Rainbow trapping is a significant strategy for capturing waves of different frequencies at spatial positions. It offers potential multi-frequency on-chip nanophotonic devices in the era big data and has attracted much interest recently, topological rainbow that immune to disorder been observed optics acoustics. Reported here elastic using gradient valley phononic crystal plates (PCPs) with hexagonal lattice, based on edge states are localized boundary between two PCPs opposite phases. The...

Due to its weak dependence on the amount of uncertainty information, non-probability convex model approach can be used deal with problems without sufficient information. In this paper, by integrating response surface (RS) technique approach, a new structural reliability analysis method is developed for many complex engineering black-box limit-state functions. Using newly correlation model, multi-dimensional ellipsoid efficiently constructed characterize uncertain parameters. A quadratic...

Ultrasonic vibration (UV)-assisted forming technology has emerged as a significant advancement in the field of bulk micro-forming. This study presents comprehensive experimental investigation into micro-scale deformation behavior metallic materials and its influence on size effects under UV, with specific focus UV-assisted T-shaped micro-upsetting T2 copper. Utilizing custom-designed apparatus, flow stress, filling height, microstructural evolution copper are systematically examined,...

The presence of valley-locked waveguides in topological insulators offers innovative possibilities for the modulation wave propagation, addressing challenges associated with limited transmission pathways and loss acoustic energy during transmission. In this research, we consider a two-dimensional gradient sonic crystal characterized by hexagonal lattice structure, which is engineered to achieve rainbow trapping via dual-band waveguide mechanisms. By conducting detailed analysis unit cells,...

The uncertain buckling and reliability of the laminated piezoelectric functionally graded material (FGM) cylindrical shells subjected to axially compressed loads are investigated in this research. Considering shear deformation, governing equations FGM derived on basis Donnell assumptions. And then nonprobabilistic convex model is introduced predict resulting from unavoidable scatter structural parameters. Finally, degree structures obtained by computing ratio multidimensional volume falling...

Compared with the probability model, convex model approach only requires bound information on uncertainty, and can make it possible to conduct reliability analysis for many complex engineering problems limited samples. Presently, by introducing well-established techniques in probability-based analysis, some methods have been successfully developed reliability. This paper aims reveal different phenomena furthermore severe paradoxes when extending widely used first-order method (FORM) into...

The performance of adhesive-bonded joints, which are being increasingly used in the aerospace and automotive industries, under hot-humid conditions remains largely unknown. effect surface treatments on strength durability aluminum-lithium (Al-Li) alloy joints exposure was investigated. Varied characteristics were achieved by different mechanical chemical treatments; combined phosphoric acid anodization (PAA) also used. then exposed to a environment. morphology, degradation, failure modes,...

In this study, synchronous cutting of concave and convex surfaces for hypoid gear was achieved using a duplex helical method. Precise, nonlinear optimization the transmission error driven by machine tool parameters performed to reduce vibration noise pair. First, curve contact path tooth surface initial pinion were solved analysis. Second, according preset parabolic curve, used generate target pinion, which coincided with pinion. Finally, deviation correction model discrete points,...

Abstract For the hypoid gear pair of heavy-duty vehicle drive axle machined by duplex helical method, in order to avoid edge contact and stress concentration on tooth surface, a four-segment tool profile is designed modify concave convex surfaces simultaneously. First, geometric model established. Second, mathematical method based established, solving surface generated connecting points given. Finally, finite element loaded analysis used analyze meshing performance obtained modification,...