Applied Impact Mechanics

Rao, C. Lakshmana; Narayanamurthy, V.; Simha, K. R. Y.

doi:10.1002/9781119241829

Cited by 37 publications

(26 citation statements)

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“…There are two methods of numerical time integration alternatives used in computational ballistics: (1) explicit, (2) implicit. The explicit time integration scheme provides solutions whatever the velocity of impact or the magnitude of the strain rates concerned [14,15]. However, implicit time integration scheme is treated less common compared to the explicit method for general impact problems [15].…”

Section: Methodsmentioning

confidence: 99%

Cylindro-Conical Mild Steel Projectile Impact on E-Glass Fiber Reinforced Laminated Composite Plate Including Delamination Analysis

Yavuz

2021

European Mechanical Science

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Computational impact analysis of an E-glass fiber reinforced laminated composite structure with a conical nose shaped projectile is performed including delamination analysis. In addition to intralaminar damage analysis, interlaminar damage analysis is considered due to the laminated configuration of the protective structure. Threat is made of mild steel projectile and it is modeled using Johnson-Cook material model with ductile damage criterion. Intralaminar and interlaminar damage modeling of target material is realized in the frame of Hashin damage criteria and quadratic nominal stress criterion with Benzeggagh-Kenane fracture criterion, respectively. Stress and damage distribution both in target and threat materials are obtained by mesh gradation analysis via Abaqus/Explicit v6.19. Effect of delamination analysis in computational impact modeling is evaluated by considering the computational cost regarding CPU time and wall clock time. Larger von Mises stresses obtained when excluding interlaminar debonding in the analysis. It is found that delamination analysis significantly improved the damage evaluation of composite laminates owing to impact loading with small computational effort.

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Section: Methodsmentioning

confidence: 99%

Cylindro-Conical Mild Steel Projectile Impact on E-Glass Fiber Reinforced Laminated Composite Plate Including Delamination Analysis

Yavuz

2021

European Mechanical Science

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“…The border conditions eq. (3b) result from the vanishing of the strain ∂ x u at the bar's ends, due to the absence of constraints [4]. From eq.…”

Section: The Thin Barmentioning

confidence: 99%

Why pushing a bell does not produce a sound

Ferrari¹

2019

American Journal of Physics

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The difference between 'beating' and 'pushing' results in the perception that a push just makes the object move as a whole, while a beat produces also a sound. Through a detailed analysis of the physics underlying such everyday experiences, we identify the strength, the duration and the softness of the applied contact force, as the main (measurable) characteristics that mark such difference. The strength determines the final velocity ∆v achieved by the body. The duration 2τ compares to the time τ the sound takes to cross the body. The softness γ (a positive exponent) results from the shape in time of the contact force. Those three elements enter the formula for the intensity of the sound produced. The relevant role of the softness is stressed and specific values are calculated for a thin metallic bar, chosen as the simplest possible model system.

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“…As a result, the authors also recommended the use of materials that melt easily to prepare an escape route for the vapor. As it is well-known that an impact generates heat (Rao et al 2016;Johnston et al 2017), the phase and pore structure of HCP may change and it is inappropriate to conduct a triaxial test to simulate the response of concrete due to impact load without considering the effect of heat.…”

Section: Introductionmentioning

confidence: 99%

Microscopic Change in Hardened Cement Paste due to High-Speed Impact

Sakai

Sikombe

Watanabe

et al. 2019

ACT

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Impact load was applied to hardened cement paste (HCP) specimens using a gas gun to investigate microscopic changes in the specimens and develop a better response model of concrete subjected to impact load. Plasma emission was observed at the moment of impact at 420 metres per second and the colour of the portion near the impact point turned brighter. This brighter portion was analysed, and it was observed that the pore structure was coarser compared to the other portion. However, the results of thermogravimetry and X-ray diffraction analysis were similar. A possible reason is that the generated heat was instantaneous and the rate of the temperature increase in the HCP decreased due to evaporation of water in the HCP. These results indicate that during impact at a few hundred metres per second, porosity increase due to heat effect is more dominant than porosity decrease due to mechanical compaction.

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Applied Impact Mechanics

Cited by 37 publications

References 0 publications

Cylindro-Conical Mild Steel Projectile Impact on E-Glass Fiber Reinforced Laminated Composite Plate Including Delamination Analysis

Cylindro-Conical Mild Steel Projectile Impact on E-Glass Fiber Reinforced Laminated Composite Plate Including Delamination Analysis

Why pushing a bell does not produce a sound

Microscopic Change in Hardened Cement Paste due to High-Speed Impact

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