Aiming at the lack of a precise discrete element model in simulation analysis corn straw crushing, this paper established bond models with different structure and particle properties based on Hertz-Mindlin bonding, verified by combining physical test optimization design methods. Firstly, study generates bonded bonding for epidermis-epidermis, inner flesh-internal flesh, epidermis-internal respe...

BACKGROUND The aim of this study was to construct an alternative classification system for occupational hand injuries based on etiologic mechanisms and to analyze the injury patterns resulting from various mechanisms. METHODS A retrospective analysis of patients operated between January 2005 and December 2007 in two hand surgery units staffed by a team of hand surgeons was made. The patient f...

Bulk gangue is a common backfill material in solid mining. After backfilling into the goaf, bulk serves as main body to bear load of overlying strata, and its deformation resistance key factor affecting quality. In this study, laterally confined compression test broken was designed, compaction characteristics specimens under different loading rates were studied, acoustic emission (AE) energy an...

in this paper, numerical simulation of frp composite cylinder tubes progressive crushing processes is conducted using ls-dyna. details on the numerical modeling strategy are given and discussed. it is found that triggers introduced in the numerical simulation can effectively model the bevel trigger at the end of the tubular specimens. it is also found that two-layer finite element model based o...

The objective of work was focused to investigate microstructure of polyurethane foam and cyclic crushing strength of its sandwich structure which made of sisal / coir / bamboo / glass fabrics as reinforcement with polyester resin to form composites skin. The tested sandwich panels were constructed four type of FRP faceplates made of sisal / coir / bamboo / glass fiber reinforcements impregnated...

In tall buildings the reinforced concrete (RC) shear wall is one of the predominant structural components used to resist lateral loads induced by earthquakes around the world. Previous research demonstrated that shear walls displayed a sudden loss in lateral capacity due to the wall corner and web crushing in the plastic zone. In addition, it was found that large shear distortions in shear wall...

The loading response of shell structures depends on their shapes. The individual shape behaves uniquely to the loading, and different shapes give different load displacement graphs. If these geometries are combined, then their load displacement graphs can be different. It may happen that their combined behavior can be harnessed to be used as better energy absorber in a controlled manner, which ...

OBJECTIVE The aim of this study was to evaluate the effects on the mechanical properties of rats' calcaneus tendons, of repair arrangements using suture material in the absence of any healing process. METHOD Twelve male Wistar rats were used. They were subjected to placement of a modified Kessler suture stitch in the calcaneus tendon. The sacrifices were performed immediately after and six we...