In this study,a recently developed peridynamic lattice model called the“Statebased Peridynamic Lattice Model”(SPLM)is improved and demonstrated.In the SPLM,rather than as a continuum,solids are simulated using a clo...In this study,a recently developed peridynamic lattice model called the“Statebased Peridynamic Lattice Model”(SPLM)is improved and demonstrated.In the SPLM,rather than as a continuum,solids are simulated using a close-packed lattice of peridynamically interacting particles.The new SPLM approach advances the SPLM model by improving the damage and plasticity models.Elasticity,plasticity and damage are coupled in this approach.A robust method for damage initiation is developed.A new damage model called the“two-spring damage model”allows damage to localize to a single lattice particle,thus allowing highly localized damage(cracks)to emerge in a realistic manner.A plasticity model that includes hardening,softening,and damage due to plasticity is proposed and demonstrated.Peridynamic boundary effects are modeled efficiently and reasonably.The improved SPLM method is then employed to simulate three common concrete laboratory tests:uniaxial tension,uniaxial compression,and the Brazilian split cylinder test.The SPLM results are then compared with results from the earlier SPLM model,with simplified classical predictions,and with laboratory results.By solving the same benchmark problems using various lattice rotations and lattice spacings,the approach is demonstrated to be sufficiently objective to be a useful engineering tool to predict the essentially random behavior of concrete laboratory specimens.The improved SPLM demonstrates significant improvements over the previously published version and is found to simulate concrete structures accurately and efficiently using far less computational effort than comparable computational simulation methods.展开更多
This study presents the methodology to eliminate oil residual in copper pipe due to rolling process for manufacturing coil used in air conditioner. The pressure caused by Nitrogen flow rate was applied starting from 0...This study presents the methodology to eliminate oil residual in copper pipe due to rolling process for manufacturing coil used in air conditioner. The pressure caused by Nitrogen flow rate was applied starting from 0, 5, 10, and 15 bar, respectively which was depending on time delay and pipe length. The developed system was divided into 2 modules: Parallel pressure ladder module (PPLM) [1] and Serial pressure ladder module (SPLM) which were experimented with 2 sizes of copper pipe: diameter 7.29 mm, thickness 0.25 mm, and length 10 km, and diameter 8 mm, thickness 0.25 mm, and length 10 km. From experiment, it can be noted that PPLM would perform better in elimination of oil residual compared to SPLM. About 97.44% (0.04 mg/m) and 97.59% (0.05 mg/m) of oil residual can be respectively eliminated from diameter 7.29 mm pipe and diameter 8 mm pipe which exceeded the standard allowance of 30% or 0.1 mg/m. Moreover, the cost of Nitrogen can be reduced by 6.25% per month.展开更多
文摘In this study,a recently developed peridynamic lattice model called the“Statebased Peridynamic Lattice Model”(SPLM)is improved and demonstrated.In the SPLM,rather than as a continuum,solids are simulated using a close-packed lattice of peridynamically interacting particles.The new SPLM approach advances the SPLM model by improving the damage and plasticity models.Elasticity,plasticity and damage are coupled in this approach.A robust method for damage initiation is developed.A new damage model called the“two-spring damage model”allows damage to localize to a single lattice particle,thus allowing highly localized damage(cracks)to emerge in a realistic manner.A plasticity model that includes hardening,softening,and damage due to plasticity is proposed and demonstrated.Peridynamic boundary effects are modeled efficiently and reasonably.The improved SPLM method is then employed to simulate three common concrete laboratory tests:uniaxial tension,uniaxial compression,and the Brazilian split cylinder test.The SPLM results are then compared with results from the earlier SPLM model,with simplified classical predictions,and with laboratory results.By solving the same benchmark problems using various lattice rotations and lattice spacings,the approach is demonstrated to be sufficiently objective to be a useful engineering tool to predict the essentially random behavior of concrete laboratory specimens.The improved SPLM demonstrates significant improvements over the previously published version and is found to simulate concrete structures accurately and efficiently using far less computational effort than comparable computational simulation methods.
文摘This study presents the methodology to eliminate oil residual in copper pipe due to rolling process for manufacturing coil used in air conditioner. The pressure caused by Nitrogen flow rate was applied starting from 0, 5, 10, and 15 bar, respectively which was depending on time delay and pipe length. The developed system was divided into 2 modules: Parallel pressure ladder module (PPLM) [1] and Serial pressure ladder module (SPLM) which were experimented with 2 sizes of copper pipe: diameter 7.29 mm, thickness 0.25 mm, and length 10 km, and diameter 8 mm, thickness 0.25 mm, and length 10 km. From experiment, it can be noted that PPLM would perform better in elimination of oil residual compared to SPLM. About 97.44% (0.04 mg/m) and 97.59% (0.05 mg/m) of oil residual can be respectively eliminated from diameter 7.29 mm pipe and diameter 8 mm pipe which exceeded the standard allowance of 30% or 0.1 mg/m. Moreover, the cost of Nitrogen can be reduced by 6.25% per month.
