Bio: Hao Cui is an academic researcher from Yantai University. The author has contributed to research in topics: Fractography & Crack closure. The author has an hindex of 2, co-authored 2 publications receiving 12 citations.
TL;DR: In this article, a high-frequency fatigue test and finite element (FE) methods were used to study the fatigue behavior of aluminum alloy 7050-T7451 single lap four-bolted joints.
TL;DR: In this article, the authors investigated the fatigue behavior of single-lap four-riveted aluminum alloy 7050 joints by using high-frequency fatigue test and scanning electron microscope (SEM).
Abstract: The fatigue behavior of single-lap four-riveted aluminum alloy 7050 joints was investigated by using high-frequency fatigue test and scanning electron microscope (SEM). Stress distributions obtained by finite element (FE) analysis help explain the fatigue performance. The fatigue test results showed that the fatigue lives of the joints depend on cold expansion and applied cyclic loads. FE analysis and fractography indicated that the improved fatigue lives can be attributed to the reduction in maximum stress and evolution of fatigue damage at the critical location. The beneficial effects of strengthening techniques result in tearing ridges or lamellar structure on fracture surface, decrease in fatigue striations spacing, delay of fatigue crack initiation, crack deflection in fatigue crack propagation and plasticity-induced crack closure.
08 Nov 2018-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the effect of pouring temperature and the surface angle of vortex casting on microstructural evolution and mechanical properties of 7050Al-3wt%SiC composite was studied.
Abstract: In this investigation, the effect of pouring temperature and the surface angle of vortex casting on microstructural evolution and mechanical properties of 7050Al-3 wt%SiC composite was studied. Two pouring temperatures of 700 °C and 800 °C were employed during the vortex casting. As well, two surface angles of 45° and 90° were used for the vortex casting. Cast microstructures were analyzed by Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), and optical microscope. Mechanical properties were measured by uniaxial tensile test, Vickers hardness and Charpy impact test. Microstructural studies showed a uniform distribution of SiC particles in the 7050 Al matrix is achievable by increasing the pouring temperature from 700 °C to 800 °C and also by decreasing the surface angle from 90° to 45°. This uniform distribution of particles was coincided with the breaking of the dendrite arms in the microstructure of 7050 Al-3 wt% SiC. Mechanical properties measurements showed that the yield strength, hardness and fracture energy of the composite were increased by increasing the pouring temperature and reducing the surface angle during the vortex casting.
TL;DR: In this paper, the laser texturing process was used to obtain the most optimized strengthened cylindrical sleeve surface for nickel-based superalloy hole components, and the Hertz contact rotary expansion process (HCREP) was applied to the hole components.
TL;DR: In this paper , the relationship between welding quality and energy consumption was investigated by optimizing process parameters during the 2 mm thickness 6061 aluminum alloy laser welding, and the Non-dominated Sorting Genetic Algorithm-III (NSGA-III) was utilized to minimize energy consumption while maintaining good welding quality.
Abstract: Laser welding, a key and competitive technology for advanced industrial manufacturing is powered by energy. With increasing attention to energy management and environmental protection in manufacturing, reducing energy consumption is imperative. However, the traditional optimization of laser welding has been mainly focused on welding quality without considering the total energy consumption of all components. Thus, this paper researches the relationship between welding quality and energy consumption by optimizing process parameters during the 2 mm thickness 6061 aluminum alloy laser welding. Firstly, a three-factor, three-level experiment using Central Composite Design (CCD) is constructed. Secondly, Kriging models are employed to construct the models between process parameters and objectives. Finally, the Non-dominated Sorting Genetic Algorithm-III (NSGA-III) is utilized to minimize energy consumption while maintaining good welding quality. The study shows that compared to the initial scenario, optimization can reduce energy consumption while increasing welding quality.
07 Jan 2019
TL;DR: In this article, the influence of squeeze force and initial fit tolerance on the fatigue property of a riveted aircraft lap joint was analyzed under six levels of fatigue loads and the results showed that an initially oversized rivet might be detrimental to fatigue-life improvement.