Impact Simulation of Rocks under SHPB Test

Chakraborty, T.

doi:10.16943/ptinsa/2013/v79i4/47985

Cited by 7 publications

(5 citation statements)

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“…The incident trapezoidal stress impulse maximum intensity can be estimated with the help of the following equation: And the time duration of the created stress impulse is given by equation (3): where V denotes the striker bar velocity and L s represents the striker bar length. 22…”

Section: Methodsmentioning

confidence: 99%

“…The volumetric locking of C3D8R elements permits large deformation without any significant changes in results, which is the main common problem in the impact and large deformation investigations. 22 Figure 3 shows the meshing of the bars and the specimen. The mesh convergence study has also been performed for the developed FEA model to evaluate the adequacy of meshing.…”

Section: Modeling Of Compressive Shpb Processmentioning

confidence: 99%

“…where V denotes the striker bar velocity and L s represents the striker bar length. 22 Equation ( 4) was used to determine the force equilibrium between incident and specimen contact interface, and specimen and transmitted bar contact interface:…”

Section: Shpb (High Strain Rate) Experimentationmentioning

confidence: 99%

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A computational investigation on the influence of the l/d ratio and strain rate on the deformation behavior of rolled and homogeneous armor steel in the split Hopkinson pressure bar test process

Saxena

Dwivedi

Srivastava

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The present investigation deals with the finite-element analysis of the high strain rate deformation behavior of the quenched and tempered armor-grade rolled and homogeneous armor steel. The rolled and homogeneous armor steel is extensively used in civil and military structures such as battle tanks, armament combat vehicles, combat helicopter, etc. The dynamic deformation behavior of rolled and homogeneous armor steel, that is, resistance against ballistic circumstances relates to its mechanical behavior under high strain rate conditions. In the present research work, a finite-element analysis investigation (using Abaqus finite-element analysis code) has been carried out to evaluate the influence of specimen l/d ratios and high loading strain rates on the deformation behavior and stress–strain responses of the rolled and homogeneous armor steel. Further, an attempt has also been made to check the high strain rate and specimen l/d ratio influence on the strain amplitudes of incident, reflected, and transmitted pulses. The numerical investigation has been carried out with the rolled and homogeneous armor steel specimen with l/d ratios of 1, 0.8, and 0.6. In addition, three high impact strain rates of 2130, 2907, and 3105 s−1 are considered to evaluate the stress–strain responses. The results revealed that the l/d ratio and strain rate have a significant influence on the specimen stress–strain response and the strain amplitudes of incident, reflected, and transmitted pulses. The peak stress value is increased with the increase in the l/d ratio and strain rate. The developed finite-element analysis model has predicted the stress–strain responses with <3% percentage error. The obtained finite-element analysis results have been validated with the experimental investigation with an l/d ratio of 0.6 and a strain rate of 3105 s−1 for rolled and homogeneous armor steel.

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Section: Methodsmentioning

confidence: 99%

Section: Modeling Of Compressive Shpb Processmentioning

confidence: 99%

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A computational investigation on the influence of the l/d ratio and strain rate on the deformation behavior of rolled and homogeneous armor steel in the split Hopkinson pressure bar test process

Saxena

Dwivedi

Srivastava

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The test process of ceramics in SHPB tests was numerically simulated by Anderson et al [11], and the dynamic condition and loss efficacy of the ceramics were studied. Chakraborty [12] used finite element software to simulate SHPB tests on rocks and achieved good correlation with experimental results. However, numerical simulation of SHPB experiments on frozen soil has not yet been reported.…”

Section: Introductionmentioning

confidence: 92%

Dynamic Mechanical Behavior and Numerical Simulation of Frozen Soil under Impact Loading

Zhang

Zhu

Liu

2016

Shock and Vibration

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Split Hopkinson pressure bars (SHBP) were used to perform impact experiments on frozen soil under various impact velocities and temperatures to analyze the effect of these parameters on the mechanical behavior of the soil. Based on the Holmquist-Johnson-Cook constitutive model, the dynamic mechanical properties under impact loading were analyzed. The SHPB experiments of frozen soil were also simulated using the finite element analysis software LS-DYNA, and the simulation results were similar to the experimental results. The temperature effect, strain rate effect, and the destruction process of the frozen soil as well as the propagation process of stress waves in the incident bar, transmission bar, and frozen soil specimen were investigated. This work provides a good theoretical basis and technical support for frozen soil engineering applications.

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“…The properties used for steel are given in Table 2. The stress-strain parameters and dynamic increase factor (DIF) values for soft sandstone were adopted from Chakraborty [38]. The projectile was assumed to be a rigid non-deformable steel projectile with a weight of 33.665 kg.…”

Section: Materials Propertiesmentioning

confidence: 99%

Numerical Analysis of a High-Velocity Projectile’s Impact on Shallow Steel Tunnels in Soft Sandstone

Sarmah,

Dutta,

Rao

2024

Infrastructures

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Tunnels are underground infrastructures intended for diverse community applications as well as military applications. During impact loading due to high-velocity projectiles such as ballistic missiles, materials experience a high strain rate. Moreover, there is a superficial augmentation of the dynamic strength when geomaterials such as rock are subjected to a high strain rate. Despite this strength enhancement, tunnels can get damaged by the impact load of a projectile hitting at a high velocity if they are present at a shallow depth. The present study is an effort to comprehend the response of a shallow tunnel in soft sandstone due to the impact load by a ballistic projectile using the FEM-based software ABAQUS/CAE 6.11. The Drucker–Prager damage model and the Johnson–Cook damage model were used to define the properties of the rock mass and steel tunnel lining, respectively. The crown of the 3 m diameter tunnel was kept at different depths from 1 m to 5 m from the surface. A striking velocity of 1000 m/s at a normal position to the target was given to the projectile. The projectile caused noticeable damage to the tunnel lining up to 3 m crown depth. Increasing the crown depth had a positive effect on the maximum depth of the projectile penetration up to 4 m tunnel crown depth, after which the effect reversed, making the tunnel safer. The maximum von Mises stress on the tunnel lining reduced in a logarithmic trend with an increase in the crown depth, gradually lowering to an impact load lesser than the yield stress of the tunnel lining material after a crown depth of 4.5 m.

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Impact Simulation of Rocks under SHPB Test

Cited by 7 publications

References 0 publications

A computational investigation on the influence of the l/d ratio and strain rate on the deformation behavior of rolled and homogeneous armor steel in the split Hopkinson pressure bar test process

A computational investigation on the influence of the l/d ratio and strain rate on the deformation behavior of rolled and homogeneous armor steel in the split Hopkinson pressure bar test process

Dynamic Mechanical Behavior and Numerical Simulation of Frozen Soil under Impact Loading

Numerical Analysis of a High-Velocity Projectile’s Impact on Shallow Steel Tunnels in Soft Sandstone

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