Abstract
Torsion Split Hopkinson Bar (TSHB) is widely used in the dynamic shear characterization of material under pure shear loading. In TSHB, tubular specimens with either circular or hexagonal flanges are used. The specimens with circular flanges are generally bonded using adhesive to the incident and transmission bars. The specimens with hexagonal flanges are gripped into the hexagonal holders that are fixed onto incident and transmission bars. In the current study, numerical simulations are carried out to see the effect of gripping arrangements on the dynamic shear characterization quality. Numerical experiments with three gripping configurations are studied—the first gripping configuration with a direct bond (numerically-tie) between specimen and bars. The second configuration with the specimen gripped by hexagonal holders fixed to bars. The third configuration with specimen directly gripped into the incident and transmission bars having hexagonal slots.
Highlights
Torsion Hopkinson Bar (TSHB) is used for determining the shear response of material for strain rates in range of 102 s-1 to 104 s-1 [1]
3.1 Perfectly bonded with hexagonal flanges specimen: In perfectly bonded case, the specimen end faces are directly tied to incident and transmission bar interfaces
The specimen shear stress and shear strain of all the elements in the gauge section are directly taken from are averaged to compute the direct taken specimen shear stress- shear strain data. This data is compared with the TSHB formulation shear stress-shear strain plot
Summary
Torsion Hopkinson Bar (TSHB) is used for determining the shear response of material for strain rates in range of 102 s-1 to 104 s-1 [1]. Adhesive bonding of tubular specimen between incident and transmission bar is commonly used technique in TSHB[5]. When testing material with high stiffness and strength, the adhesive shear strength needs to be sufficient enough to avoid failure at the bonded region. Even when large diameter circular flanges are used, the limited strength of the adhesives allow testing merely low strength materials. To overcome these disadvantages in adhesive bonding, the specimens are gripped using hexagonal holders. The simulations are carried out in ABAQUS/Explicit academic research software
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