Role of anisotropy on strain localization at high-strain rates in Ti6Al4V

Corallo, Luca; Revil-Baudard, Benoît; Cazacu, Oana; Verleysen, Patricia

doi:10.1016/j.euromechsol.2022.104856

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…The pre-necking true curve can be simply obtained using the conventional length-based approach, which is still commonly employed today [15]. However, deriving the true curve after necking onset becomes challenging for anisotropic materials.…”

Section: Introductionmentioning

confidence: 99%

True stress-strain identification accounting for anisotropy of sheet metals

Mirone,

Barbagallo,

Bua

et al. 2024

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

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Sheet metals for the automotive industry are subjected to continuous research efforts aiming at ever increasing mechanical performance. A remarkable feature of modern high strength sheet metals is their anisotropy, intrinsic in the technologic process of their production. When the effect of anisotropy on the mechanical response of a material cannot be neglected, specimens along different directions are usually tested, possibly under different stress states, to assess the flow curves and the deforming ratios for each direction and each loading mode. Such data are then used to calibrate many possible plastic anisotropy models available in the literature. In this work, the experimental procedures for determining the stress-strain curve and the anisotropic straining ratio are studied in detail, referring to representative tensile tests along the rolling direction of two anisotropic sheet metals, respectively PHS-1800 steel and 6181 aluminium alloy. Both alloys are ductile and exhibit remarkably long post-necking phases in tension, revealing that, in such cases, the standard procedures for the experimental derivation of the hardening curves and of the anisotropic strain ratios are limited to the very early phases of the material life and miss to cover the major part of the strain range up to failure. Different alternative procedures for the derivation of experimental data and for their postprocessing are considered and compared to each other, identifying a set of guidelines for achieving a good engineering accuracy up to failure in deriving both the stress-strain curves and the anisotropic strains ratios. The above analyses are made on the results of tensile tests at static, intermediate and high strain rate, confirming the generality of the identified procedure.

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Section: Introductionmentioning

confidence: 99%

True stress-strain identification accounting for anisotropy of sheet metals

Mirone,

Barbagallo,

Bua

et al. 2024

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

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“…In this regard, the dynamic punch test is of particular importance as high stress states taking place at high strain rates activate additional dislocation glide systems which influence the effects of plastic anisotropy. Experimental studies at high strain rates of the Ti6Al4V alloy using a split Hopkinson bar showed a significant decrease in the influence of plastic anisotropy on the mechanical behavior at strain rates above 100 s -1 [24]. Therefore, the use of high-speed stamping and forming modes of products from sheet hcp alloys with a certain deformation anisotropy can increase not only productivity, but also the quality of topological parameters of the resulting products.…”

Section: Introductionmentioning

confidence: 99%

Ductile Fracture of Titanium Alloys in the Dynamic Punch Test

Skripnyak,

Skripnyak

2024

Metals

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Estimates of physical and mechanical characteristics of materials at high strain rates play a key role in enhancing the accuracy of prediction of the stress–strain state of structures operating in extreme conditions. This article presents the results of a combined experimental–numerical study on the mechanical response of a thin-sheet rolled Ti-5Al-2.5Sn alloy to dynamic penetration. A specimen of a titanium alloy plate underwent punching with a hemispherical indenter at loading rates of 10, 5, 1, and 0.5 m/s. The evolution of the rear surface of specimens and crack configuration during deformation were observed by means of high-speed photography. Numerical simulations were performed to evaluate stress distribution in a titanium plate under specified loading conditions. To describe the constitutive behavior and fracture of the Ti-5Al-2.5Sn alloy at moderate strain rates, a physical-based viscoplastic material model and damage nucleation and growth relations were adopted in the computational model. The results of simulations confirm a biaxial stress state in the center of specimens prior to fracture initiation. The crack shapes and plate deflections obtained in the calculations are similar to those observed in experiments during dynamic punching.

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“…Here, the angle between the loading direction and the fracture surface plane is defined as the fracture angle. This angle is a critical parameter that reflects the material's failure mode under tensile loading [10]. Experimental and numerical modeling results show that the fracture angle of the tensile specimen is highly dependent on the ratio of its thickness and width, known as the aspect ratio (AR).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Strain Rate Influence on Anisotropy of Uniaxial Tensile Mechanical Properties of CuFe2P Alloy Sheet

Bubalo,

Tonković,

Krstulović-Opara

et al. 2024

Materials

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Wire crimping, a process commonly used in the automotive industry, is a solderless method for establishing electrical and mechanical connections between wire strands and terminals. The complexity of predicting the final shape of a crimped terminal and the imperative to minimize production costs indicate the use of advanced numerical methods. Such an approach requires a reliable phenomenological elasto-plastic constitutive model in which material behavior during the forming process is described. Copper alloy sheets, known for their ductility and strength, are commonly selected as terminal materials. Generally, sheet metals exhibit significant anisotropy in mechanical properties, and this phenomenon has not been sufficiently investigated experimentally for copper alloy sheets. Furthermore, the wire crimping process is conducted at higher velocities; therefore, the influence of the strain rate on the terminal material behavior has to be known. In this paper, the influence of the strain rate on the anisotropic elasto-plastic behavior of the copper alloy sheet CuFe2P is experimentally investigated. Tensile tests with strain rates of 0.0002 s−1, 0.2 s−1, 1 s−1, and 5.65 s−1 were conducted on sheet specimens with orientations of 0°, 45°, and 90° to the rolling direction. The influence of the strain rate on the orientation dependences of the stress–strain curve, elastic modulus, tensile strength, elongation, and Lankford coefficient was determined. Furthermore, the breaking angle at fracture and the inelastic heat fraction were determined for each considered specimen orientation. The considered experimental data were obtained by capturing the loading process using infrared thermography and digital image correlation techniques.

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Role of anisotropy on strain localization at high-strain rates in Ti6Al4V

Cited by 7 publications

References 31 publications

True stress-strain identification accounting for anisotropy of sheet metals

True stress-strain identification accounting for anisotropy of sheet metals

Ductile Fracture of Titanium Alloys in the Dynamic Punch Test

Experimental Investigation of Strain Rate Influence on Anisotropy of Uniaxial Tensile Mechanical Properties of CuFe2P Alloy Sheet

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