Effect of heterogeneity on crushing failure of disordered staggered-square honeycombs

Kumar, Deepak; Banerjee, Anuradha

doi:10.1016/j.compstruct.2020.112055

Cited by 10 publications

(8 citation statements)

References 50 publications

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Section: Random Spring Network Modelmentioning

confidence: 99%

“…For each spring, the onset of nonlinearity was taken to occur when the strain in the spring exceeded the yield strain, εy. The secant modulus Esm (figure 2) was evaluated as per the power-law hardening expression reported in Kumar & Banerjee [34]: Esmfalse(εfalse)={E0,false0if ε≤εy,E0(εεy)n−1,false0if ε≥εy,where n is the strain hardening exponent (n=1 corresponds to no hardening). To account for possible unloading, the modulus E associated with the spring is updated as Efalse(εnewfalse)=trueprefixminfalse[Esmfalse(εnewfalse),Efalse(εoldfalse)false],where εold denotes the current strain, and …”

Section: Random Spring Network Modelmentioning

confidence: 99%

“…The numerical values of the different parameters used in the simulations are given in table 1. These values are representative of the glassy polymer that we use as a prototype for quasi-brittle material [34]. The hardening exponent n and disorder in εf take on different values in the simulations.…”

Section: Random Spring Network Modelmentioning

confidence: 99%

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Interplay between disorder and hardening during tensile fracture of a quasi-brittle solid

2022

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We examine the specific role of the interplay between hardening and disorder characteristics of a representative quasi-brittle material on its failure mechanisms using a random spring network model. The model incorporates quasi-brittleness in its spring constants and disorder in the failure strain threshold and is shown to be effective in simulating the experimentally observed tensile and fracture behaviour of a quasi-brittle epoxy resin-based polymer. It is shown that rapid localization of deformation and associated damage growth occurs for a weakly hardening solid while for a linear elastic material, damage nucleates at multiple independent sites, and there is significant growth of damage, independent of other nucleating sites, prior to maximum load. The failure mechanism is shown to crossover from an avalanche-dominated fracture for a linear elastic material to nucleation-dominated fracture for a weakly hardening material.

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Section: Random Spring Network Modelmentioning

confidence: 99%

Section: Random Spring Network Modelmentioning

confidence: 99%

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Interplay between disorder and hardening during tensile fracture of a quasi-brittle solid

2022

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“…On the contrary, systematic studies of the failure mechanisms of − walled/surface/plate/sheet-based AM structures are rare; an observation also reported in a comprehensive review by Zadpoor [72] on biomedical application. However, additively manufactured honeycomb structures exhibiting + under the influence of in-plane compression have been extensively studied [158][159][160][161][162][163]. To further study the failure behaviour at both the micro and macro-scales, the failed samples were investigated under an SEM as shown in Fig.…”

Section: Failure Mode Analysismentioning

confidence: 99%

Additively manufactured AlSi10Mg inherently stable thin and thick-walled lattice with negative Poisson’s ratio

Arjunan

Singh

Baroutaji

et al. 2020

Composite Structures

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“…A number of studies have been reported recently on the mechanical performance of FRPCbased honeycombs as well as on sandwich structures based on these composite honeycombs. [12][13][14][15][16][17][18][19][20][21][22][23] Many of these studies have focused on honeycombs manufactured using thermosetting polymers. Thermosetting polymers, such as epoxy resins, are widely used matrix systems in FRP composites due to their superior mechanical and thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Energy absorption in carbon fiber honeycomb structures manufactured using a liquid thermoplastic resin

Khan¹,

Aziz

Irfan

et al. 2022

Journal of Composite Materials

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In this study, carbon fiber/thermoplastic (Elium®) honeycombs were manufactured using the resin infusion process in a customized metallic mold. Honeycomb cores, based on different carbon fiber layers, were manufactured to achieve four different fiber weight fraction composites. Two different types of specimens, based on a single honeycomb cell and five honeycomb cells, were prepared and subjected to compression loading. The results of these tests were compared with data from similar honeycomb structures based on carbon fiber–reinforced epoxy composite. It has been shown that the compressive strength and the specific energy absorption capacity of the honeycombs increase rapidly with increasing fiber weight fraction. The specific energy absorption capability of the novel thermoplastic honeycomb structures has been shown to be as high as 50 kJ/kg which compares favorably with other energy-absorbing core materials. The thermoplastic honeycomb specimens exhibited a similar specific energy absorption capability and an improved compressive strength compared to their epoxy counterparts. Furthermore, the CF/thermoplastic honeycombs exhibited enhanced structural stability and displayed a more uniform and progressive core failure mode than the longitudinal splitting observed in the CF/epoxy honeycombs. The honeycomb core that exhibited the best performance was then used to manufacture thermoplastic sandwich specimens based on CF/thermoplastic face sheets. Three point bend tests were conducted to determine the flexural strength of the sandwich samples and to identify the failure modes. Optical micrographs revealed that the flexural damage was primarily due to the core crushing and adhesive failure between the core and the composite skins.

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Effect of heterogeneity on crushing failure of disordered staggered-square honeycombs

Cited by 10 publications

References 50 publications

Interplay between disorder and hardening during tensile fracture of a quasi-brittle solid

Interplay between disorder and hardening during tensile fracture of a quasi-brittle solid

Additively manufactured AlSi10Mg inherently stable thin and thick-walled lattice with negative Poisson’s ratio

Energy absorption in carbon fiber honeycomb structures manufactured using a liquid thermoplastic resin

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