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Liu K.-L.,Fuzhou University | Zhao G.,Fuzhou University | Zhu Z.-B.,Fuzhou University | Zhu Z.-B.,Xiamen Special Equipment Inspection Institute | Zheng R.-B.,China Special Equipment Inspection And Research Institute
Petrochemical Equipment

A cavity model was built at the outside of the cylindrical shell and contact pair was established between the outer wall of cylindrical shell and the inner wall of cavity. The effect of the contact and the gap between the cylindrical shell and the cavity to the critical buckling pressure was studied by the finite element analysis software ANSYS. The result show that the contact between the cylindrical shell and the cavity makes the critical buckling pressure of the cylindrical shell increased much, and the degree of increasing is relation to the gap existed between the cylindrical shell and the cavity. The bigger the size of the gap, the lower the level of the critical buckling pressure increases. Source

Zhu Z.-B.,Fuzhou University | Zhu Z.-B.,Xiamen Special Equipment Inspection Institute | Chen L.-J.,Fuzhou University | Yang X.-X.,Fuzhou University | Chen J.-Y.,Fuzhou University
Petrochemical Equipment

Aiming at polyethylene pipe's viscoelastic material properties, using ANSYS to analysis hot melt connector's mechanical properties of polyethylene pipe with ball hole cracks and predict the failure life through Matlab's program loop, compared to the polyethylene pipe's normal service life. Take Prony series analog PE pipe's viscoelastic mechanical properties, resulting in the maximum stress of polyethylene pipe is increased and the failure life of PE pipe is reduced while ball hole size increased. When the ball hole size exceeds a certain value, polyethylene pipe's life would not fulfill the requirements. Source

Ye J.,Harbin Institute of Technology | Ye J.,Xiamen Special Equipment Inspection Institute | Gang T.,Harbin Institute of Technology
Hanjie Xuebao/Transactions of the China Welding Institution

Signal processing was adopted in order to study the nonlinear behavior of ultrasound in diffusion bonding. First of all, diffusion bonding samples which contain typical defects were made by controlling the surface treatment before welding and changing the welding process. Ultrasonic testing was performed to obtain the data of ultrasonic signal which correlate with the joint states. Ultrasonic nonlinear effects of different states in diffusion bonding of stainless steel were analyzed from the points of view of the theory of ultrasonic nonlinearity in the joints of solid-phase connection, ultrasonic nonlinear images, microstructures and shear strength. The results showed that nonlinear ultrasonic testing was more sensitive to kissing bonds. It is possible to achieve nondestructive testing in diffusion bonding based both on C-scan images and ultrasonic nonlinear images to some extent. Source

Zhu Y.-K.,Fuzhou University | Zhu Z.-B.,Xiamen Special Equipment Inspection Institute | Zheng R.-B.,China Special Equipment Inspection And Research Institute | Zhou L.-Q.,Fuzhou University | Liu K.-L.,Fuzhou University
Petrochemical Equipment

Different thermal excitaiion methods in infrared thermography non destructive test (NDT) are discussed, and the application situation is introduced. The defects on inner wall of the pipe heated by electromagnetic induction were analyzed with the finite element process. The emphasis was placed on the temperature distribution on the outer wall and the relationship between different sizes of hole depth or bore diameter and the time. Influences and response measures on the method of thermal excitation based on electromagnetic induction in infrared thermography NDT is proposed. Source

Huang X.-B.,Xiamen Special Equipment Inspection Institute
Petrochemical Equipment

The principle of infrared thermography(IRT) is introduced briefly and the application of IRT in the research of pressure equipment inspection is reviewed. The study statues are analyzed and summarized for on-line comprehensive inspection on ammonia refrigeration pressure piping, pressure equipment's wall thickness measurement, leakage inspection and monitoring, liquid level measurement, insulating layer measurement, thermoelastic infrared detection. Further more, the factors which affected measurement accuracy are analyzed, and the application prospect of the infrared thermography nondestructive testing technology is discussed. Source

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