Mechanics of Additive and Advanced Manufacturing, Volume 8 by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783319950839
Publisher: Springer International Publishing

10.2.2.2 Phase-Contrast Imaging Techniques at Advanced Photon Source

Shock compression of AM polymer foams combined with real-time phase contrast imaging (PCI) and photon Doppler velocimetry (PDV) were examined by impact experiments conducted at the Dynamic Compression Sector (DCS) using the IMPact system for the ULtrafast Synchrotron Experiments (IMPULSE). This unique capability at the Advanced Photon Source (APS) allowed a more detailed understanding of the wave dynamics as a result of porosity. The foam (2 mm × 6 mm × 6 mm) was epoxied (Angstrom Bond) to a PMMA window (3 mm × 6 mm × 6 mm) with a 0.8 μm Al mirror deposited on the foam/PMMA interface. A 1.0 mm thick Cu (OFHC-Cu) impact plate was affixed to the opposing surface of the micro-lattice sample to act as a drive plate and the assembly was secured to a target holder. Polycarbonate projectiles faced with Cu impactors were accelerated at 0.303 km/s using a single stage powder gun resulting in a pressure of 0.98 GPa [10]. Figure 10.6 shows a schematic of the experimental configuration for transmission PCI with the gun oriented perpendicular to a series of 80-ps width X-ray bunches (E = 25 ± 0.9 keV, λ = 0.5386 Å) spaced 153.4 ns apart transmitted through the AM polymer foam (inset) and detected using a LuAg:Ce (Lu3Al5O12:Ce) scintillator optically coupled to four independent image intensified charge coupled device (ICCD) detectors (Princeton Instruments) to provide 4 to 8 X-ray images per experiment [11–13].

Fig. 10.6Schematic of the experimental configuration for transmission PCI. The gun is oriented perpendicular to a series of 80-ps width X-ray bunches (E = 25 ± 0.9 keV, λ = 0.5386 Å) spaced 153.4 ns apart transmitted through the AM polymer foam (inset) and detected using a LuAg:Ce (Lu3Al5O12:Ce) scintillator optically coupled to four independent image intensified charge coupled device (ICCD) detectors (Princeton Instruments) to provide 4 to 8 X-ray images per experiment

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