Speaker
Description
Recent advances have been made at SINQ, the neutron source of the Paul Scherrer Institute in Villigen, Switzerland, in applying the Frame Overlap Bragg edge Imaging (FOBI) method for non-destructive internal strain measurements [1]. This method employs a multiple slit chopper with a pseudorandom pattern, allowing neutron pulses with different wavelengths to arrive at the detector simultaneously. The overlapping spectra prevent direct conversion to wavelength, so a coded source imaging technique is used to disentangle the overlap be-tween different pulses [1]. This approach compensates for flux reduction by increasing the duty cycle, thereby reducing measurement times. FOBI has been successfully employed at POLDI (Pulse OverLap DIffractometer), the Time-Of-Flight (TOF) diffractometer at SINQ, for texture determination and strain mapping in various metallic alloys produced by additive manufacturing.
In this work, we present the application of strain and texture mapping using the FOBI meth-od at POLDI in multi-material lattice structures produced by laser powder bed fusion. Addi-tionally, we study the internal strain during in-situ lap shear tests on different combinations of dissimilar materials joined by friction stir welding.
| Abstract Topic | Application studies |
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