GF33 and PPS GF40), with two thicknesses (2.0 mm and 3.2 mm) and three orientations (0°, 45° and 90°) were considered. For each case, a set of 5 specimens were investigated. In the end, a set of 60 specimens were tested. 3. Experimental results and analytical interpretation The main parameter that was measured during testing was the breaking force. For both materials and both thicknesses, the failure is brittle. This aspect can also be noticed in Fig. 5 b). In the beginning of the test, there is a slight slippage until the force increases and the jaws grip the probe more firmly. After that point, a linear behavior can be seen until failure. This is similar for both materials. An overview of all breaking forces is presented in Fig. 4.

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PPA_GF33 Test Forces 2.0mm PPA_GF33 Test Forces 3.2mm PPS_GF40 Test Forces 2.0mm PPS_GF40 Test Forces 3.2mm

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-15°

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Orientation (fiber orientation vs. crack) [ ° ]

Fig. 4. Breaking force for PPA GF33 and PPS GF40 function of material thickness.