For example, Zheng et al. (2014) reported the quasi-static and dynamic initial crushing stresses of cellular materials are different due to different deformation mechanisms, but Barnes et al. (2014) regarded that the stress ahead of the shock front is at the same level as the first local stress maximum of the quasi-static stress-strain curve ...
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The main conclusions are: (1) the strain-rate sensitivity of cellular materials is closely associated with base material properties (both quasi-static and dynamic ones) and cell structure; (2) the compaction shock in cellular materials has mesoscopic structural causes and its formation leads to unique deformation mode, load transmission and ...
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The main phenomena are as follows: (i) a propagating discontinuity separating the crushed and uncrushed regions remarkably exists when the impact velocity is larger than a critical value; (ii) the stress of the impinging end is enhanced comparing to the quasi-static plateau stress. ... Dynamic crushing of cellular materials: A unique dynamic ...
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Particle crushing underpins important macroscopic behaviour of granular materials such as yielding, deformation, dilatancy, failure, mobility and packing features. The crushing condition …
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Granular crushing is a common phenomenon in a series of engineering problems involving high-stress levels, such as high rockfill dams, pile foundation penetration into soils, and the comminution of particles in roller mills (Zhang et al., 2016, Zhang et al., 2013, Guo and Chen, 2022, Zhou et al., 2019).Therefore, gradation evolution induced by crushing is a crucial issue …
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Understanding the correlation between particle breakage and its mechanical response of these materials is crucial for construction and hazard assessment. ... particle size obtained from sieving before and after crushing. This quantification can be classified into two major categories, i.e., the single-particle-size breakage index, which ...
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The crushing phenomenon can also be accelerated by the humidity evolution inside the material (Oldecop and Alonso, 2001). As an example it is the expanded clay (looks like expanded perlite), which is used in many applications because of its lower density.
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For very low slenderness ratios the strength of the material will be exceeded before the buckling limit is reached. This means we can define two distinct regions, one where columns fail by crushing because the stress in the column exceeds the material yield strength (i.e. for stocky columns), and one where they fail due to buckling (i.e. for ...
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Granular crushing is a detrimental phenomenon that deserves to be sudied in order to understand its causes, consequences, and ways to avoid it. Laboratory tests conducted on a weak granular material (sugar) and computer simulations (in the form of the Discrete Element Method, DEM) were usedto visualize, analyze, and understand the evolution of ...
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Dynamic crushing of cellular materials: A unique dynamic stress–strain state curve. Author links open overlay panel Yuanyuan Ding a, Wang Shilong a, Zheng Zhijun a, Yang b, Jilin Yu a. ... This phenomenon is probably due to the decreasing velocity ahead of the plastic wave in the specimen. At last, the stress decreases from the ...
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However, the majority of previous studies on cement-stabilized recycled aggregate materials overlooked the roles of crushing recycled aggregate particles and the ITZ damage in controlling the overall strength ... the NG-70 %+RB-30 % specimens exhibited a more severe particle crushing phenomenon, shorter crack expansion paths, and even localized ...
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There has been significant work on modeling of particle crushing using the replacement technique. Various advanced failure criteria are proposed to obtain realistic particle crushing (Ben-Nun and ...
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MATERIALS AND TEST -the title of this part should be "materials and methods" ... This paper describes selective crushing phenomenon of gangue in jaw crushing process. This is a fundamental knowledge of coal treatment, and result appear to be reasonable. However, discussions are not always clear. In addition, conclusion is not clear whether ...
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The crushing phenomenon of a solid material is essentially dependent on the structure-sensitive defects such as microcracks. It is also accompanied essentially by nonlinear, irreversible and irrecoverable process. Furthermore, this is the initiation of microcracks, growth and propagation of fracture cracks, which are strongly influenced by ...
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Stone fill materials are widely used in engineering projects such as earth-rock dams, railways, and highway embankments. Nevertheless, they are susceptible to particle breakage, which can lead to a decline in engineering performance. A complete set of studies on crushed stone aggregates was carried out to investigate particle crushing characteristics under various …
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This helps to acquire new knowledge of crushing phenomena and improve the efficiency of crushing of various materials [73,74,75]. Improper selection of the type of crushing equipment, its size, and its mode of operation for a given material can result in high energy consumption, poorer product quality, increased undesirable fractions, and ...
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In order to understand the fundamental behaviour of crushable materials with fines removal in wide stress range, a numerical investigation was conducted. The investigation was carried out …
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In this work, an experimental setup for active impact crushing is designed and constructed to investigate the crushing behavior of particles in a VSI crusher.
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Cellular material under high-velocity impact exhibits a typical feature of layerwise collapse. A cell-based finite element model is employed herein to simulate the direct impact of a closed-cell , and one-dimensional velocity field distributions are obtained to characterize the crushing band propagating through a cellular material. An explicit expression for the …
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Crushable granular materials are frequently handled in multiple fields across geotechnical engineering, mining industry, food and pharmaceutical industry, and chemical industry. Grain crushing in granular media presents an important micro-mechanical origin to many macro-mechanical behaviors of granular materials, including packing, strength, dilatancy, …
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Particle breakage is a phenomenon that occurs when particles of coarse-grained materials (CGMs) are exposed to considerable stress or shear strain, followed by breakage into smaller-sized particles. ... Fractal crushing of granular materials under confined compression at different strain rates. Int J Impact Eng, 106 (2017), pp. 259-265, 10.1016 ...
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Selective Crushing Phenomenon of Gangue during the Jaw Crushing Process. Sustainability 2022, 14, 12395. ... [15] studied the mechanical behavior of gangue filling materials in depth. Through the ...
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The crushing phenomenon of the pGFRP profiles was investigated regarding the following aspects: (i) ... This may be attributed to the influence of cross-section geometry on material crushing behaviour, including different strain behaviour for different cross-sections, and also differences in fibre-architecture, wall thickness, weaker wall ...
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Because particle crushing is a time-dependent phenomenon described as static fatigue or delayed fracture, the close relation between time effects and crushing in granular materials is established ...
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However, most of the above studies regard coarse aggregate as rigid and ignore the crushing phenomena of coarse aggregate under external loads. This differs slightly from the real test results. For granular materials, particle breakage occurs when the compression stress exerted on a particle surpasses its strength.
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Particle morphology is critical in affecting the crushing behavior of rockfill materials. In contrast, most current single particle simulations lack satisfactory morphology accuracy, and …
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most materials. For granular materials the effects of strain rate or loading rate are observed to be small to negligible, and while creep and stress relaxation are caused by the same phenomenon, namely grain crushing followed by grain rear-rangement, the prediction of one phenomenon can apparently not be accomplished on the basis of the other.
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Particle crushing underpins important macroscopic behaviour of granular materials such as yielding, deformation, dilatancy, failure, mobility and packing features. The crushing condition and crushing ... is capable of simulating a single sand particle crushing phenomenon. The simulations offer insights into the crush-ing behaviour of single ...
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Semantic Scholar extracted view of "CRUSHING PHENOMENA IN GRANULAR SOILS" by T. Ramamurthy. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 216,508,622 papers from all fields of science. Search. Sign In Create Free Account.
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The materials quarried from upstream of Kol Dam as a suitable source consist of lime particles of 600 mm in size (max.) and are sedimentary by chemical precipitation. They have small tissues and give effervescence with dilute HCl, and are grey in color and fine grained. ... Crushing phenomena in granular soils. Journal of Indian National ...
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