Ductile–brittle failure of amorphous glassy polymers: A phase-field approach

Dal, Hüsnü; Gültekin, Osman; Başdemir, Selçuk; Açan, Alp Kağan

doi:10.1016/j.cma.2022.115639

Cited by 12 publications

(7 citation statements)

References 72 publications

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“…Furthermore, only visible light was transmitted through the specimen and the decrease in the transmittance values was low. [17][18][19] The ballistic test results have shown that the framed polycarbonate laminate was able to stop two bullets fired from a distance of 5 m. The test was carried out with a standard test procedure with a firing distance of 5 mm and the transparent poly carbonate laminate was fixed on wall with a back rubber cushion. Apparently, gap between the two fired bullets was 60 mm.…”

Section: Discussionmentioning

confidence: 99%

“…Looking over the plot, we can observe that the UV rays were almost completely absorbed, making the material that can be used as a protection from UV rays. Furthermore, only visible light was transmitted through the specimen and the decrease in the transmittance values was low 17–19 …”

Section: Discussionmentioning

confidence: 99%

“…Caution must be taken while using the solvent, and proper ventilation and protective measures must be taken to prevent exposure from the solvents and solvent vapors. If not properly handled, there could be emission of hazardous gases and that may result risk for human health 17,18 …”

Section: Mechanism Of Solvent Vapor Bondingmentioning

confidence: 99%

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Development of light weight transparent bullet proof polymeric laminates

Kumar,

Pothuraju,

Lakshmi

et al. 2023

Polymer Engineering & Sci

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Armed vehicles, improvised explosive device blast‐proof vehicles, require their windshields and windows to be transparent and yet be resistant to high‐velocity impact of splinters. Hence, composite which is of ballistic grade and yet transparent is in real need for all these applications. This study is dedicated to finding a practical solution for using transparent polycarbonate (PC) laminate made using solvent vapor bonding for ballistic applications. The solvent that was proved to be best for solvent vapor bonding of polycarbonate sheets was dichloromethane, as the bond strength was observed to be high from the results of lap shear tensile test. The transparency retention is reasonably high when solvent vapor bonding was used and the toughness has increased near to 50% in comparison with nonlaminated PC. In this study, a polycarbonate laminate with dimensions 150 × 150 × 40 mm made using solvent vapor bonding and is tested with two 9‐mm bullets fired with velocity of 430 m/s from a distance of 5 m. The laminae successfully stopped both the bullets without any back face signature and there was no brittle failure as such, rather delamination happened at interface of laminae since it has essentially absorbed the impact energy of bullet.Highlights Solvent vapor bonding of polycarbonate laminate. Transparent ballistic shield with layer of polycarbonate laminate. Enhancement of mechanical properties of solvent‐vaporized bonding polycarbonate laminate. Ballistic testing of transparent polycarbonate laminate.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Development of light weight transparent bullet proof polymeric laminates

Kumar,

Pothuraju,

Lakshmi

et al. 2023

Polymer Engineering & Sci

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“…We refer the interested readers to DAL ET AL. [8] for detailed explanation accounting shear yielding, crazing, and void volume fraction evolutions.…”

Section: Void Volume Fractionmentioning

confidence: 99%

“…5, see DAL ET AL. [8]. Since ᾱ controls the damage initiation in terms of equivalent plastic strain according to (13), increasing the ᾱ value delays the crack initiation and results in relatively ductile failure.…”

Section: Representative Numerical Examplesmentioning

confidence: 99%

Coupled thermo‐viscoplastic fracture model for ductile‐brittle failure of amorphous glassy polymers with phase‐field approach

Başdemir

Gültekin

Dal

2023

Proc Appl Math and Mech

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Amorphous glassy polymers have an extensive use in the industrial sectors including micro-electronics, medical industry and aerospace, therefore their design and usage have become a significant task nowadays. The fracture response of these polymers may vary from ductile to brittle depending on several factors such as entanglement density, temperature level and external loading rate. The ductile response is driven by diffuse shear zones exhibiting volume-preserving inelastic deformations while the brittle response is manifested by very small crack-like defects composed of a sequence of fibrillar bridges separated by micro-voids, thereby connotating void formation consisting of nucleation and propagation steps. The presents study is focused on the description of shear yielding and crazing phenomenon in terms of their respective evolution equations. In addition, an extension towards the modelling of the fracture is employed via the crack phase-field approach, considering ductile and brittle failure simultaneously. This is provided by the novel failure criterion that features a critical amount of plastic strain and void volume fraction. Since the proposed approach unitedly models the macroscopic crack initiation and propagation for ductile or brittle failure, it is asserted to be more physically grounded compared to present models in the literature. Constitutive formulations for shear yielding, crazing, and void volume fraction are derived with their specific forms starting with the local and conductive component of the dissipation inequality. The performance of model is evaluated after developing the local and global Newton-type update algorithms for the dissipative internal and primary field variables, respectively and it has been analysed by fitting of several experimental data of homogeneous and inhomogeneous tests. The findings reveal the remarkable temperature dependency on the type of failure as well as the interaction between loading rate and temperature change owing to dissipative heating in the solid.

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Phase-Field Modeling of Fatigue Crack Propagation in Brittle Materials

Aldakheel

Schreiber

Müller

et al. 2022

Current Trends and Open Problems in Computational Mechanics

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The phase field method has gathered significant attention in the past decade due to its versatile applications in engineering contexts, including fatigue crack propagation modeling. Particularly, the phase field cohesive zone method (PF-CZM) has emerged as a promising approach for modeling fracture behavior in quasi-brittle materials, such as concrete. The present contribution expands the applicability of the PF-CZM to include the modeling of fatigue-induced crack propagation. This study critically examines the validity of the extended PF-CZM approach by evaluating its performance across various fatigue behaviours, encompassing hysteretic behavior, S-N curves, fatigue creep curves, and the Paris law. The experimental investigations and validation span a diverse spectrum of loading scenarios, encompassing pre-and post-peak cyclic loading, as well as low-and high-cyclic fatigue loading. The validation process incorporates 2D and 3D boundary value problems, considering mode I and mixed-modes fatigue crack propagation. The results obtained from this study show a wide range of validity, underscoring the remarkable potential of the proposed PF-CZM approach to accurately capture the propagation of fatigue cracks in concrete-like materials. Furthermore, the paper outlines recommendations to improve the predictive capabilities of the model concerning key fatigue characteristics.

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Ductile–brittle failure of amorphous glassy polymers: A phase-field approach

Cited by 12 publications

References 72 publications

Development of light weight transparent bullet proof polymeric laminates

Development of light weight transparent bullet proof polymeric laminates

Coupled thermo‐viscoplastic fracture model for ductile‐brittle failure of amorphous glassy polymers with phase‐field approach

Phase-Field Modeling of Fatigue Crack Propagation in Brittle Materials

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