Understanding the deformation and fracture mechanisms in backward flow-forming process of Ti-6Al-4V alloy via a shear modified continuous damage model

Singh, Abhishek Kumar; Kumar, Abhishek; Narasimhan, K.; Singh, Ramesh

doi:10.1016/j.jmatprotec.2021.117060

Cited by 19 publications

(11 citation statements)

References 27 publications

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“…As a matter of fact, titanium alloys are widely used in aerospace, automotive, and biomedical and chemical industries due to their superior properties, such as their corrosion resistance and high strength-to-weight ratio [19][20][21][22][23]. In such a context, Ti-6Al-4V here examined has excellent tensile (tensile strength ≥ 895 MPa) and fatigue strength (equal to about 460MPa at a number of loading cycles of 109 under rotating bending), as well as high resistance to a wide spectrum of corrosive environments, with respect to other titanium based alloys, due to its inclination to form protective surface oxides [24][25][26][27][28][29][30][31][32][33][34][35]. As such, it is used in lifelimit components of civil aviation engines and as fractured critical components of military engines [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening

Vantadori

2021

Materials

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The present paper is dedicated to the theoretical evaluation of a loading feature, that may have a significant influence on fatigue phenomenon: non-proportionality. As a matter of fact, considerable interactions between dislocations, leading to the formation of dislocation cells, cause additional cyclic hardening of material. Such a phenomenon is experimentally observed for materials sensitive to non-proportionality. In such a context, the present paper is aimed to propose a novel multiaxial strain-based criterion, the refined equivalent deformation (RED) criterion, which allows to take into account, in fatigue life estimation, both strain amplitude and additional cyclic hardening. The accuracy of the novel criterion is evaluated by considering experimental tests, performed on Ti-6Al-4V specimens, subjected to multiaxial LCF loading.

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Section: Introductionmentioning

confidence: 99%

A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening

Vantadori

2021

Materials

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“…Zhang et al [20]investigated the mechanisms underlying deformation and fracture for Ti-6Al-4V alloys under different heat treatments and noted that excellent hardening and deforming behaviour can be achieved at the beta-transus temperature (980 °C). Further, Singh et al [21] suggested that the increase of cooling rate may increase the hardening effects. This was principally ascribed to the maintenance of constant temperature and rapid cooling rate on surface which increased the volume of ′-martensite and grain refinement within the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Application of machine learning on tool path optimisation and cooling lubricant in induction heating-assisted single point incremental sheet forming of Ti-6Al-4V sheets

Chen

Hassan

et al. 2022

Int J Adv Manuf Technol

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Induction heating-assisted single point incremental sheet forming was established for Ti-6Al-4V thin sheets at closed and above beta-transus temperature (980 °C). In order to eliminate geometric inaccuracy and adherence of lubricant on the surface caused by elevated temperature, a cooling lubricant system was designed for the forming tool to decrease the thermal expansion and friction. A radial basis function (RBF)-based tool path optimisation was developed to study the measured geometric accuracy, temperature, and forming force. By adjusting cooling lubricant control and integrating the RBF framework, the first optimised tool path was used to collect the results and to validate with the finite element (FE) model and theoretical geometric profiles. The output data were further studied by RBF and generate a second optimised tool path. The measured geometric coordinates revealed that the error percentage has been reduced to less than 5%. Further, the microstructure evolution analysed by scanning electron microscopy (SEM) indicated noticeable oxidation and alpha-layer for temperature around 1040 °C and the phenomenon was removed at temperature closed to 950 °C. The surface roughness and energy-dispersive X-ray analysis (EDX) revealed the optimised tool path distributed significant improvement in surface quality. The cooling lubricant system indicated optimal performance with RBF optimised tool path to support constant temperature and reduce friction and lubricant adherence on the surface.

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“…The results showed that Lemaitre criterion could effectively predict the cracking location, but the prediction location of C&L criterion was inconsistent with the reality. Singh [12] IOP Publishing doi:10.1088/1757-899X/1270/1/012038 2 compared the damage behavior of backward spinning of single roller, three roller and wedge feed, and found that the stress state of the maximum damage location was different, but all fracture occurred under tensile stress state. Due to the different width of stiffeners, the spinning forming process is more complicated and uneven material flowing is more prominent.…”

Section: Introductionmentioning

confidence: 99%

Spinning deformation mechanism of aluminum alloy cylinder with multi-level stiffeners based on numerical simulation

Meng

Lai

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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This paper focuses on the deformation mechanism of aluminum alloy cylinder with multi-level stiffeners in flow spinning. A flow spinning finite element model is established based on ABAQUS software, and the material flowing and damage behavior between different width stiffeners were analyzed. The research results can provide guidance for spinning process of aluminum alloy cylinder with multi-level stiffeners.

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Understanding the deformation and fracture mechanisms in backward flow-forming process of Ti-6Al-4V alloy via a shear modified continuous damage model

Cited by 19 publications

References 27 publications

A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening

A Novel Multiaxial Strain-Based Criterion Considering Additional Cyclic Hardening

Application of machine learning on tool path optimisation and cooling lubricant in induction heating-assisted single point incremental sheet forming of Ti-6Al-4V sheets

Spinning deformation mechanism of aluminum alloy cylinder with multi-level stiffeners based on numerical simulation

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