A numerical investigation of the limit loads is carried out for pressure vessels with part-through slots using a general computational method for the limit analysis of 3-D structures. The limit pressures are given for...A numerical investigation of the limit loads is carried out for pressure vessels with part-through slots using a general computational method for the limit analysis of 3-D structures. The limit pressures are given for a comprehensive range of geometric parameters. Some of the calculated results are compared with the results of 3-D elastic-plastic finite element analysis and existing numerical solutions. The effects of various shapes and sizes of part-through slots on the load carrying capacity of cylindrical shells are investigated and evaluated. Two kinds of typical failure modes corresponding to different dimensions of slots are studied. Based on the numerical results, a geometric parameter G which combines the slot dimensions and the cylinder geometry is presented. It reasonably reflects the overall effect of slots on the limit loads of cylinders. An empirical formula for estimating the limit pressures of cylindrical shells with part-through slots is obtained.展开更多
Abstract: A new initiator. potassium diperiodatoargentate (Ⅲ). was used to initiate graft copolymerization of butryl acrylate(BuA) onto casein which showed a very high grafiting efficiency. grafting efficiency andper...Abstract: A new initiator. potassium diperiodatoargentate (Ⅲ). was used to initiate graft copolymerization of butryl acrylate(BuA) onto casein which showed a very high grafiting efficiency. grafting efficiency andpercent conversion of monomer were evaluated in all cases. Infrared spectra and thermal analysis for casein and the grafting copolymer were taken to establish evidence for grafting. A possible initiation mechanism was proposed.展开更多
文摘A numerical investigation of the limit loads is carried out for pressure vessels with part-through slots using a general computational method for the limit analysis of 3-D structures. The limit pressures are given for a comprehensive range of geometric parameters. Some of the calculated results are compared with the results of 3-D elastic-plastic finite element analysis and existing numerical solutions. The effects of various shapes and sizes of part-through slots on the load carrying capacity of cylindrical shells are investigated and evaluated. Two kinds of typical failure modes corresponding to different dimensions of slots are studied. Based on the numerical results, a geometric parameter G which combines the slot dimensions and the cylinder geometry is presented. It reasonably reflects the overall effect of slots on the limit loads of cylinders. An empirical formula for estimating the limit pressures of cylindrical shells with part-through slots is obtained.
文摘Abstract: A new initiator. potassium diperiodatoargentate (Ⅲ). was used to initiate graft copolymerization of butryl acrylate(BuA) onto casein which showed a very high grafiting efficiency. grafting efficiency andpercent conversion of monomer were evaluated in all cases. Infrared spectra and thermal analysis for casein and the grafting copolymer were taken to establish evidence for grafting. A possible initiation mechanism was proposed.
