Scaling for the inverse thickness dependence of specific penetration energy in polymer thin film impact tests

Zhu, Yuwen; Giuntoli, Andrea; Hansoge, Nitin K.; Lin, Zhongqin; Keten, Sinan

doi:10.1016/j.jmps.2022.104808

Cited by 8 publications

(12 citation statements)

References 53 publications

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“…The specific penetration energy, E p * = ( v i 2 – v r 2 )/ m plug , defined as the kinetic energy loss normalized by the mass of the plug of film ejected by the projectile strike ( m plug ), is reported as a measure of the puncture resistance of the material . However, measuring m plug is nontrivial; it is usually approximated, making E p * less accurate in comparing the puncture resistance of thin films . Here we propose an alternative parameter to relate better the film’s energy dissipated to its properties.…”

Section: Resultsmentioning

confidence: 99%

“…7 However, measuring m plug is nontrivial; it is usually approximated, making E p * less accurate in comparing the puncture resistance of thin films. 8 Here we propose an alternative parameter to relate better the film's energy dissipated to its properties.…”

Section: Resultsmentioning

confidence: 99%

“…To define Π 1 , we choose v i , l p , ρ t as the 3 repeating variables and δ t as the dependent variable (6) with the power law coefficients, α = 0, β = − 1, γ = 0. Therefore, eq 6 becomes, (7) To define Π 2 , v, l p , ρ t are the 3 repeating variables and ρ p is the dependent variable (8) with power law coefficients, α = 0, β = 0, γ = − 1.Eq 8 becomes (9) Buckingham Π Theorem relates the Π as (10) Eq 10 indicates that the penetration depth should scale with the ratio of the densities. Buckingham Π analysis does not explicitly define the exponent m, merely that one dimensionless group (Π 1 ) is related to another one (Π 2 ).…”

Section: Laser-induced Projectile Impact Test (Lipit)mentioning

confidence: 99%

See 2 more Smart Citations

The Projectile Perforation Resistance of Materials: Scaling the Impact Resistance of Thin Films to Macroscale Materials

Evans

Chen

Souna

et al. 2023

ACS Appl. Mater. Interfaces

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From drug delivery to ballistic impact, the ability to control or mitigate the puncture of a fast-moving projectile through a material is critical. While puncture is a common occurrence, which can span many orders of magnitude in the size, speed, and energy of the projectile, there remains a need to connect our understanding of the perforation resistance of materials at the nano-and microscale to the actual behavior at the macroscale that is relevant for engineering applications. In this article, we address this challenge by combining a new dimensional analysis scheme with experimental data from micro-and macroscale impact tests to develop a relationship that connects the size-scale effects and materials properties during high-speed puncture events. By relating the minimum perforation velocity to fundamental material properties and geometric test conditions, we provide new insights and establish an alternative methodology for evaluating the performance of materials that is independent of the impact energy or the specific projectile puncture experiment type. Finally, we demonstrate the utility of this approach by assessing the relevance of novel materials, such as nanocomposites and graphene for real-world impact applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Laser-induced Projectile Impact Test (Lipit)mentioning

confidence: 99%

See 1 more Smart Citation

The Projectile Perforation Resistance of Materials: Scaling the Impact Resistance of Thin Films to Macroscale Materials

Evans

Chen

Souna

et al. 2023

ACS Appl. Mater. Interfaces

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“…, where τ 1−2 is the time at which the bottom surface of the film starts deforming, 28 and R p is the projectile's radius. The initial velocity of the projectile is v⃗ p = −5zσ/τ, roughly mapped to a velocity of 500 m/s, comparable to the experimental projectiles velocity 7,24 in LIPIT experiments.…”

mentioning

confidence: 99%

“…Time t = 0 is the time at which the velocity of the projectile starts decreasing shown by the first snapshot in the inset of Figure a. We compute the specific penetration energy E p * into two steps, as shown to be relevant in our previous work …”

mentioning

confidence: 99%

Bidispersity Improves the Toughness and Impact Resistance of Star-Polymer Thin Films

Gürel,

Keten,

Giuntoli

2024

ACS Macro Lett.

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Branched polymer architectures are used to tune the mechanical properties of impact-resistant thin films through parameters, such as chain length and grafting density. While chain dispersity affects molecular properties, such as interpenetration and entanglements, structure−property relationships accounting for dispersity are challenging to obtain experimentally and are often neglected in computational models. We employ molecular dynamics simulations to model the high-rate tensile elongation and nanoballistic impact of thin films composed of bidisperse star polymers with varying arm lengths. We find that, at fixed molecular weight, high dispersity can significantly enhance the toughness and impact resistance of the films without decreasing their elastic modulus. Bidisperse stars with fewer longer arms are less entangled, but stretch and interpenetrate for longer times during crazing, leading to increased toughness. These findings highlight controlled dispersity as a design strategy to improve the mechanical properties of polymer composites across Pareto fronts.

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Analysis of Impact Properties of Nanocomposites at Micron Scale

Yan,

2024

Lecture Notes in Electrical Engineering

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Scaling for the inverse thickness dependence of specific penetration energy in polymer thin film impact tests

Cited by 8 publications

References 53 publications

The Projectile Perforation Resistance of Materials: Scaling the Impact Resistance of Thin Films to Macroscale Materials

The Projectile Perforation Resistance of Materials: Scaling the Impact Resistance of Thin Films to Macroscale Materials

Bidispersity Improves the Toughness and Impact Resistance of Star-Polymer Thin Films

Analysis of Impact Properties of Nanocomposites at Micron Scale

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