Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was int...Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was introduced.Secondly,an expert module rule for selecting welding heat source model was founded,which is based on simulation knowledge and experiences.Thirdly,a modularity routine method was investigated using writing with C++programing,which automatically creates subroutines of 3D dynamic heat source model for user.To realize the dynamic weld path,the local weld path coordinate system was moved in the global coordinate system and it is used to model the direction of weld gun,welding path and welding pose.The weld path data file was prepared by the automatic tool for the welding heat source subroutines.All above functions were integrated in the user interface and the connection with architecture was introduced.At last,a laser beam welding heat source modeling was automatically modeled and the weld pool geometry was compared with the reported literature.It demonstrated that the automated tool is valid for welding simulation.Since modeling became convenient for welding simulation using the tool proposed,it could be easy and useful for welding engineers to acquire the needed information.展开更多
运用最先进的小型加速加载设备MMLS3(1/3model mobile load simulator)对常见的用于上、中面层的4种改性沥青混合料进行了高温稳定性试验,提出了适合中国的MMLS3室内加速加载的各项试验参数.通过研究改性沥青混合料的实际抗车辙性能,得...运用最先进的小型加速加载设备MMLS3(1/3model mobile load simulator)对常见的用于上、中面层的4种改性沥青混合料进行了高温稳定性试验,提出了适合中国的MMLS3室内加速加载的各项试验参数.通过研究改性沥青混合料的实际抗车辙性能,得出沥青混合料高温稳定性能的优劣顺序为:SBS橡胶复合改性SMA-13,SBS改性AC-20C,SBS改性AC-13C,SBS橡胶复合改性OGFC-13,岩沥青改性AC-20C.由于OGFC-13的大空隙结构,必然要在某种程度上牺牲其强度、抗剪切性能及耐久性,不建议在重交通的高速公路上使用其作为表面层.高温重载或超限地区应加强中面层的优化设计.MMLS3加载试验及常规动稳定度试验在衡量空隙率差距小的沥青混合料时,两者试验结果具有较好的一致性;而对于不同沥青混合料,当其空隙率差距大时,应根据需要选择合适的试验或评价方法.展开更多
In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande...In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande box shear and oedometric tests. This methodology was used as a substitute for triaxial trials. In this article, we first verify the test results by the finite element method with the Optum software. We use a simulation of the tests with the modified Cam Clay model as the behavior model. Then, we simulate the oedometric test on tropical soils with the Castem software and also use the modified Cam Clay model. These calculations make it possible to write the criterion of plasticity of the material starting from the expression of the surface of load while passing by the calculation of the volumetric and deviatoric stresses.展开更多
基金supported by Young Innovative Talents Training Plan of Heilongjiang(UNPYSCT-2018133).
文摘Since programing complex and dynamic heat source model for welding simulation is a complex job,the parametric methods are studied in this paper.Firstly,an overall flow to achieve automatically modeling welding was introduced.Secondly,an expert module rule for selecting welding heat source model was founded,which is based on simulation knowledge and experiences.Thirdly,a modularity routine method was investigated using writing with C++programing,which automatically creates subroutines of 3D dynamic heat source model for user.To realize the dynamic weld path,the local weld path coordinate system was moved in the global coordinate system and it is used to model the direction of weld gun,welding path and welding pose.The weld path data file was prepared by the automatic tool for the welding heat source subroutines.All above functions were integrated in the user interface and the connection with architecture was introduced.At last,a laser beam welding heat source modeling was automatically modeled and the weld pool geometry was compared with the reported literature.It demonstrated that the automated tool is valid for welding simulation.Since modeling became convenient for welding simulation using the tool proposed,it could be easy and useful for welding engineers to acquire the needed information.
文摘运用最先进的小型加速加载设备MMLS3(1/3model mobile load simulator)对常见的用于上、中面层的4种改性沥青混合料进行了高温稳定性试验,提出了适合中国的MMLS3室内加速加载的各项试验参数.通过研究改性沥青混合料的实际抗车辙性能,得出沥青混合料高温稳定性能的优劣顺序为:SBS橡胶复合改性SMA-13,SBS改性AC-20C,SBS改性AC-13C,SBS橡胶复合改性OGFC-13,岩沥青改性AC-20C.由于OGFC-13的大空隙结构,必然要在某种程度上牺牲其强度、抗剪切性能及耐久性,不建议在重交通的高速公路上使用其作为表面层.高温重载或超限地区应加强中面层的优化设计.MMLS3加载试验及常规动稳定度试验在衡量空隙率差距小的沥青混合料时,两者试验结果具有较好的一致性;而对于不同沥青混合料,当其空隙率差距大时,应根据需要选择合适的试验或评价方法.
文摘In order to make the use of complex elasto-plastic behavior models more accessible, we attempted to identify the Cam-Clay model in two samples of tropical and lateritic soils (from Senegal/West Africa) from casagrande box shear and oedometric tests. This methodology was used as a substitute for triaxial trials. In this article, we first verify the test results by the finite element method with the Optum software. We use a simulation of the tests with the modified Cam Clay model as the behavior model. Then, we simulate the oedometric test on tropical soils with the Castem software and also use the modified Cam Clay model. These calculations make it possible to write the criterion of plasticity of the material starting from the expression of the surface of load while passing by the calculation of the volumetric and deviatoric stresses.
