Abstract
The paper presents experimental investigations of the compaction process of loose material in the form of sawdust. These were compacted in the sleeve-punch assembly adapted for installation on a strength testing machine. Sawdust was compacted with a force suitable to obtain the desired compressive stress in the sample cross-section. The effect of the composition of the compacted sample was investigated by adding pine sawdust to 50% of the total sample's weight. The experimental compaction process was simulated by building its numerical model using the Drucker-Prager-Cap model. Obtained results of experimental tests carried out on a strength testing machine allowed to establish a numerical model of the sawdust compaction process in the Abaqus program and to assess the possibility of using the Drucker-Prager-Cap model for numerical simulation of compaction process of loose materials in the form of sawdust.
Highlights
The technological process of material compaction utilizing the piston technique is commonly employed in, among others, metallurgy, pharmaceutical and automotive industry [1, 2]
This study presents the examination of the biomass compaction process in form of mixed pine and oak sawdust
The Drucker-Prager-Cap model, further referred to in this study with the abbreviation DPC (Drucker-Prager-Cap), is a model suitable for simulating the behavior of granular soil materials such as sand or gravel [1, 2]. This model is implemented within the Abaqus software, and this paper presents its utilization for numerical simulation of sawdust compaction process
Summary
The technological process of material compaction utilizing the piston technique is commonly employed in, among others, metallurgy, pharmaceutical and automotive industry [1, 2]. The process of compaction utilizing the piston technique for biomass such as straw, sawdust or wood chippings obtained through fragmentation of roadside tree branches using special shredding machines became the subject of interest to numerous researchers [3]. In order to obtain a product with the required physical and chemical properties, it is necessary to identify the properties of the biomass material in order to select the desirable properties for the compaction process (temperature, compaction force, biomass moisture content, biomass fragmentation and compaction method) [8]. The factors influencing the strength and durability of the agglomerate are the type of compacted biomass material (materials), moisture content, size and distribution of particles, process temperature, additives such as binding agent and other substances together with the compaction process parameters (temperature, dimensions of the compacting die, piston head movement speed, etc.) [18, 19]. The final sections of this paper present example results from the experiment and simulation together with conclusions
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