Applications In Aviation Industries Research Articles

Digital twin applications in aviation industry: A review

Digital twin applications in aviation industry: A review

Geometrical texture and surface integrity in helical milling and ultrasonic vibration helical milling of Ti-6Al-4V alloy

Abstract Surface integrity of hole-making for Ti-6Al-4 V alloy is very important due to its application in aviation industry. Geometrical and mechanical behaviors of machined holes by helical milling (HM) and ultrasonic vibration helical milling (UVHM) were investigated. The textures of machined holes by the two processes were analyzed and the distances of adjacent textures were calculated according to the movement of peripheral edges. Due to the different surface geometrical textures, the hole-diameter error and surface roughness in UVHM are smaller than those of HM. A plastic deformation layer with thickness of 4–6 μm was observed by the distorted β phase in the cross-section of hole-surface in UVHM by SEM results. Compared with HM process, UVHM generates larger hardness at the subsurface of machined holes (20–200 μm) due to the material deformation caused by ultrasonic vibration. Compared with HM, the compressive residual stress of hole surface was increased larger than 63.5% by UVHM. The compressive stresses in UVHM are larger than 150 MPa at the depth less than 10 μm, which is consistent with the microstructure evolution caused by mechanical deformation.

Ultrasonic Torsion Welding of Aging Resistant Al/CFRP Joints - Concepts, Mechanical and Microstructural Properties

Multi-material-design offers high potential for weight saving and optimization of engineering structures but inherits challenges as well, especially robust joining methods and long-term properties of hybrid structures. The application of joining techniques like ultrasonic welding allows a very efficient design of multi-material-components to enable further use of material specific advantages and are superior concerning mechanical properties.The Institute of Materials Science and Engineering of the University of Kaiserslautern (WKK) has a long-time experience on ultrasonic welding of dissimilar materials, for example different kinds of CFRP, light metals, steels or even glasses and ceramics. The mechanical properties are mostly optimized by using ideal process parameters, determined through statistical test planning methods.This gained knowledge is now to be transferred to application in aviation industry in cooperation with CTC GmbH and Airbus Operations GmbH. Therefore aircraft-related materials are joined by ultrasonic welding. The applied process parameters are recorded and analyzed in detail to be interlinked with the resulting mechanical properties of the hybrid joints. Aircraft derived multi-material demonstrators will be designed, manufactured and characterized with respect to their monotonic and fatigue properties as well as their resistance to aging.

Research on Stable Forming of Titanium Alloy Bar Using Three-Roll Skew Rolling

Titanium alloy with high strength, corrosion resistance, heat resistance and many other advantages has widely applications in aviation industry and the military-industrial complex. The market demand for titanium alloy increases year by year. However, the rolling technology for small size titanium rod is not mature due to its poor plasticity and difficult processing. In addition, current titanium alloy bar can not meet the high-end market requirements, it still largely dependents on imports now. Developing high-quality titanium bars is a major aim of titanium industry in our country in the future. Three-roll rolling is one of mature methods in current production of titanium alloy bars. Using this processing method for rolling titanium alloy bars, multi-standard, low-volume production requirements can be achieved.

ANALYSIS OF RUBBER FORMING PROCESS OF FIRE BARRIER FROM TITANIUM CP2 ALLOY FOR AW 139 HELICOPTER

This paper presents conditions of forming products from titanium sheets by means of rubber stamping method. After introducing the issues connected with these elements manufacturing for aviation industry, considering standards and legal regulations, technological problems occurring during forming deep stiffening ribs. The results in the characteristic curvatures and distortion in the final products were generated in the process heterogeneous internal stress state. The Authors aimed at explaining and presenting of solutions limiting occurrence of chosen shape faults, which disqualify these products application in aviation industry. The proposed solutions significantly reduced the incidence of these unfavorable phenomena. The modified method of rub ber stamping of firewall from titanium alloy CP-2 sheet was successfully implement ed in manufacturing conditions of PZL Swidnik.

Study on Mechanical Properties of 2024 Al Sheet Treated by SMAT

SMAT is applied as an innovation surface enhancement technology to introduce compressive stress in metallic materials. The strengthening effects of SMAT in mechanical properties were investigated on aluminium alloy. The yield strength obtained under tensile test had significant improvement which may achieve up to 440 MPa. In this paper, the experimental setup and results will be briefly described. Tensile properties measured before and after SMAT at ambient temperature. Results show that the highest strength that can be attained is 544 MPa by SMATed sheet of 1 mm thickness for 15 minutes and 518 MPa for the 2.5 mm one SMATed with 45 minutes, with the desirable ductility. The present study demonstrates this high strength and corrosion resistance aluminium alloy can be a potential candidate for applications in aviation industries.

Experimental investigation of a novel hybrid metal–composite joining technology

An integrative joining technology between steel and carbon fibre-reinforced plastics (CFRP) is presented for lightweight design applications in aviation industries. Small spikes are welded onto metal surfaces via “cold-metal transfer” which then build up a fibre-friendly fixation through form-closure with co-cured composites. Manufacture of such reinforced hybrid specimens and results of static tensile testings are discussed. Video-extensometry is applied to characterize the hybrid joints in terms of strength and failure history. Comparisons with epoxy bonded references show improvements in ultimate load, maximum deformation and energy absorption capacity.

Modern acoustic emission technique and its application in aviation industry

This paper proposes the concept of modern acoustic emission (MAE) technique and describes its application in aviation industry. Modern AE is characterized by the combination of AE parameter and waveform analysis based on the understanding of AE source mechanism, the property of sound wave propagation and the interaction between sound wave and the medium in which the sound wave is propagating. Another feature of MAE is characterized by the application of so-called fully digital AE apparatus with low noise, high speed of data transmission and accurate AE source locating capability. MAE is merely an imagination without the realization of the advanced fully digital AE instrument. The application of MAE in monitoring the conditions of aircraft structures during a fatigue test was taken as an example for showing the important role played by AE. Roles of AE in the evaluation of (environment-related) corrosion damage of aircraft were also presented.

Development of a Knowledge Management Culture Assessment Tool with Applications in Aviation Industry

Knowledge management (KM) attracts more and more attention nowadays in either research or practice. Organisations often spend a lot of time and money to launch strategic KM initiatives without first assessing whether or not their culture is ready for the implementation of such initiatives. If the culture is not ready for implementing the initiatives, the effort put will rarely produce significant long-term benefits. Instead, employees will perceive them as a waste of time, and participate less actively in the KM initiatives. In this paper, a KM culture assessment tool (KMCAT) is purposely developed for assessing the organisational culture so as to ensure the success of implementation of KM initiatives. The KMCAT takes into account coherence, control, alliance and partnership, information and communication technology as well as innovation, which help an organisation to reveal culture profiles and hence provide directions for managing the culture. A case study of applying the KMCAT is undertaken in an aviation company and encouraging results are obtained.