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Summary: In Wireless Sensor Networks (WSN), energy‐efficient, reliable routing is the core objective for the data transmission process. Anomaly nodes in the communication environment can affect reliable routing and network efficiency. Therefore, the present research created a novel Arithmetic Optimization‐based Rumor Routing Protocol with SKINNY Crypto mechanism (AORRP‐SCrypt) for secure Routing in WSN. Primarily, the required nodes are deployed in the related WSN environment. The arithmetic function traced the nodes' higher energy consumption and malicious action to avoid security vulnerabilities during data transmission. The sensed data packets are transmitted based on the Rumor routing function of the proposed system. Furthermore, to avoid data access by unauthorized users, it is encrypted using the SKINNY Crypto mechanism. Finally, the network efficiency and security performance are validated in the NS3 platform. The model gained 98.1% network throughput, 95.6% PDR, a lower energy consumption of between 0.001 and 0.01 J, and a 99% confidentiality rate. The developed system provided increased network security and efficiency. [ABSTRACT FROM AUTHOR]

The widespread use and development of inertia friction welding is currently restricted by an incomplete understanding of the deformation mechanisms and microstructure evolution during the process. Understanding phase transformations and lattice strains during inertia friction welding is essential for the development of robust numerical models capable of determining optimized process parameters and reducing the requirement for costly experimental trials. A unique compact rig has been designed and used in‐situ with a high‐speed synchrotron X‐ray diffraction instrument to investigate the microstructure evolution during inertia friction welding of a high‐carbon steel (BS1407). At the contact interface, the transformation from ferrite to austenite was captured in great detail, allowing for analysis of the phase fractions during the process. Measurement of the thermal response of the weld reveals that the transformation to austenite occurs 230 °C below the equilibrium start temperature of 725 °C. It is concluded that the localization of large strains around the contact interface produced as the specimens deform assists this non‐equilibrium phase transformation. [ABSTRACT FROM AUTHOR]

Mode‐I Fracture Toughness, KIc, was measured in six shale materials using the double‐torsion technique. During loading, crack propagation was imaged both using twin optical cameras, and with fast X‐ray radiograph acquisition. Samples of Bowland, Haynesville, Kimmeridge, Mancos, Middlecliff, and Whitby shales were tested in a range of orientations. The measured fracture toughness values were found to be in good agreement with existing literature values. The two imaging techniques improve our understanding of local conditions around the fracture‐tip, through in situ correlation of mechanical data, inelastic zone size, and fracture‐tip velocity. The optical Digital Image Correlation technique proved useful as a means of determining the validity of individual experiments, by identifying experiments during which strains had developed in the two "rigid" specimen halves. Strain maps determined through Digital Image Correlation of the optical images suggest that the scale of the inelastic zone is an order of magnitude smaller than the classically used approximation suggests. This smaller damage region suggests a narrower region of enhanced permeability around artificially generated fractures in shales. The resolvable crack‐tip was tracked using radiograph data and found to travel at a velocity around 470 μm/s during failure, with little variation in speed between materials and orientations. Fracture pathways in the bedding parallel orientations were observed to deviate from linearity, commonly following layer boundaries. This suggests that while a fracture traveling parallel to bedding may travel at a similar speed to a bedding perpendicular fracture, it may have a more tortuous pathway, and therefore access a larger surface area. Plain Language Summary: Fracture toughness is a measure of the strength of a material, in the presence of existing flaws or cracks. Here fracture toughness was measured in six shale materials with fractures oriented both parallel and perpendicular to the bedding layers in the shales. During the experiments, the progressing fractures were imaged using both optical cameras and radiographs recorded using a synchrotron. The radiograph images were used to track the velocity of the progressing fracture, which did not vary strongly with different materials or orientations. The optical images were used to characterize the "damage zone" around the main fracture in which microfractures develop. This region was seen to be much smaller than conventional models suggest, which could imply that the developing fractures increase permeability over a much narrower region than previously believed. Key Points: Double‐torsion fracture toughness measurements were made in six shale materialsOptical digital image correlation was used to determine strain fields, and suggests an extremely small yielding zoneRadiograph imaging was used to track the fracture‐tip velocity and crack‐mouth opening displacement [ABSTRACT FROM AUTHOR]