目的探究3D打印多孔结构陶瓷材料外科植入物孔隙结构的宏微观特征分析及评价方法。方法基于微米X射线CT(Micro-CT)扫描获取的多孔样品图像数据,利用VG Studio MAX 3.0软件及Mimics 16.0软件的多孔结构分析功能,对多孔结构的宏观结构特...目的探究3D打印多孔结构陶瓷材料外科植入物孔隙结构的宏微观特征分析及评价方法。方法基于微米X射线CT(Micro-CT)扫描获取的多孔样品图像数据,利用VG Studio MAX 3.0软件及Mimics 16.0软件的多孔结构分析功能,对多孔结构的宏观结构特征包括总孔隙率、宏孔孔径、内连接、开/闭孔率等进行测量和分析;同时,采用扫描电子显微镜对样品表面微观多孔形貌进行特征分析和评价。结果基于Micro-CT和SEM扫描及影像学分析实现了针对3D打印多孔结构陶瓷样件的孔隙结构的宏微观特征表征和统计分析,并验证了其可行性和准确性,形成了一套面向3D打印多孔结构陶瓷材料外科植入物形貌宏微结构尺寸特征的有效的测量和评价方法。结论本文提出的基于Micro-CT和SEM扫描成像进行3D打印多孔结构陶瓷样件的孔隙结构的宏微观特征表征和分析的统计方法,有利于实现多孔结构宏微观特征的相关测试内容和试验过程的规范统一,确保测试过程方法有据可依,结果评价准确有效,有利于提升产品的加工精度,便于不同企业同种工艺制造的多孔结构特征参数之间等同比较,为医疗器械行业多孔结构宏微观特征的数据积累奠定基础,有利于提高与人体生命安全息息相关的外科植入物产品的研发和制造水平。展开更多
A coupled discrete-continuum simulation incorporating a 3D aspect and non-circular particles was performed to analyze soil-pile interactions during pile penetration in sand.A self-developed non-circular particle numer...A coupled discrete-continuum simulation incorporating a 3D aspect and non-circular particles was performed to analyze soil-pile interactions during pile penetration in sand.A self-developed non-circular particle numerical simulation program was used which considered sand near the pile as interacted particles using a discrete element method;the sand away from the pile was simulated as a continuous medium exhibiting linear elastic behaviors.The domain analyzed was divided into two zones.Contact forces at the interface between the two zones were obtained from a discrete zone and applied to the continuum boundaries as nodal forces,while the interface velocities were obtained from the continuum zone and applied to the discrete boundaries.We show that the coupled discrete-continuum simulation can give a microscopic description of the pile penetration process without losing the discrete nature of the zone concerned,and may significantly improve computational efficiency.展开更多
文摘目的探究3D打印多孔结构陶瓷材料外科植入物孔隙结构的宏微观特征分析及评价方法。方法基于微米X射线CT(Micro-CT)扫描获取的多孔样品图像数据,利用VG Studio MAX 3.0软件及Mimics 16.0软件的多孔结构分析功能,对多孔结构的宏观结构特征包括总孔隙率、宏孔孔径、内连接、开/闭孔率等进行测量和分析;同时,采用扫描电子显微镜对样品表面微观多孔形貌进行特征分析和评价。结果基于Micro-CT和SEM扫描及影像学分析实现了针对3D打印多孔结构陶瓷样件的孔隙结构的宏微观特征表征和统计分析,并验证了其可行性和准确性,形成了一套面向3D打印多孔结构陶瓷材料外科植入物形貌宏微结构尺寸特征的有效的测量和评价方法。结论本文提出的基于Micro-CT和SEM扫描成像进行3D打印多孔结构陶瓷样件的孔隙结构的宏微观特征表征和分析的统计方法,有利于实现多孔结构宏微观特征的相关测试内容和试验过程的规范统一,确保测试过程方法有据可依,结果评价准确有效,有利于提升产品的加工精度,便于不同企业同种工艺制造的多孔结构特征参数之间等同比较,为医疗器械行业多孔结构宏微观特征的数据积累奠定基础,有利于提高与人体生命安全息息相关的外科植入物产品的研发和制造水平。
基金Project (No.90815008) supported by the National Natural Science Foundation of China
文摘A coupled discrete-continuum simulation incorporating a 3D aspect and non-circular particles was performed to analyze soil-pile interactions during pile penetration in sand.A self-developed non-circular particle numerical simulation program was used which considered sand near the pile as interacted particles using a discrete element method;the sand away from the pile was simulated as a continuous medium exhibiting linear elastic behaviors.The domain analyzed was divided into two zones.Contact forces at the interface between the two zones were obtained from a discrete zone and applied to the continuum boundaries as nodal forces,while the interface velocities were obtained from the continuum zone and applied to the discrete boundaries.We show that the coupled discrete-continuum simulation can give a microscopic description of the pile penetration process without losing the discrete nature of the zone concerned,and may significantly improve computational efficiency.
