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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	The effect of porosity on strain evolution and failure of soldered, small-diameter, thin-walled metallic pipes Sophie A. M. Mcnair , Jiraphant Srisuriyachot , Samuel Omole , Thomas Connolley , Andrew Rhead , Alexander J. G. Lunt Journal Of Materials Research And Technology 9 DOI: 10.1016/j.jmrt.2022.12.088 Diamond Proposal Number(s): [28603] Open Access Show Abstract ▼ Abstract: Small-diameter, thin-walled pipes have applications in a wide range of industries including high-energy physics, heat transfer, nuclear, medical and communications. There are no standards that exist for welds less than 0.5 mm in width, and as such it is difficult to determine the likely performance of a thin-walled pipe weld. Porosity is largely inevitable in fusion welded joints and is a determining factor in the performance of a connection. This study focused on characterisation of the evolution of strains in soldered welds less than 0.5 mm in width, by incrementally tensile loading samples and studying them in-situ with Synchrotron X-Ray Computed Tomography and X-Ray Diffraction. Two sample geometries were studied, and porosity defects were present in both, although the levels of porosity size, number and area varied dramatically between the two samples. Lattice strain interpretation showed that crack propagation for such samples is not driven by porosity but that crack evolution occurs at the same location and load levels irrespective of the presence of pores. Residual stresses of up to 0.3% from the fusion welding process were seen in both samples and appear to have a greater impact on locations of failure than porosity. Porosity does cause differences in strains across directions, however high strains alone did not appear to cause premature failure. Hence, efforts to improve weld strength should in future focus more on reducing residual stresses than reducing porosity.	Dec 2022
B16-Test Beamline	Multi-scale structural and mechanical characterisation in bioinspired polyurethane-based pancreatic cancer model Jingyi Mo , Nathanael Leung , Priyanka Gupta , Bin Zhu , Hui Xing , Jiao Zhang , Eirini Velliou , Tan Sui Journal Of Materials Research And Technology 68 DOI: 10.1016/j.jmrt.2021.09.041 Diamond Proposal Number(s): [20046] Open Access Show Abstract ▼ Abstract: In this work, novel bioinspired polyurethane (PU) scaffolds were fabricated via freeze casting for PU-based Pancreatic Ductal Adenocarcinoma (PDAC) model. In order to reproduce the tumour micro-environment that facilitates cellular kinetics, the PU scaffolds were surface modified with extracellular matrix (ECM) proteins including collagen and fibronectin (Col and FN). Synchrotron-based small- and wide-angle X-ray scattering (SAXS/WAXS) techniques were applied to probe structural evolution during in situ mechanical testing. Strains at macroscopic, nano-, and lattice scales were obtained to investigate the effects of ECM proteins and pancreatic cell activities to PU scaffolds. Significant mechanical strengthening across length scales of PU scaffolds was observed in specimens surface modified by FN. A model of stiffness modulation via enhanced interlamellar recruitment is proposed to explain the multi-scale strengthening mechanisms. Understanding multi-scale deformation mechanisms of a series of PU scaffolds opens an opportunity in developing a novel pancreatic cancer model for studying cancer evolution and predicting outcomes of drug/treatments.	Sep 2021

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