The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Cao H - One of the best experts on this subject based on the ideXlab platform.
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Structural integrity assessment of heart valve prostheses: a damage tolerance analysis of the CarboMedics Prosthetic Heart Valve.
The Journal of heart valve disease, 1996Co-Authors: Cao HAbstract:The design of mechanical heart valve prostheses must satisfy three basic requirements: biocompatibility, efficiency and durability. Over the past 25 years of clinical use, pyrolytic carbon has proven to be biocompatible and thromboresistant, and is therefore the material of choice for mechanical heart valve prostheses. However, in recent years the material has been questioned in this application because it is brittle and susceptible to subcritical crack growth. This has raised concerns regarding the structural reliability of prostheses constructed from this material. This paper describes the application of the damage tolerance methodology to assess the structural integrity of heart valve prostheses made of pyrolytic carbon. In particular, an analysis of the CarboMedics Prosthetic Heart Valve (CPHV) is presented. A new measure of Fatigue Lifetime, the Fatigue Safe-Life index, is introduced. Additionally, the degradation of structural integrity from cavitation erosion is examined. It is shown that structural integrity, especially for brittle materials, is not just a function of design, but involves the entire manufacturing process. The damage tolerance method can be applied to assess and ensure the structural integrity of pyrolytic carbon prosthetic heart valve components.
Taejoo Kim - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Safe Life analysis of helicopter bearingless rotor hub composite flexbeam
Journal of The Korean Society for Aeronautical & Space Sciences, 2013Co-Authors: Taejoo Kim, Youngjoong Kee, Deogkwan Kim, Seungho KimAbstract:After we designed Bearingless rotor hub system for 7,000lb class helicopter, flexbeam Fatigue analysis was conducted for validation of requirement Life time 8,000 hours. sectional structural analysis method applying elastic beam model was used. Fatigue analysis for two sections of flexbeam which were expected to weak to Fatigue damage from result of static analysis was conducted. Extension, bending and torsion stiffness of flexbeam section shape was calculated using VABS for structure analysis. S-N curve of two composite material which composed flexbeam was generated using wohler equation. Load analysis of bearingless rotor system was conducted using CAMRAD II and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used flexbeam Fatigue Safe Life analysis.
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Fatigue Safe Life Evaluation of Rotating Swashplate of Helicopter Main Rotor Control System
Transactions of the Korean Society of Mechanical Engineers A, 2012Co-Authors: Dong Chul Kim, Pan Ho Lee, Shin Hyun Kang, Young Don Choi, Taejoo KimAbstract:The main rotor control system is an important structural part of a helicopter that manages the thrust and control force of the helicopter. The main rotor control system consists of a swashplate assembly, scissor assembly, pitch rod assembly, guide, etc. The main rotor control system must endure various loads, such as the thrust and control force, and must meet the optimized Fatigue Safety Life. The rotating swashplate is an important structure influenced by the pitch rod load and rotating scissor load. In this paper, the accuracy of a result about the rotating swashplate part of the main rotor control system is proven through comparison between Fatigue test and FEM results. Based on this result, we estimate the Lifetime and deduce the Fatigue Safe Lifetime.
Da Wei Jiang - One of the best experts on this subject based on the ideXlab platform.
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Effects of Laser Shock Processing on Fatigue Lives of Heat-Resistant Steel and Estimation of Fatigue Safe Lives
Advanced Materials Research, 2011Co-Authors: Yong Zhuo Huangfu, Xu Dong Ren, Liang Ruan, Yong Kang Zhang, Da Wei JiangAbstract:Fatigue tensile treatment was performed on 00Cr12 heat-resistant steel specimens which had been treated by laser shock processing (LSP). The unilateral tolerance factor statistical analysis method and the two-dimensional Weibull distribution method were used to predict the values of Fatigue Safe lives of the specimens respectively. The results indicate that the Fatigue lives of 00Cr12 specimens were enhanced greatly after LSP, and improved by 62% compared with the specimens which were not treated by LSP. The unilateral tolerance factor method obtained an exact estimation value of the Fatigue Safe Life; while the two-dimensional Weibull distribution method can get a range of values of Fatigue Safe lives, the Fatigue Safe lives of the specimens which after LSP were a range from 116570 to 150230, the average value was 132330. The two-dimensional Weibull distribution method has more engineering applicability and can be used to estimate the Fatigue Safe lives with fewer experiments.
Teng Junpeng - One of the best experts on this subject based on the ideXlab platform.
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Estimation of Corrosion Fatigue-Safe Life of 7B06-T6 and 30CrMnSiA JointSpecimens
2019 International Conference on Quality Reliability Risk Maintenance and Safety Engineering (QR2MSE), 2019Co-Authors: Yuqin Zhu, Kun Zhou, Chengzhang Wang, Chen Yuan, Teng JunpengAbstract:The 7B04-T6 and 30CrMnSiA joints were pretensioned and exposed to hot and humid marine climate for corrosion test. They were taken back after different cycles of test and Fatigue-loaded. Then the Fatigue Life values of six cycles were studied. The Fatigue-Safe Life of the joints was estimated by using the one-sided tolerance factor method. The results show that the Fatigue Life of the joint specimen is greatly reduced by the interaction of the corrosive environment and Fatigue load. Taking the confidence and reliability into consideration, the one-sided tolerance factor method makes it is possible to obtain an accurate estimated value of Fatigue-Safe Life and thus plays a guiding role in the use of engineering application materials.
Seungho Kim - One of the best experts on this subject based on the ideXlab platform.
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Fatigue Safe Life analysis of helicopter bearingless rotor hub composite flexbeam
Journal of The Korean Society for Aeronautical & Space Sciences, 2013Co-Authors: Taejoo Kim, Youngjoong Kee, Deogkwan Kim, Seungho KimAbstract:After we designed Bearingless rotor hub system for 7,000lb class helicopter, flexbeam Fatigue analysis was conducted for validation of requirement Life time 8,000 hours. sectional structural analysis method applying elastic beam model was used. Fatigue analysis for two sections of flexbeam which were expected to weak to Fatigue damage from result of static analysis was conducted. Extension, bending and torsion stiffness of flexbeam section shape was calculated using VABS for structure analysis. S-N curve of two composite material which composed flexbeam was generated using wohler equation. Load analysis of bearingless rotor system was conducted using CAMRAD II and load analysis result was applied HELIX/FELIX standard load spectrum to generate bearingless rotor system load spectrum which was used flexbeam Fatigue Safe Life analysis.
