Vascular embolic diseases are associated with blockage of blood supply to vital organs and thus are lethal.Aspiration thrombectomy is becoming the primary choice for revascularization in the treatment of vascular occl...Vascular embolic diseases are associated with blockage of blood supply to vital organs and thus are lethal.Aspiration thrombectomy is becoming the primary choice for revascularization in the treatment of vascular occlusions condition.As the power source in the aspiration thrombectomy procedure,the aspiration pump directly influences the outcome of the operation.This research surveyed the current technical developments of the aspiration pump in China through reviewing information obtained from the patent database and technical literatures,commented on the issues in the current patent designs,and gave suggestions for future design improvement.This study can be used as a reference for researchers and developers of medical devices besides the neurosurgeons.展开更多
With the increasing applications of novel materials and structures in new-generation aircraft,conventional joining techniques in aircraft component assembly are greatly challenged.To meet those challenges,the electrom...With the increasing applications of novel materials and structures in new-generation aircraft,conventional joining techniques in aircraft component assembly are greatly challenged.To meet those challenges,the electromagnetic riveting(EMR)technique was developed as an advanced joining tool,which exhibits obvious advantages in the assembly of new-generation aircraft.In this paper,the riveting principle of EMR was analyzed,and its development history and status were presented in detail.Then,equipment features of three typical EMR systems were given.Moreover,three important applications of EMR were covered,i.e.,composite structure riveting,titanium rivet and large-size aluminum rivet riveting,and interference fit bolt installation.Specially,a novel strengthening method for mechanical linking holes based on EMR was also presented,which can significantly improve the fatigue behaviors of mechanical joints.Finally,open questions in the EMR field were discussed,and some recommendations for future work were also made.This paper can be useful for optimizing the joint designs of aircraft components and improving the level of aircraft maintenance.展开更多
Interference fit has advantages in improving fatigue behaviors of composite bolted joints,however, interference fit bolt insertion tends to cause damages in laminates weakening joint mechanical properties. Therefore, ...Interference fit has advantages in improving fatigue behaviors of composite bolted joints,however, interference fit bolt insertion tends to cause damages in laminates weakening joint mechanical properties. Therefore, an experimental study was conducted to investigate bolt insertion damages of Carbon Fiber Reinforced Polymer(CFRP)/CFRP interference fit bolted joints.Mechanical behaviors of joints were also evaluated experimentally under both quasi-static loads and cyclic loads. Scanning Electron Microscope(SEM) and high-resolution X-ray micro-CT scan were used to examine micro damages in laminates. Damage and failure behaviors of joints were characterized. The results demonstrated that the hole entrance in upper laminate and the laminate boundary near the hole wall were the most critical regions for damages during bolt insertions. However, the influence of those damages on quasi-static failure loads and fatigue failure modes of joints was minimal. Delamination and matrix cracking occurred first in laminates following fiber and matrix fracture in quasi-static tensile tests. Interference fit could improve the fatigue resistance of the laminate hole, however, the bolt seemed to suffer a more critical local fatigue loading condition.This paper can contribute to composite structure designs, especially in understanding damage and failure behaviors of composite bolted joints.展开更多
基金supported by the Natural Science Foundation of Shaanxi Province,China(2021JM-468)the China High Education Innovation Fund for Industry,Research and Development,Ministry of Education,China(Alibaba Cloud University Digital Innovation Program 2021ALA01002)+1 种基金the Open Research Grant from the Beijing Key Laboratory of Fundamental Research on Biomechanics in Clinical Application,China(2022KF02)the Key R&D grant from the Xianyang Municipal Science and Technology Bureau,China(L2022ZDYFSF051).
文摘Vascular embolic diseases are associated with blockage of blood supply to vital organs and thus are lethal.Aspiration thrombectomy is becoming the primary choice for revascularization in the treatment of vascular occlusions condition.As the power source in the aspiration thrombectomy procedure,the aspiration pump directly influences the outcome of the operation.This research surveyed the current technical developments of the aspiration pump in China through reviewing information obtained from the patent database and technical literatures,commented on the issues in the current patent designs,and gave suggestions for future design improvement.This study can be used as a reference for researchers and developers of medical devices besides the neurosurgeons.
基金funded by the Major National Research Project of Numerical Control Machine and Basic Manufacturing Equipment of China(No.2016ZX04002004-008).
文摘With the increasing applications of novel materials and structures in new-generation aircraft,conventional joining techniques in aircraft component assembly are greatly challenged.To meet those challenges,the electromagnetic riveting(EMR)technique was developed as an advanced joining tool,which exhibits obvious advantages in the assembly of new-generation aircraft.In this paper,the riveting principle of EMR was analyzed,and its development history and status were presented in detail.Then,equipment features of three typical EMR systems were given.Moreover,three important applications of EMR were covered,i.e.,composite structure riveting,titanium rivet and large-size aluminum rivet riveting,and interference fit bolt installation.Specially,a novel strengthening method for mechanical linking holes based on EMR was also presented,which can significantly improve the fatigue behaviors of mechanical joints.Finally,open questions in the EMR field were discussed,and some recommendations for future work were also made.This paper can be useful for optimizing the joint designs of aircraft components and improving the level of aircraft maintenance.
基金funded by China Postdoctoral Science Foundation(No.2020M673227)NSAF,China(No.U1830122)Sichuan Science and Technology Program,China(No.2020YFG0109)。
文摘Interference fit has advantages in improving fatigue behaviors of composite bolted joints,however, interference fit bolt insertion tends to cause damages in laminates weakening joint mechanical properties. Therefore, an experimental study was conducted to investigate bolt insertion damages of Carbon Fiber Reinforced Polymer(CFRP)/CFRP interference fit bolted joints.Mechanical behaviors of joints were also evaluated experimentally under both quasi-static loads and cyclic loads. Scanning Electron Microscope(SEM) and high-resolution X-ray micro-CT scan were used to examine micro damages in laminates. Damage and failure behaviors of joints were characterized. The results demonstrated that the hole entrance in upper laminate and the laminate boundary near the hole wall were the most critical regions for damages during bolt insertions. However, the influence of those damages on quasi-static failure loads and fatigue failure modes of joints was minimal. Delamination and matrix cracking occurred first in laminates following fiber and matrix fracture in quasi-static tensile tests. Interference fit could improve the fatigue resistance of the laminate hole, however, the bolt seemed to suffer a more critical local fatigue loading condition.This paper can contribute to composite structure designs, especially in understanding damage and failure behaviors of composite bolted joints.