The use of hat-shaped specimens to study the high strain rate shear behaviour of Ti–6Al–4V

Peirs, Jan; Verleysen, Patricia; Degrieck, Joris; Coghe, F.

doi:10.1016/j.ijimpeng.2009.08.002

Cited by 127 publications

(67 citation statements)

References 32 publications

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“…4a. It is important to mention that the shear stress shown on this graph is an overestimation because it is derived from the total force on top of the specimen [2]. Although, the negative stress triaxiality in the hat-shaped specimen ( fig.…”

Section: Resultsmentioning

confidence: 92%

“…The specimens used in this study are made out of a 0.6mm thick sheet with electrical discharge machining. For bulk materials the axis-symmetric hat-shaped specimen is used to obtain very high shear strains in a narrow zone [2]. When the hat part is pushed into the brim part, high stress and strain develops in the shear zone.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…For the specimens used in this study and for most specimens found in literature, the diameter of the hat is slightly larger than the diameter of the brim. This is done to increase the stress and strain homogeneity in the shear zone [2] but the consequence is that no pure-shear stress state is achieved. Because the stress state is a combination of shear and compression, a very high shear strain can be reached before fracture and thus the formation of an adiabatic shear band is promoted.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Experimental Study of the High Strain Rate Shear Behaviour of Ti6Al4V

Peirs

Verleysen

Degrieck

2011

AMM

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Abstract. Three different high strain rate shear test techniques are applied on the titanium alloy Ti6Al4V. Two techniques for testing of bulk materials and one technique for sheet materials are used: torsion of thin-walled tubes, compression of hat-shaped specimens and tension of planar shear specimens. The tests are carried out on respectively torsion, compression and tensile split Hopkinson bar setups. Although shear stresses dominate the stress state in these three tests, the local stress state and its distribution and evolution are different. Therefore, the three techniques are considered to be rather complementary than equivalent tests. In this work, the value of the three test techniques for material characterization is evaluated. Where possible, digital image correlation (DIC) is used to clarify the test results. In addition, parameters difficult to assess experimentally are estimated through finite element simulations of the three tests.

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Section: Resultsmentioning

confidence: 92%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study of the High Strain Rate Shear Behaviour of Ti6Al4V

Peirs

Verleysen

Degrieck

2011

AMM

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“…For testing bulk metals, the hat-shaped specimen [1] can be used. In this axissymmetric specimen, shear strains are concentrated in a narrow zone.…”

Section: A Bulk Materialsmentioning

confidence: 99%

High-Strain-Rate Shear Testing Applied to Ti-6Al-4V

Peirs

Verleysen

Degrieck

2010

AMR

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In this contribution, two experimental techniques to study the dynamic shear behaviour of metals are presented and applied to Ti-6Al-4V. For bulk materials hat-shaped specimens are subjected to a high-strain-rate load in a split Hopkinson compression bar set-up. For sheet materials a purpose-developed, novel shear specimen geometry, is loaded in a Hopkinson tensile bar set-up. The value of both techniques to assess the dynamic material behaviour is discussed. The experiments are optimized by means of numerical simulations. Digital image correlation is used to extract the specimen deformation from high speed camera recordings. It is shown that the dynamic behaviour, including fracture of Ti-6Al-4V differs considerably from the static behaviour. Both experimental techniques gain complementary information.

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“…ASBs have been observed in many cases such as machine chips, ballistic impact loading shear and so on. Normally, adiabatic shearing is undesirable because the formation of ASBs makes the material to lose its load carrying and energy dissipation capacity and even to be failure [2] . On the other hand, recently developed adiabatic cutting and blanking techniques intentionally use the ASBs phenomenon [3] .…”

Section: Introductionmentioning

confidence: 99%