Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEM)simulation are presented ...Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEM)simulation are presented in this study.In the thickness direction,the GEC layers of the conical shell are ordered in a piece-wise arrangement of functionally graded(FG)distribution,with each layer containing a variable volume fraction for graphene reinforcement.To calculate the properties of temperaturedependent material of GEC layers,the extended Halpin-Tsai micromechanical framework is used.The FEM model is verified via comparing the current results obtained with the theoretical estimates for homogeneous,laminated cylindrical,and conical shells,the FEM model is validated.The computational results show that a piece-wise FG graphene volume fraction distribution can improve the torque of critical buckling and torsional postbuckling strength.Also,the geometric parameters have a critical impact on the stability of the conical shell.However,a temperature rise can reduce the crucial torsional buckling torque as well as the GEC laminated truncated conical shell’s postbuckling strength.展开更多
TBM钢拱架是用于隧道掘进开挖最重要的支护构件之一,其安装效率对隧道的稳定性及人员的安全性有着重要影响。为了减小TBM在隧道掘进过程中产生的振动造成钢拱架拼装系统安装效率低的不利影响,文中将约束理论(Theory of Constraints, TOC...TBM钢拱架是用于隧道掘进开挖最重要的支护构件之一,其安装效率对隧道的稳定性及人员的安全性有着重要影响。为了减小TBM在隧道掘进过程中产生的振动造成钢拱架拼装系统安装效率低的不利影响,文中将约束理论(Theory of Constraints, TOC)和发明问题解决理论(Theory of Inventive Problem Solving, TRIZ)进行融合,应用于钢拱架拼装机构的减振设计。首先,采用TOC对钢拱架拼装机构的不合理约束进行系统分析;然后,运用TRIZ求解输出多种设计方案,结合工程实际对不同方案进行评估分析;最后,提出合理的问题解决方案。通过TOC/TRIZ理论的融合应用解决了钢拱架拼装机构的振动问题,为相关隧道工程装备的设计提供了参考。展开更多
文摘Buckling and postbuckling characteristics of laminated graphene-enhanced composite(GEC)truncated conical shells exposed to torsion under temperature conditions using finite element method(FEM)simulation are presented in this study.In the thickness direction,the GEC layers of the conical shell are ordered in a piece-wise arrangement of functionally graded(FG)distribution,with each layer containing a variable volume fraction for graphene reinforcement.To calculate the properties of temperaturedependent material of GEC layers,the extended Halpin-Tsai micromechanical framework is used.The FEM model is verified via comparing the current results obtained with the theoretical estimates for homogeneous,laminated cylindrical,and conical shells,the FEM model is validated.The computational results show that a piece-wise FG graphene volume fraction distribution can improve the torque of critical buckling and torsional postbuckling strength.Also,the geometric parameters have a critical impact on the stability of the conical shell.However,a temperature rise can reduce the crucial torsional buckling torque as well as the GEC laminated truncated conical shell’s postbuckling strength.
文摘TBM钢拱架是用于隧道掘进开挖最重要的支护构件之一,其安装效率对隧道的稳定性及人员的安全性有着重要影响。为了减小TBM在隧道掘进过程中产生的振动造成钢拱架拼装系统安装效率低的不利影响,文中将约束理论(Theory of Constraints, TOC)和发明问题解决理论(Theory of Inventive Problem Solving, TRIZ)进行融合,应用于钢拱架拼装机构的减振设计。首先,采用TOC对钢拱架拼装机构的不合理约束进行系统分析;然后,运用TRIZ求解输出多种设计方案,结合工程实际对不同方案进行评估分析;最后,提出合理的问题解决方案。通过TOC/TRIZ理论的融合应用解决了钢拱架拼装机构的振动问题,为相关隧道工程装备的设计提供了参考。
