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Nico Verdonschot - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Interference Fit and bone damage of an uncemented femoral knee implant.
Clinical biomechanics (Bristol Avon), 2017Co-Authors: S. Berahmani, M. Hendriks, Joost J. A. De Jong, Joop P. W. Van Den Bergh, Thomas J.j. Maal, Dennis Janssen, Nico VerdonschotAbstract:Abstract Background During implantation of an uncemented femoral knee implant, press-Fit Interference Fit provides the primary stability. It is assumed that during implantation a combination of elastic and plastic deformation and abrasion of the bone will occur, but little is known about what happens at the bone-implant interface and how much press-Fit Interference Fit is eventually achieved. Methods Five cadaveric femora were prepared and implantation was performed by an experienced surgeon. Micro-CT- and conventional CT-scans were obtained pre- and post-implantation for geometrical measurements and to measure bone mineral density. Additionally, the position of the implant with respect to the bone was determined by optical scanning of the reconstructions. By measuring the differences in surface geometry, assessments were made of the cutting error, the actual Interference Fit, the amount of bone damage, and the effective Interference Fit. Findings Our analysis showed an average cutting error of 0.67 mm (SD 0.17 mm), which pointed mostly towards bone under-resections. We found an average actual AP Interference Fit of 1.48 mm (SD 0.27 mm), which was close to the nominal value of 1.5 mm. Interpretation We observed combinations of bone damage and elastic deformation in all bone specimens, which showed a trend to be related with bone density. Higher bone density tended to lead to lower bone damage and higher elastic deformation. The results of the current study indicate different factors that interact while implanting an uncemented femoral knee component. This knowledge can be used to fine-tune design criteria of femoral components to achieve adequate primary stability for all patients.
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evaluation of Interference Fit and bone damage of an uncemented femoral knee implant
Journal of Bone and Joint Surgery-british Volume, 2017Co-Authors: S. Berahmani, M. Hendriks, Dennis Janssen, Nico VerdonschotAbstract:The primary stability of an uncemented femoral total knee replacement component is provided by press-Fit forces at the bone-implant interface. This press-Fit is achieved by resecting the bone slightly larger than the inner dimensions of the implant, resulting in a so-called Interference Fit. Previous animal studies have shown that an adequate primary stability is required to minimize micromotions at the bone-implant interface to achieve bone-ingrowth, which provides the secondary (long-term) fixation. It is assumed that during implantation a combination of elastic and plastic deformation and abrasion of the bone will occur, but little is known about what happens at the bone-implant interface and how much Interference Fit eventually is achieved. Purpose of this study was therefore to assess the actual and effective Interference Fit and the amount of bone damage during implantation of an uncemented femoral knee component. In this study, five cadaveric distal femora were prepared and femoral knee components were implanted by an experienced surgeon. Micro-CT scans and conventional CT-scans were obtained pre- and post-implantation for geometrical measurements and to measure bone mineral density. In addition, the position of the implant with respect to the bone was determined by optical scanning of the reconstructions (Figure.1). By measuring the differences in surface geometry, assessments were made of the cutting error, the actual Interference Fit, the amount of bone damage, and the effective Interference Fit. Our analysis showed an average cutting error of 0.67± 0.17 mm, which pointed mostly towards bone under-resections. We found an average actual AP Interference Fit of 1.48± 0.27 mm, which was close to the nominal value of 1.5 mm. We observed combinations of bone damage and elastic deformation in all bone specimens (Figure. 2), which showed a trend to be related with bone density. Higher bone density tended to lead to lower bone damage and higher elastic deformation (Figure. 3). The results of the current study indicate different factors that interact while implanting an uncemented femoral knee component. This knowledge can be used to fine-tune design criteria of femoral components and obtain adequate primary stability for all patients in a more predictable way.
Dai Gil Lee - One of the best experts on this subject based on the ideXlab platform.
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Torque transmission capability of composite–metal Interference Fit joints
Composite Structures, 2007Co-Authors: Seungwoo Lee, Dai Gil LeeAbstract:In this paper the performance of an Interference Fit joint between a composite tube and a steel shaft under torsional load was investigated. Some important design parameters on the Interference Fit joint were presented and addressed based on the results from analytical and numerical models. The stress state of the joint under torsional load with contact elements was calculated by three dimensional finite element analysis. For the long term use of the Interference joint the viscoelastic behavior of the composite tube was also considered through the analytical model. Finally the validity of analysis of the Interference Fit joint was experimentally examined.
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torque transmission capability of composite metal Interference Fit joints
Composite Structures, 2007Co-Authors: Seungwoo Lee, Dai Gil LeeAbstract:In this paper the performance of an Interference Fit joint between a composite tube and a steel shaft under torsional load was investigated. Some important design parameters on the Interference Fit joint were presented and addressed based on the results from analytical and numerical models. The stress state of the joint under torsional load with contact elements was calculated by three dimensional finite element analysis. For the long term use of the Interference joint the viscoelastic behavior of the composite tube was also considered through the analytical model. Finally the validity of analysis of the Interference Fit joint was experimentally examined.
S. Berahmani - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Interference Fit and bone damage of an uncemented femoral knee implant.
Clinical biomechanics (Bristol Avon), 2017Co-Authors: S. Berahmani, M. Hendriks, Joost J. A. De Jong, Joop P. W. Van Den Bergh, Thomas J.j. Maal, Dennis Janssen, Nico VerdonschotAbstract:Abstract Background During implantation of an uncemented femoral knee implant, press-Fit Interference Fit provides the primary stability. It is assumed that during implantation a combination of elastic and plastic deformation and abrasion of the bone will occur, but little is known about what happens at the bone-implant interface and how much press-Fit Interference Fit is eventually achieved. Methods Five cadaveric femora were prepared and implantation was performed by an experienced surgeon. Micro-CT- and conventional CT-scans were obtained pre- and post-implantation for geometrical measurements and to measure bone mineral density. Additionally, the position of the implant with respect to the bone was determined by optical scanning of the reconstructions. By measuring the differences in surface geometry, assessments were made of the cutting error, the actual Interference Fit, the amount of bone damage, and the effective Interference Fit. Findings Our analysis showed an average cutting error of 0.67 mm (SD 0.17 mm), which pointed mostly towards bone under-resections. We found an average actual AP Interference Fit of 1.48 mm (SD 0.27 mm), which was close to the nominal value of 1.5 mm. Interpretation We observed combinations of bone damage and elastic deformation in all bone specimens, which showed a trend to be related with bone density. Higher bone density tended to lead to lower bone damage and higher elastic deformation. The results of the current study indicate different factors that interact while implanting an uncemented femoral knee component. This knowledge can be used to fine-tune design criteria of femoral components to achieve adequate primary stability for all patients.
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evaluation of Interference Fit and bone damage of an uncemented femoral knee implant
Journal of Bone and Joint Surgery-british Volume, 2017Co-Authors: S. Berahmani, M. Hendriks, Dennis Janssen, Nico VerdonschotAbstract:The primary stability of an uncemented femoral total knee replacement component is provided by press-Fit forces at the bone-implant interface. This press-Fit is achieved by resecting the bone slightly larger than the inner dimensions of the implant, resulting in a so-called Interference Fit. Previous animal studies have shown that an adequate primary stability is required to minimize micromotions at the bone-implant interface to achieve bone-ingrowth, which provides the secondary (long-term) fixation. It is assumed that during implantation a combination of elastic and plastic deformation and abrasion of the bone will occur, but little is known about what happens at the bone-implant interface and how much Interference Fit eventually is achieved. Purpose of this study was therefore to assess the actual and effective Interference Fit and the amount of bone damage during implantation of an uncemented femoral knee component. In this study, five cadaveric distal femora were prepared and femoral knee components were implanted by an experienced surgeon. Micro-CT scans and conventional CT-scans were obtained pre- and post-implantation for geometrical measurements and to measure bone mineral density. In addition, the position of the implant with respect to the bone was determined by optical scanning of the reconstructions (Figure.1). By measuring the differences in surface geometry, assessments were made of the cutting error, the actual Interference Fit, the amount of bone damage, and the effective Interference Fit. Our analysis showed an average cutting error of 0.67± 0.17 mm, which pointed mostly towards bone under-resections. We found an average actual AP Interference Fit of 1.48± 0.27 mm, which was close to the nominal value of 1.5 mm. We observed combinations of bone damage and elastic deformation in all bone specimens (Figure. 2), which showed a trend to be related with bone density. Higher bone density tended to lead to lower bone damage and higher elastic deformation (Figure. 3). The results of the current study indicate different factors that interact while implanting an uncemented femoral knee component. This knowledge can be used to fine-tune design criteria of femoral components and obtain adequate primary stability for all patients in a more predictable way.
Kaifu Zhang - One of the best experts on this subject based on the ideXlab platform.
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modeling on bearing behavior and damage evolution of single lap bolted composite Interference Fit joints
Composite Structures, 2019Co-Authors: Kaifu Zhang, Hui ChengAbstract:Abstract This paper deals with the modeling of bearing behavior and damage evolution of single-lap bolted composite Interference-Fit joints. Shear nonlinearity constitutive relations for composites are defined with the Ramberg-Osgood equation. The anisotropic damage model established on continuum damage mechanics incorporates extended 3D failure criteria and exponential damage evolution rule to describe damage initiation and material stiffness degradation, respectively. Numerical simulations of composite joints based on the proposed model under varying Interference-Fit sizes, bolt preload levels and composite layups are conducted and validated by experimental tests. Results show the interface voids of joint-hole in micro-scale left by hole-drilling would compensate part of the nominal Interference-Fit size and make the real Fit sizes smaller than the numerical ones. The strain contours and hyperechoic strips detected in bearing specimens are accurately characterized by damage patterns in joint models, whereas the predicted load-displacement behavior shows over-conservative errors caused by excessive bolt inclination. The fiber breakage and matrix crushing in micro-morphology on the bearing plane are well captured in numerical model, suggesting robust ability of the proposed model in application.
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mode i delamination mechanism analysis on cfrp Interference Fit during the installation process
Materials & Design, 2017Co-Authors: P Zou, Kaifu Zhang, Ping Liu, Heng ZhongAbstract:Abstract The wide application of composite materials in aerospace raises a new challenge for the joining technology. Though Interference-Fit can enhance joint strength, potential delamination damage also emerges for oversized percentage. A delamination analytical model during the Interference-Fit pin installation process is established in this paper. It consists of the critical delamination force (CDF) induced by mode I delamination and the pin-hole friction. The establishment of CDF model is based on fracture mechanics, classical bending plate theory and the mechanics of composites, and the friction model is built with classical anisotropic plate theory and friction law. Cohesive element (CE) based delamination simulation with bilinear softening constitutive law is made, and corresponding pin installation experiments are also conducted. The effect of Interference-Fit percentages and residual layers on CDF was analyzed and the critical Interference percentage below which delamination-free hole can be obtained was also proposed. Finite-element delamination results and experimental delamination specimens were analyzed and the rationality of the model was testified.
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micromechanical analysis for microscopic damage initiation in fiber epoxy composite during Interference Fit pin installation
Materials & Design, 2016Co-Authors: Danlong Song, Kaifu Zhang, Hui Cheng, Ping LiuAbstract:Abstract The Interference-Fit joint of composite structures is widely used in thin-walled sheets assembly of aviation field. Understanding the microscopic damage mechanism during Interference-Fit pin installation process has a great importance for optimal design of Interference-Fit joints. Therefore, a novel multi-scale modeling approach is proposed to simulate and analyze the squeezed damage of microscopic representative volume elements (RVEs) during Interference-Fit pin installation process by 2D finite element models on ABAQUS platform with user-defined material subroutine (UMAT). The plane stress and strain formulations are employed for in-plane and through-thickness models respectively. Once the maximum principal stress reaches the corresponding strength, linear elastic carbon fibers fail. The epoxy resin matrix is considered to be elastoplastic. When the ultimate strength is reached, the stiffness properties begin to degrade. A cohesive zone model is used to simulate interface debonding between the fiber and matrix. It's observed that the vicinity of 30° angle between normal pressure and fiber direction at the entrance of hole is the weakest portion. In addition, the plastic deformation of epoxy matrix occurs first, followed by interfacial debonding. Then compressive damage of epoxy matrix is observed with the increase of Interference value, which is similar to the micrograph by experiment.
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influence of Interference Fit size on bearing fatigue response of single lap carbon fiber reinforced polymer ti alloy bolted joints
Tribology International, 2016Co-Authors: Jian Li, Kaifu Zhang, Yuan LiAbstract:Abstract Fretting accelerates damage of mechanical joint; however, the Interference-Fit technology which makes an oversized fastener installed into a hole has been a method for durability enhancement. An experimental investigation was conducted to determine the effect of Interference-Fit size on the fretting fatigue life, hole elongation, and circumferential strain of carbon fiber-reinforced polymer(CFRP)/Ti alloy bolted joints. The relationship between Interference-Fit sizes and fretting fatigue life with various stress levels as well as the hole elongation variation is obtained. The circumferential strains of CFRP hole are investigated during dynamic loading, and the relationship between circumferential strain evolution and Interference-Fit size is presented.
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stress distribution modeling for Interference Fit area of each individual layer around composite laminates joint
Composites Part B-engineering, 2015Co-Authors: Danlong Song, Kaifu Zhang, Ping Liu, Hui ChengAbstract:Abstract The discussion about nonuniform stress distribution around Interference-Fit joint is particular significance in the design of composite laminates structures. In order to investigate the stress distribution of Interference-Fit area around composite laminates joint, an analytical model is developed for stress distribution based on the Lekhnitskii's complex potential theory. The normal and tangential stresses of contact are achieved by the relationship of deformation between pin and hole. The effects of ply orientation and Interference percentage on stress components distributions of each individual layer around symmetrical laminates joint are discussed. In order to verify the validity of the analytical model, extensive 3D finite element models are established to simulate the stress components of laminates Interference-Fit joint. The results show that the analytical model is valid, and the laminate property and ply orientation have a significant effect on stress distribution trend while Interference percentage mainly affects stress magnitude.
Seungwoo Lee - One of the best experts on this subject based on the ideXlab platform.
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Torque transmission capability of composite–metal Interference Fit joints
Composite Structures, 2007Co-Authors: Seungwoo Lee, Dai Gil LeeAbstract:In this paper the performance of an Interference Fit joint between a composite tube and a steel shaft under torsional load was investigated. Some important design parameters on the Interference Fit joint were presented and addressed based on the results from analytical and numerical models. The stress state of the joint under torsional load with contact elements was calculated by three dimensional finite element analysis. For the long term use of the Interference joint the viscoelastic behavior of the composite tube was also considered through the analytical model. Finally the validity of analysis of the Interference Fit joint was experimentally examined.
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torque transmission capability of composite metal Interference Fit joints
Composite Structures, 2007Co-Authors: Seungwoo Lee, Dai Gil LeeAbstract:In this paper the performance of an Interference Fit joint between a composite tube and a steel shaft under torsional load was investigated. Some important design parameters on the Interference Fit joint were presented and addressed based on the results from analytical and numerical models. The stress state of the joint under torsional load with contact elements was calculated by three dimensional finite element analysis. For the long term use of the Interference joint the viscoelastic behavior of the composite tube was also considered through the analytical model. Finally the validity of analysis of the Interference Fit joint was experimentally examined.