bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fluid-Structure Interaction Analysis of a Peristaltic Pump by Using Numerical and Experimental Methods
Authors: Li Qingye , Zong Chaoyong , Zhang Jianhua , Zhang Yanfeng , Song Xueguan 
Published: November 2022

Abstract
Peristaltic pump is an important transport device which is widely used in industries involving pharmaceutical, petrochemical, biomedical, and food processing. For designed and/or optimized purpose, it is necessary to have a thorough understanding the mechanism of its dynamics. For this purpose, both numerical and experimental investigations have been performed in this paper. In the numerical study, a numerical model concerning two-way Fluid-structure Interaction (FSI) phenomenon is developed, where the Mooney-Rivlin hyper-elasticity model and dynamic mesh technique are employed to simulate a complete operating period of a peristaltic pump. For model verification, a series of experimental tests are performed and the results of the simulation and the tests were compared, which showed a good agreement. With the validated model, a detailed velocity and pressure distribution of a working period of the peristaltic pump is obtained, the mass flow rate is analyzed to illustrate the mechanism of the flow fluctuations.
Numerical Simulation of Complex Fracture Network Propagation in Shallow Bright-Type Coal Seams in Hancheng Block, China
Authors: Zhao Haifeng , Li Xuejiao , Wang Xiaohua , Li Pengyue , Zhu Likai , Zhang Qingjiu 
Published: November 2022

Abstract
The generation of complex fracture networks by hydraulic fractures activating and connecting natural cleats and fractures during hydraulic fracturing is of great significance to the development of coalbed methane (CBM) reservoirs. Hydraulic fracturing physical simulation experiments of shallow bright-type coal seams in Hancheng block were conducted. Based on the experiment results, fluid-solid interaction theory, and discrete fracture network model, a 3D fracture network model of bright-type coal seams was developed. Fracture network propagation behaviors under different rock mechanical properties and fracturing operation parameters were investigated. Sensitivity analysis of the influencing factors of fracture network propagation was performed with the grey correlation method. The results show that a complex fracture network dominated by the main fracture is formed after hydraulic fracturing in bright-type coal seams. Fracturing operational parameters (fracturing fluid displacement and viscosity and perforation location) are the main controlling factors of fracture network propagation, whereas Poisson’s ratio of the coal seam has a relatively weak effect on the fracture network. As the elastic modulus difference between the roof and coal seam increases, the fracture network conductivity and simulated reservoir volume (SRV) first increase and then decrease. When the elastic modulus difference between layers is 10 GPa, the conductivity and SRV achieve their maximum values. With increasing displacement, the length, height and SRV of the fracture network increase linearly, but the conductivity decreases. Large displacement is beneficial to the formation of a complex fracture network in bright-type coal seams. The optimized fracturing fluid viscosity is 20 mPa·s. The optimal perforation location is near the formation interface. The results could provide theoretical guidance for the design and optimization of efficient fracturing of CBM reservoirs.
Research on On-Line Monitoring and Evaluation Method of Thermal Insulation Performance of Vehicle LNG Gas Cylinder
Authors: Shi Kun , Zhou Yunyi , Hu Hangjian , Duan Zhixiang 
Published: November 2022

Abstract
Driven by energy structure optimization, environmental pollution control and climate change constraints, the development of new energy vehicles has become a global trend, LNG (Liquefied Natural Gas) vehicles whose key energy storage equipment is the low-temperature insulated gas cylinders are one of the most important components. The feasibility of online health monitoring of low-temperature insulated gas cylinders for vehicles is verified in this paper and an online monitoring device for vehicle gas cylinder thermal insulation performance parameters is designed and implemented. Together with the wireless communication technology and the online monitoring device, the remote management platform for gas cylinder safety and health can be constructed. Through experiments, the static evaporation rate and holding time of low-temperature insulated gas cylinders with different filling rates and vacuum degrees were measured and the pressure boost curve before and after vacuum loss was obtained. By analyzing the experimental data, it is found that the rate of pressure rise of the cylinder is different before and after vacuum loss, so the safety condition of the cylinder can be evaluated. Compared with traditional vehicle gas cylinder inspection, it can save inspection time by monitoring the rate of pressure rise instead, which can realize the improvement of the efficiency of gas cylinder inspection and the timeliness of equipment risk warning.
Development of Material Mechanical Properties Testing Platform for Liquid Hydrogen Temperature Zone
Authors: Feng Yufeng , Wu Yingzhe , Kuang Jiyong , Gu Chaohua , Zheng Jinyang , Hua Zhengli , Gao Ruizhe 
Published: November 2022

Abstract
Many materials exhibit a ductile-brittle transition as the temperature decreases. Liquefied gas and cryogenic equipment become more and more widely used in the industry, especially the accelerated commercialization of the liquid hydrogen industry. However, there is a lack of cryogenic mechanical property testing platform and published material mechanical property data below the liquid nitrogen temperature zone (77K). The development of cryogenic mechanical property testing platform is the basis for obtaining cryogenic mechanical property data of materials.
Therefore, based on the existing cryogenic mechanical testing platform of the team, a system-level design of the modified cryogenic mechanical testing platform was designed and implemented. The modified platform is named Mechanical Performance Testing Platform for Liquid Hydrogen Temperature Zone and it is using a Gifford-Mcmahon refrigerator to provide cryogenic cooling and a refrigerated helium circulation loop to transfer the cooling to the specimen effectively. The lowest test temperature can reach the liquid hydrogen temperature range 20K. Finally, tensile tests of S30408 (Equivalent to UNS S30400) austenitic stainless steel at 20K and 77K are carried out by the Testing Platform.
The Study of Impact Damage of Carbon Fiber Wrapped Cylinder With Aluminum Liner Based on X-Ray Digital Radiography
Authors: Chai Sen , Huang Liang , Dai Huaibei , Bo Ke , Li Xiang , Deng Guide , Huang Qianghua 
Published: November 2022

Abstract
With the development of hydrogen fuel cell vehicles, Carbon Fiber Wrapped Cylinder with Aluminum Liner are widely used in the field of the on-board storage of compressed hydrogen. Impact damages are common in Carbon Fiber Wrapped Cylinder with Aluminum Liner because the composite laminate structure is sensitive to impact load. In this work, the DR method with the technology of compensation block is used to detect impact damage of Carbon Fiber Wrapped Cylinder with Aluminum Liner, and analyzes the expansion of impact damage after different number of pressure cycles. The main damage of Carbon Fiber Wrapped Cylinder with Aluminum Liner caused by impact are delamination of carbon fiber overwrap, debonding between cylinder liner and carbon fiber overwrap, and bulge inward of aluminum liner, and these damages become more serious as the impact energy increases from 500 J to 1500 J. As the pressure cycle test is performed to the Carbon Fiber Wrapped Cylinder with Aluminum Liner, the impact has a serious effect on the fatigue performance of the cylinder. In addition, the debonding between the cylinder liner and the carbon fiber overwrap and the bulge inward degree of the aluminum liner are reduced due to the internal pressure. When the impact energy is low (i.e., 500 J), the pressure cycle has no significant influence on the delamination defect of carbon fiber overwrap. Besides, under the high impact energy conditions (i.e., 1000 J and 1500 J), the delamination defect of the overwrap in the impact center appears obvious expansion with the pressure cycle, while the delamination defect at the impact edge does not propagate obviously.
Reconstruction of Phased Array Ultrasonic Testing Image of Through Hole Based on Finite Element Analysis
Authors: Feng Ying , Fang Haiqing , Guo Weican , Jiao Di , Shi Jianfeng 
Published: November 2022

Abstract
As a most feasible defect detection method, phased array ultrasonic testing (PA-UT) plays an important role in nondestructive testing of pressure vessels and piping for its high detection efficiency. It’s necessary to obtain the size and position of defects or features for safety assessment to ensure the safe running of equipment if there is a defect. However, PA-UT suffers from image distortion due to acoustic attenuation and dispersion, as well as problems with imaging principle, which usually leads to errors when measuring the size and position of detected features. In this paper, the standard polyethylene block with a through hole was tested by PA-UT and the PA-UT images of artificial defects were obtained. At the same time, the PA-UT images were simulated by combining finite element analysis of the PA-UT process as well as the ultrasonic imaging algorithm. By comparing the test results and simulation results, the influence of sector scan angle and the number of elements in the active aperture on image distortion was analyzed. Moreover, based on the simulation method, the PA-UT images were post-processed to eliminate the distortion and reconstructed to be closer to the real size. This method could be further used for improving the imaging quality of the PA-UT testing system.
Comparison of Technical Standards Between Buried and Above Ground Polyethylene Pipe in the Application of Nuclear Power Plant
Authors: Shi Jianfeng , Cao Yuhua , Jiao Di , Yu Fa , Li Yu , Jiang Jiayin , Zheng Jinyang 
Published: November 2022

Abstract
High-density polyethylene (HDPE) pipes have been used in essential service water (ESW) systems of nuclear power plants (NPP) for years. Some NPPs use buried HDPE pipes, while some others use above ground (gallery-installed) HDPE pipes, and this paper will discuss the differences in the design methods of these two construction methods in related technical standards. The design requirements and related load types of buried and above ground HDPE pipes in safety-related Class 3 service water or cooling water piping systems are compared. Pipeline models under different load types are introduced, including model assumption, material simplification, boundary conditions, interactions, etc. The differences in design loads are summarized, i.e., soil and surcharge load, negative internal pressure, flotation due to flood of buried HDPE pipe, and axial forces due to different supporting or fixing methods of above ground HDPE pipe. The design methods of buried and above ground HDPE pipeline are discussed and compared, i.e., design of mechanical load, temperature load, non-repeated anchor movements and seismic load. A case study is presented by using different technical standards of buried and above ground HDPE pipes. This work can provide a reference for the selection of HDPE pipes for safety-related Class 3 service water or cooling water piping systems in different NPPs.
Experiment Study on Acoustic Emission of Different Energy of Impact-Damaged Fully-Wrapped Composite Gas Cylinders With Non-Metallic Liner
Authors: Cheng Liang , Li Qinghua , Cui Dongliang , Bo Ke , Li Xiang 
Published: November 2022

Abstract
With the rapid development of clean energy, type 4 cylinders will be widely used in the world due to their many attractive advantages. Impact damage, cuts and abrasions are the common damage modes of type 4 cylinder. Impact damage affects the safety of cylinders, but few studies are involved in the assessment of impact damage for type 4 cylinders.
In order to evaluate the safty state of cylinder with impact damage, drop tests and burst tests were carried out for type 4 cylinders. The effect of different degree of impact damage to cylinder burst pressure cylinder was obtained. AE tests were carried out on undamaged cylinder and impact-damaged cylinders with different impact energy. The essential characteristics of AE signals for different energy levels of impacted cylinders were obtained.
The results showed that there was a critical impact damage at which cylinder burst pressure started to decrease. There were obvious changes of AE test results when peformed on impacted cylinders with different impact energy. AE cumulative hit number correlated well with the degree of impact damage of type 4 cylinder. AE cumulative hit number and signal energy were two critical parameters for evaluating the cylinder with impact damage. It demonstrated that AE test was efficient and could be used to differentate a cylinder which has a loss of key performance resulted from impact damage.
Data-Centric Structural Integrity Assessment and Risk-Informed Asset Management Using Operational Data and Probabilistic Updating
Authors: Martin Michael , Marshal Robert , Reed Peter 
Published: November 2022

Abstract
The UK EASICS (Establishing Advanced Modular Reactor Structural Integrity Codes and Standards) programme has developed guidance to inform the development of codes and standards for application to the structural integrity assessment of future high-temperature designs [1]. A key aspect of the EASICS guidance describes the use of probabilistic methods in the context of a data-centric approach that can use data from all stages of the product lifecycle from design and manufacture through operation, maintenance and decommissioning to update the structural integrity assessment.
This paper provides a summary of the EASICS data-centric approach before focusing on the operational phase of the product lifecycle and the use of data derived from plant monitoring and In-Service Inspection. The numerical analysis of a prototypical geometry with a postulated initial defect and set of simulated operational histories is used to demonstrate how such data can be used to manage the future inspection strategy on a risk-informed basis. A starting point of a required number of operational events, but unknown and arbitrary future operational sequence of events is considered.
The structural reliability is calculated and updated through-life using the Monte Carlo random sampling method in conjunction with a selection of probabilistic updating techniques, including Bayesian inference.
An Active Magnetic Saddle Based on Electro-Permanent Magnetic Adhesion Mechanism
Authors: Zhang Hongsheng , Li Yanbin , Guo Kai , Jiang Jianxv 
Published: November 2022

Abstract
In this paper, a novel transport technique for pressure vessels based on electro-permanent magnet (EPM) technology is proposed. The magnetic force and the resulting transport gripping force (TGF) are applied by controllable permanent magnets rather than conventional electromagnet or permanent magnet technology, and the current is only required at the moment of loading or unloading the TGF. The EPM system is convenient in control, and low in energy consumption. The experimental device including magnetic chuck, web of foundation girder and other components is constructed based on the EPM characteristics and requirements of transported equipment. The EPM units are used to generate magnetic force to realize loading and unloading of TGF. The principles and advantages of EPM transport technique are first elaborated with theoretical derivation and magnetic field simulation. Then, a series of experiments such as electrical circuit, magnetic field and tensile test were performed for the EPM chuck and magnetic saddle. It is demonstrated that the TGF applied by the designed system is large enough for the transportation of the pressure vessel. Also, the energy saving is significant using the EPM transportation system.
Effect of Normalizing Cooling Rate on Impact Toughness of ASME SA – 350 LF2 CL1 Forgings
Authors: Hernández Soto R. , Gómez de Salazar J. M. 
Published: November 2022

Abstract
This paper intends to contribute to a better understanding of how normalizing cooling rate affects toughness of SA – 350 LF2 Class 1 forgings. This is a sensitive material widely used in pressure vessels fabrication when toughness requirements are applicable.
Three pieces from the same forging were normalized at 870°C for two hours. Each of them was subjected to a different cooling rate from normalizing to room temperature, being the temperature in the center of the piece registered by thermocouples every two seconds. Test specimens were extracted for impact testing at −46°C and metallographic examination. Subsequently, the normalized samples were cut out in two and subjected to two simulated post weld heat treatment at 630°C. Further specimens for metallographic characterization and impact testing were taken.
It can be concluded that normalizing cooling rate has a pivotal role in the morphology of pearlite, and hence in its ability to offset the deterioration of toughness in the post weld heat treatment due to iron carbide precipitation by means of pearlite spheroidization.
Ductile Tearing Prediction of Ferritic Pipes by GTN Model for ATLAS+ European Project (Report 2)
Authors: Kumagai Satoshi , Hojo Kiminobu , Hirota Takatoshi , Kawanishi Keiji 
Published: November 2022

Abstract
The European project “Advanced Structural Integrity Assessment Tools for Safe Long Term Operation (ATLAS+)” is aiming to achieve a reasonable balance between safety and long term operation of nuclear reactor pressure coolant boundary systems. In the project, the Work Package 3 deals with development and validation of finite element analysis (FEA) using the Gurson-Tvergaard-Needleman (GTN) model to predict a ductile crack growth behavior of a pipe structure from those of laboratory specimens such as SE(T) and C(T) specimens. By using the parameter sets of the GTN model obtained by other members in the project, the authors predicted the fracture behaviors of three pipes with a circumferential through-wall crack or a circumferential outer surface crack by the four-point bending test conducted by a member of the project. As a result, the predicted maximum loads agreed with those of experiments within the error of 2.2 %, and the predicted ductile crack growth amounts were nearly equal to those on the fractured surface. In addition, the J-resistance of the pipe with a though-wall crack was calculated by the FEA by the node release technique with a crack growth criterion according to the crack growth predicted by the GTN model. Consequently, the J-resistance of the pipe is 3.1 to 3.6 times larger than that of C(T) specimens, which means that a prediction by the conventional fracture mechanics has a lot of margin to the actual fracture behavior.
Fatigue Crack Growth Prediction of a Pipe With a Circumferential Surface Flaw Using ΔJ and Reference Stress Method
Authors: Hojo Kiminobu , Kumagai Satoshi 
Published: November 2022

Abstract
Fatigue crack growth calculation method beyond ΔK in codes and standards, like ASME Sec. XI or JSME rules for Fitness for Service has not been established even in Mode I. In the FDF-II Subcommittee of the nuclear research committee of the Japan Welding Engineering Society, an evaluation procedure for fatigue crack growth beyond small scale yielding using ΔJ has been investigated for several years. Since the evaluation procedure in the Subcommittee is to be incorporated into codes and standards, it should not be complex. Therefore the reference stress approach was tried to apply to calculate J-integral as a simplified procedure. Several formulae for J-integral calculation based on the reference stress approach were proposed by researchers. The authors joined the Subcommittee and performed finite element analyses for a sample problem to confirm the accuracy of those formulae, which were for a pipe with a circumferential part-through wall flaw subjected by bending load. The reference stress-based J, whose accuracy was confirmed by the authors, was applied to predict crack growth behaviors of pipes with a circumferential surface flaw under cyclic bending load conducted by other researches a decade ago. The difference of the failure cycles between the prediction and the experiment were nearly within a factor of 2. Since the verification of the simplified procedure was performed for just one case, more verification cases were needed to incorporate the procedure into codes and standards.
Study on the Manufacturing and Failure Modes of Type Ⅳ High-Pressure Hydrogen Vessel Liner
Authors: Kang Qiubing , Kuang Jiyong , Hua Zhengli , Li Yifan , Chen Weifeng , Peng Wenzhu 
Published: November 2022

Abstract
With the development of the hydrogen energy industry, type IV hydrogen vessels are widely used in hydrogen fuel cell vehicles, hydrogen storage for stationary and transportation due to their advantages of light weight, high hydrogen storage mass ratio and fatigue resistance. The, type IV hydrogen vessel is composed of a polymer liner, and carbon fiber impregnated with thermosetting resin is wound on the liner. The manufacturing process of polymer liner will affect the performance and forming cost of type IV hydrogen vessels. When pressurized, due to the hydrogen permeability of polymer materials, hydrogen will penetrate and dissolve into the material, and then emptying will cause the pressure difference between the interface between the liner and the composite material layers and the inside of the vessel, which may result in polymer liner blistered or collapsed. The current status of foreign molding process that may be used for the type IV hydrogen vessel polymer liner is firstly summarized. Then, according to the failure modes of type IV hydrogen vessel, the related experimental research, finite element analysis method and failure prediction model are summarized and analyzed, and the factors affecting blistering and collapse are discussed. Finally, further research on blistering and collapse failure of the type IV hydrogen vessel liner is prospected.
FEA Validation and Refinement of Alternative Nozzle Reinforcement Rules for Gasketed Plate Heat Exchangers
Authors: Nikic Milan , Srnic Djordje 
Published: November 2022

Abstract
This paper is an expansion of previously developed alternative nozzle reinforcement rules for gasketed plate heat exchanger (GPHE) end plates. The previous work on the alternative reinforcement rules for GPHE has been conducted by analytical means utilizing the basis of ASME BPVC Section VIII, Div. 1, Section UG-39, and the principles and data of a simply supported plate theory. As a part of the initial work, some assumptions had been left to be validated by Finite Element Analysis (FEA). The objective of this paper is to conduct the FEA validation of those assumptions and to further refine and expand the alternative reinforcement rules for GPHE.
The results of FEA show a good agreement with the initially developed analytical rules. The rules have further been expanded utilizing the same principles developed in the initial work and using additional data obtained by FEA. The expanded alternative reinforcement rules for GPHE, while being limited to the range of plate length to width ratio, are useful analytical means for design of GPHE end plates that may be used in lieu of more costly proof testing or FEA. In addition, the alternative reinforcement rules evaluate the reinforcement in the vicinity of nozzle openings resulting in an optimized design thickness of the GPHE end plates.