Total fatigue life prediction for Ti-alloys airframe structure based on durability and damage-tolerant design concept

Zhang, Ji-kui; Cheng, Xiaoquan; Zhengneng, Li

doi:10.1016/j.matdes.2010.03.052

Cited by 35 publications

(11 citation statements)

References 12 publications

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“…Therefore, tensile strength, ductility, and fatigue properties of the alloy can be modified by thermomechanical treatment [5–7]. This makes it possible to produce various types of the alloy microstructure, i.e., bimodal, equiaxed, or Widmanstätten type [8, 9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2019

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In this article, the authors discuss the results of studies into the processing of Ti-5Al-5Mo-5V-1Cr-1Fe near-β titanium alloy (Ti-55511) by electron beam melting (EBM), an additive manufacturing technique. Due to its high flexibility in shaping mechanical properties, Ti-55511 alloy is commonly used in aircraft components such as landing gear or airframes. In this study, Ti-55511 powder was used and its properties were described as regards chemical composition and particle size distribution in order to assess its suitability for EBM processing and repeatability of results. 20 sets of processing parameters were tested in the energy input range between 10 J/mm3 and 50 J/mm3 (cathode current, 4.5 mA-19.5 mA; scanning speed, 1080 mm/s–23400 mm/s). Four types of top surfaces were obtained, namely, flat, orange peel, with single pores, and with swelling. Best results were obtained for the energy of 30 J/mm3: flat top surface and relative density in excess of 99.9%. Analysis of chemical composition showed that aluminum loss was below the specification minimum for the analyzed parameter sets. Scanning speed most significantly affected aluminum content: the lower the scanning speed, the higher the aluminum loss. Analysis of microstructures showed the dependence of lamellar α-phase volume fraction on the process parameters used. For low scanning speed, the determined α-phase volume accounted for about 78%. Higher scanning speed resulted in a decrease of the α-phase content to 61%. The dimensions of the lamellas and the amount of the α-phase strongly effected hardness results (360 HV to 430 HV).

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Section: Introductionmentioning

confidence: 99%

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

et al. 2019

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“…Nowadays, the damage-tolerant design concept [1,2] is commonly used in aerospace engineering to manage the extension of cracks in structure through the application of the fracture mechanics. In order to realize low cost and long-life safe flight, the demands for improved damage tolerance properties of materials keep increasing.…”

Section: Introductionmentioning

confidence: 99%

The fracture toughness and its prediction model for Ti–5Al–5Mo–5V–1Cr–1Fe titanium alloy with basket-weave microstructure

Shi

Zeng

Shi

et al. 2015

Journal of Alloys and Compounds

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“…[3][4][5] Because of the practical need and application value, establishing appropriate fatigue theories for various kinds of engineering structures is a particular area of focus in fatigue research. 6,7 Considering the critical influence of load on structural fatigue, many different kinds of specialized fatigue-design methods have been put forward for specific types of environmental and working loads that can provide the fatigue capacities of the materials or structures independently of the load, in order to facilitate practical application.…”

Section: Introductionmentioning

confidence: 99%

An extended method of estimating the fatigue performance of mechanical structures with fasteners subject to shear loads

Dai

Chen

Zhang

et al. 2018

Advances in Mechanical Engineering

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Prediction accuracy is a key problem in estimating the fatigue resistance of engineering structures. Here, we consider mechanical structures with fasteners that are simultaneously subjected to a combination of shear and tension (or compression) loads. The currently used detail fatigue rating method is modified and an extended detail fatigue rating method is proposed to improve the estimation results. This is achieved by considering the effect of the load, stress concentration, and fatigue failure criterion on the fatigue capacity. An experimental assessment is also made of many specimens with different structures. A comparison of the estimation results obtained using the extended detail fatigue rating method and the experimental results shows that the new method gives results that are acceptable in engineering practice.

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Total fatigue life prediction for Ti-alloys airframe structure based on durability and damage-tolerant design concept

Cited by 35 publications

References 12 publications

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

The Effect of EBM Process Parameters on Porosity and Microstructure of Ti-5Al-5Mo-5V-1Cr-1Fe Alloy

The fracture toughness and its prediction model for Ti–5Al–5Mo–5V–1Cr–1Fe titanium alloy with basket-weave microstructure

An extended method of estimating the fatigue performance of mechanical structures with fasteners subject to shear loads

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