The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to a...The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to achieve a good understanding of the deformation in necking process by spinning and the numerical simulation results are in good agreement with the test results.展开更多
The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characterist...The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characteristics of the metal flowing, the distributions of the stress and strain, the possible defects and areas during spinning are obtained. The influence of the nominal reduction of the blank radius per path on the metal flowing and deformation is also researched theoretically and experimentally. It shows that the nominal reduction of the blank radius per path has great influence on the neck spinning process of oblique tubes. A reasonable nominal reduction of the blank radius per path is very important to guarantee the proceeding of the spinning process and to obtain a sound products.展开更多
An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%...An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%,the material by 36%,and the energy by49%.展开更多
重症口腔颌面颈部多间隙感染患者占总住院患者的3.95%(115/2 910),其中男女比1.88∶1,平均年龄53岁(6~83岁),牙源性感染占80%,农村人群占79.13%。从发病到就诊时间平均为9.5 d(3~30 d),仅33.91%就诊于1周内。入院前3.48%的患者未接受过...重症口腔颌面颈部多间隙感染患者占总住院患者的3.95%(115/2 910),其中男女比1.88∶1,平均年龄53岁(6~83岁),牙源性感染占80%,农村人群占79.13%。从发病到就诊时间平均为9.5 d(3~30 d),仅33.91%就诊于1周内。入院前3.48%的患者未接受过任何治疗,19.13%自服消炎药,县、乡两级医院仅对9例患者开髓、6例患者脓肿切排。入院后80例患者采用一次性多功能引流管辅助冲洗技术治疗,32例采用传统治疗。多功能引流管治疗组治愈率(90%vs 75%,P=0.03),住院天数(15.01±0.53 vs 18.13±0.85,P=0.02),抗菌药物使用天数(11.89±0.43 vs 16.25±0.84,P<0.00),医生换药频次(5.71±0.28 vs 23.75±1.63,P<0.00)等均优于传统组。展开更多
文摘The spinning deformation of thin walled tube in necking process is simulated with a dynamic explicit FEM program,LS DYNA3D and the distributions of Cauchy strains and thickness are analyzed through time history to achieve a good understanding of the deformation in necking process by spinning and the numerical simulation results are in good agreement with the test results.
文摘The process of the neck spinning of oblique tubes is simulated by means of the 3D elastic-plastic finite element software, MSC.MARC. The dynamic boundary and contact problems in simulation are solved. The characteristics of the metal flowing, the distributions of the stress and strain, the possible defects and areas during spinning are obtained. The influence of the nominal reduction of the blank radius per path on the metal flowing and deformation is also researched theoretically and experimentally. It shows that the nominal reduction of the blank radius per path has great influence on the neck spinning process of oblique tubes. A reasonable nominal reduction of the blank radius per path is very important to guarantee the proceeding of the spinning process and to obtain a sound products.
基金Foreign Experts Bureau of the State Council,Ministry of Electronics IndustryGovernment of Jiangsu Province
文摘An in-neck yoke 14" CRT displaying 1280 TVL live picture is developed.It operates at60℃,64 KHz and 6 Amps,showing normal vacuum properties.Compared with the conven-tional yokes,it reduces the corner spots by 19%,the material by 36%,and the energy by49%.
文摘重症口腔颌面颈部多间隙感染患者占总住院患者的3.95%(115/2 910),其中男女比1.88∶1,平均年龄53岁(6~83岁),牙源性感染占80%,农村人群占79.13%。从发病到就诊时间平均为9.5 d(3~30 d),仅33.91%就诊于1周内。入院前3.48%的患者未接受过任何治疗,19.13%自服消炎药,县、乡两级医院仅对9例患者开髓、6例患者脓肿切排。入院后80例患者采用一次性多功能引流管辅助冲洗技术治疗,32例采用传统治疗。多功能引流管治疗组治愈率(90%vs 75%,P=0.03),住院天数(15.01±0.53 vs 18.13±0.85,P=0.02),抗菌药物使用天数(11.89±0.43 vs 16.25±0.84,P<0.00),医生换药频次(5.71±0.28 vs 23.75±1.63,P<0.00)等均优于传统组。
