The axial crushing of thin-walled tubes has been the subject of extensive research in the past. The existing kinematic models for predicting crushing behavior of axially loaded thin-walled tubes are systematically reviewed and analyzed. The advantages and limitations of each model are discussed. A new chain link model for circular tubes and square tubes is presented and studied in detail. Unlik...

discrete element method (dem) is extensively used for mathematical modeling and simulating the behavior of discrete discs and discrete spheres in two and three dimensional space, respectively. prediction of particles flow regime, power draw and kinetic energy for a laboratory or an industrial mill is possible by dem simulation. in this article, a new approach was used to assess the main paramet...

Polyakov et al. (1995) showed errors in dose estimation as a function of grain size for enamel grains given beta irradiation after crushing. We tested the effect of gamma irradiation applied to the specimens before and after crushing. We confirmed Polyakov's observations and found that post-crushing irradiation altered the slope of the dose-response curve of the hydroxyapatite signal and produc...

Coal samples having the same diameter (50 mm) and different length-diameter ratios (l/d), i.e., 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 were tested under dynamic uniaxial impact compression using Split Hopkinson Pressure Bar (SHPB) experimental system. This study evaluates: (a) The effects of l/d on energy consumption law fractal characteristics coal crushing; (b) stress balance dissipation; (c)...

Fresh ripened Guavas were procured from entrepreneur’s field and were weighed, sorted, washed, lye peeled before crushing and sieving to get guava pulp for preparation of different products such as RTS, Nectar and guava bar. Physico-chemical properties (Total Soluble Solids (TSS) Acidity, Ascorbic acid Content (AAC), Thermal properties, Particle Size analysis) and microbial properties (bacteria...

Spherical crystallization is a novel particle engineering/design technique developed by Kawashima et al, to overcome the problems associated with direct compression. Basically, it's single step process used for size enlargement of single, two or more, small dose or large dose drugs, in combination with or without diluent. The process of spherical crystallization involves simultaneous crystalliz...

A quality-by-design (QbD) principle, including process analytical technology, is becoming the principal idea in drug development and manufacturing. The implementation of QbD into product development and manufacturing requires larger resources, both human and financial, however, large-scale production can be established in a more cost-effective manner and with improved product quality. The objec...

This paper presents a novel framework of modeling crushable granular materials under mechanical loadings based on the discrete element method (DEM). The is featured with construction one-to-one model in which every particle physical experiment has its own numerical twin and allows irregular shaped fragments during continuous breakage process. First, image processing techniques spherical harmoni...

In this experiment, the influence of coal gangue as admixture on performance dry-mixed mortar was studied, and results were analyzed by XRD SEM. The effects different ways crushing, particle size distribution, gangue, cement, admixture, water content retention, consistency, 7 d compressive strength investigated. show that optimum hammer crushing through 3 mm sieve cement is 83% 17% total mass (...

Please cite this article in press as: Ajdari, A., et a Int. J. Solids Struct. (2010), doi:10.1016/j.ijsolst The in-plane dynamic crushing of two dimensional honeycombs with both regular hexagonal and irregular arrangements was investigated using detailed finite element models. The energy absorption of honeycombs made of a linear elastic-perfectly plastic material with constant and functionally ...