The numerical simulation and digital solution of many engineering problems in solid mechanics, fluid dynamics and a wide range of other fields is now widespread. Design processes rely more and more on the results of C...
详细信息
The numerical simulation and digital solution of many engineering problems in solid mechanics, fluid dynamics and a wide range of other fields is now widespread. Design processes rely more and more on the results of CAE modelling, bringing an increased need to ensure that those results are reliable-not only in the verification of basic algorithms and their embodiment in computer code, but also at the level of the processes by which these codes are used and the good judgement of the people using them. The 'fitness for purpose' of any modelling and analysis process must be established: firstly its'purpose'-in design, optimization, certification and so on-and then its 'fitness'. This paper addresses the requirements for benchmarking and quality assurance of CAE methods;their appropriate application and integration into engineering design and certification processes;and the education and training-and potential accreditation-of users. The NAFEMS organization has existed for over 25 years-commencing in the UK and growing into a worldwide, independent association for the engineering analysis community-dedicated to addressing these needs in an independent and unbiased way.
This study investigates the numerical simulation and theoretical modeling of longitudinal and transverse compressive failure in fiber reinforced composite *** the numerical simulation of longitudinal compressive failu...
详细信息
This study investigates the numerical simulation and theoretical modeling of longitudinal and transverse compressive failure in fiber reinforced composite *** the numerical simulation of longitudinal compressive failure is *** simulated results show that at one moment of the loading,the localized deformation catastrophically appears in the material,and in this initiation of the localized deformation,the reduction of tan gent shear stiffness plays an important *** on the simulated results,the theoretical modeling of longitudinal compressive failure is implemented.A set of mathematical equations is obtained for the deformation of composite materials,and the mathematical solution of the equations is *** exists a state where arbitrariness appears in the solution of equations expressing deformation of composite materials,and it is indicated that the onset of arbitrariness in solution of equations expressing deformation of composite materials is closely related with the initiation of longitudinal compressive failure,and also related with the initiation of narrow localized band in the *** the transverse compressive failure is *** the numerical simulation,multiple shear bands appear in the material,and one of the shear bands develops to the entire material,and the transverse compressive failure is formed in the *** theoretical model of transverse compressive failure shows that the critical stress value is represented by fiber volume fraction,matrix Poisson's ratio,matrix yield stress and angle of shear *** the numerical simulation is conducted for compressive failure in composite laminate including quasi-isotropic laminate and cross-ply *** localized deformation also appears in the laminate,and the simulated deformation of the material agrees with the microscope picture of the experimental result.
暂无评论