crushing of low density foams under triaxial loadings

Crushing of low density foams under triaxial loadings

A micromechanically accurate Al-alloy foam model of relative density of 0.08 is crushed under displacement controlled axial compression at different levels of external pressure–triaxial loading. For all pressure levels the foam initial stiff elastic response terminates into a load maximum triggering localized crushing in a band of cells.

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On the multiaxial crushing of low-density open-cell foams

The present study investigates how this partially unstable behavior of low-density foams transfers to the multiaxial setting as follows: (i) The crushing behavior of random foams is investigated under "true" triaxial loadings. A micromechanically accurate cubical ...

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Low-density foams

Low-density, highly compressible elastomeric foams are widely used in the automotive industry as energy absorbing materials. Foam padding is used in many passive safety systems, such as behind headliners for head impact protection, in door trims for pelvis and thorax protection, etc. Energy absorbing foams are also commonly used in packaging of ...

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Continuum modeling of crushing of low density foams

 · Under compression deformation in low-density foams localizes into narrow bands of crushed cells. Crushing spreads at nearly constant stress with crush…

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On the multiaxial crushing of low-density open-cell foams

dc ntributor.advisor Kyriakides, S. dc.creator Yang, Chenglin, Ph. D. dc.date.accessioned 2020-10-07T22:02:10Z dc.date.available 2020-10-07T22:02:10Z dc.date ...

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Low density foams

Abstract: Silicone flexible foams of good fire-resistance and extremely low density from about 5 to 14 lbs/ft. 3, having good mechanical and physical properties, are provided. The curable and foamable compositions are prepared from a multi-component mixture comprising, as part A, a high molecular weight uncured vinyl-terminated siloxane polymer ...

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A Directional Crack Damage Memory Effect in Sandstone Under True Triaxial Loading …

 · Crack damage leading to failure in rocks can be accumulated through cyclic stressing in the crust. However, the vast majority of experimental studies to investigate cyclic stressing apply conventional triaxial stress states (σ 1 > σ 2 = σ 3), while in nature the state of stress in the crust is generally truly triaxial (σ 1 > σ 2 > σ 3).

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The Response of Aluminium Foams Under Quasi-Static Loading

For example, the loading condition. The densities of foams predicted crushing stress, σ∗pl for foam density, were varied from 175 kg/m3 to 429 kg/m3. ρ∗ of 406 kg/m3 was 6.7 MPa, which was Figure 5 (a) and figure 5 (b) show the vertical less

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Crushing Behavior and Crushing Strengths of Low-Density Foam …

 · Under compression, the foam structure gets progressively crushed at a steady stress stage such that a substantial amount of energy is dissipated. Understanding foam concrete crushing behavior is of special importance for its engineering applications such as energy absorber, but the current studies are insufficient to define material properties for design of field …

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Experimental and numerical investigation of the mechanical behaviour of an open-cell ceramic foam under multiaxial loadings

powders allowing to explore more complex triaxial loading paths and for very large strains [7][8]. In this research, the mechanical response of low density OCCF has been characterized at room temperature under uniaxial and multiaxial loadings and notably itsfied.

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Crushing Behavior and Crushing Strengths of Low-Density Foam …

 · Under compression, the microstructure of low-density foam concrete gets progressively crushed at a steady stress stage, accompanied by substantial energy dissipation. Understanding foam concrete crushing behavior is of special importance for its engineering applications. However, the current studies are insufficient to define key attributes ...

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Crushing of low density foams under triaxial loadings

Abstract A micromechanically accurate Al-alloy foam model of relative density of 0.08 is crushed under displacement controlled axial compression at different levels of external pressure–triaxial loading. For all pressure levels the foam initial stiff elastic response terminates into a load maximum triggering localized crushing in a band of cells. Under further compression the …

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A Directional Crack Damage Memory Effect in Sandstone Under True Triaxial Loading …

 · (a) Sequential conventional triaxial loading where σ zz is first raised to 80 MPa and unloaded, followed in sequence by an identical loading pattern in the σ xx and σ yy directions. Cumulative AE is denoted by a black line, and the onset of AE observed in each cycle is denoted by a black ellipse.

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Crushing of low density foams under triaxial loadings

 · In a true triaxial loading numerical apparatus was used to study in detail the crushing behavior of low-density foams at the multiaxial setting. The present paper presents a complementary study of crushing of the same foams under the more conventional triaxial loading that examines the behavior under different stress histories.

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Mechanical behavior and failure criterion of the gangue-based haydite concrete under triaxial loading …

 · Triaxial loading tests were carried out on the gangue-based haydite concrete cube specimens (100 × 100 × 100 mm3) and plate specimens (100 × 100 × 50 mm3) to investigate the mechanical Experimental results revealed that, under triaxial compression loading, most of the haydites within the specimen were crushed when the stress ratios σ 1/ σ 3 ≥ 0.3 …

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Cyclic loading of railway ballast under triaxial conditions and …

 · A recently developed large-scale triaxial test apparatus for railway ballast testing comprises a double-cell arrangement for measuring volume change by differential pressure. Monotonic and cyclic tests were performed on limestone ballast samples. Axial and volumetric strains and breakage were determined from both types of test. Resilient modulus and …

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Continuum modeling of crushing of low density foams

 · Cubical random isotropic Al-alloy open-cell foams of relative density of 8% were produced from skeletal models generated via the Surface Evolver software as reported in our previous works on the subject (Gaitanaros et al., 2012, Gaitanaros and Kyriakides, 2015, 2018). 10 3 cell models were crushed using the true triaxial numerical crushing apparatus (Pearce, …

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Low density foams

Good foam stability at low density. Fire performance. According to DIN 4102: B3. Blowing agents. Carbon dioxide. Density [kg/m3] 8 - 16. Product group. Polyurethane rigid foam, low …

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Mechanical Behavior of Polyurethane Polymer Materials under Triaxial Cyclic Loading…

 · Polyurethane polymer grouting materials were studied with conventional triaxial tests via the particle flow code in two dimensions (PFC2D) method, and the simulation results agreed with the experimental data. The particle flow code method can simulate the mechanical properties of the polymer. The triaxial cyclic loading tests of the polymer material under different …

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Effects of Meso Shape Irregularity of Metal Foam on Yield Features under Triaxial Loading …

 · The yield surface of each 3D Voronoi foam under triaxial loading was calculated, and the influence of shape irregularity on the yield surface was investigated. The results show that the yield surface in (σ e, σ m ) space may be depicted by an ellipse for metallic foams with different shape irregularities.

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Free Full-Text | Mesoscale Modelling of Concretes Subjected to Triaxial Loadings: Mechanical Properties and Fracture Behaviour …

The mechanical properties and fracture behaviour of concretes under different triaxial stress states were investigated based on a 3D mesoscale model. The quasistatic triaxial loadings, namely, compression–compression–compression (C–C–C), compression–tension–tension (C–T–T) and compression–compression–tension (C–C–T), were simulated using an implicit …

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Continuum modeling of crushing of low density foams

Download Citation | Continuum modeling of crushing of low density foams | Under compression deformation in low-density foams localizes into narrow bands of crushed cells. Crushing spreads at ...

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Crushing of low density foams under triaxial loadings

A micromechanically accurate Al-alloy foam model of relative density of 0.08 is crushed under displacement controlled axial compression at different l…

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Failure Criterion of Ordinary Concrete Subjected to Triaxial Compression of Full Section and Local Loadings | Journal of Materials in Civil ...

Because of the confining pressure, as for full section loading, the peak stresses under multiaxial compression were 1.27–2.27 times higher than those under uniaxial compression, whereas for local loading, the multiple was 1.24–2.05 times.

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Multiaxial crushing of open-cell foams | Semantic Scholar

Abstract The paper investigates the crushing behavior of low-density foams under triaxial loadings. A micromechanically accurate cubical model of an Al-alloy random open-cell foam is surrounded by three pairs of orthogonal rigid planes and crushed simultaneously in three directions. The foams are crushed along radial displacement paths to volume changes of …

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Chenglin Yang''s research works

Chenglin Yang''s 3 research works with 17 citations and 51 reads, including: Crushing of low density foams under triaxial loadings This page lists …

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Stelios Kyriakides''s research works

Stelios Kyriakides''s 3 research works with 15 citations and 43 reads, including: Crushing of low density foams under triaxial loadings This page lists the scientific contributions of an author ...

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Analytical and Numerical Study of Crushing of Syntactic Foams Under …

 · In this research, the quasi-static crushing behavior of syntactic foam under uniaxial compression is investigated using analytical and numerical methods. To better understand the bulk behavior of syntactic foam, a micromechanical study is conducted to analyze the crushing of hollow spheres in dilute concentration.

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Continuum modeling of crushing of low density foams

Under compression deformation in low-density foams localizes into narrow bands of crushed cells. Crushing spreads at nearly constant stress with crushed and relatively undeformed material coexisting. The material returns to homogeneous deformation with increasing stress when the crushing has spread over the whole specimen. This paper presents a first attempt …

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Dynamic crushing behavior of closed-cell aluminum foams based on different space-filling unit cells …

 · To obtain the behavior of closed-cell aluminum foam under low velocity impact loading, drop-weight impact test device was used. The main components of the device included vertically guided drop weight, fixed base plate, impactor release system, accelerometer, data acquisition device, and impactor height control system (Fig. 2 b).

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Continuum modeling of crushing of low density foams

Abstract Under compression deformation in low-density foams localizes into narrow bands of crushed cells. Crushing spreads at nearly constant stress with crushed and relatively undeformed material coexisting. The material returns to homogeneous deformation with increasing stress when the crushing has spread over the whole specimen. This paper …

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‪Chenglin Yang‬

Crushing of low density foams under triaxial loadings C Yang, S Kyriakides Extreme Mechanics Letters, 100620, 2019 2019 The system can''t perform the operation now. Try again later. Articles 1–3 ...

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Crushing performance of auxetic tubes under quasi-static and impact loading …

 · Considering energy absorption of tubes on quasi-static state equal to the "1/2mv^2" equation the approximate incident velocity derived, with "v = √2gh" equation the height of falling weight is derived. In this study, the upper platen''s height …

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