bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Impact of Perforation on the Fracture Propagation of Horizontal Well Multistage Fracturing in the Roof of Broken Soft Coal Seams
Authors: Li Xuejiao , Zhao Haifeng , Liu Changsong , Zhong Junbing , Wang Chaowei , He Yalong 
Published: November 2022

Abstract
Horizontal well multistage fracturing in the roof of low-permeability and broken soft coal seams has proven to be an effective technique to extract coalbed methane. However, fracture propagation behaviors under this technology vary significantly with different perforation patterns. Therefore, based on the 5# coal seam in Hancheng block of Ordos Basin in China, large-scale true triaxial hydraulic fracturing physical simulation experiments were performed using the “roof-coal-floor” similar material pouring model to optimize the perforation pattern. The fracture propagation behaviors and pressure curves characteristics of horizontal well multistage fracturing in the roof of coal seams with spiral perforation, double lateral downward perforation with a phase angle of 120° and vertically downward oriented perforation were investigated respectively. The experimental results show that a relatively simple fracture network covering half of the area of the coal seam was formed by spiral perforation fracturing. A 3D complex fracture network with good connectivity in the coal seam was generated by fracturing with double lateral downward perforation. A horizontal fracture with a small zone in the coal seam was induced by vertically downward oriented perforation fracturing. Finally, double lateral downward perforation with a phase angle of 120° is considered the optimal perforation pattern due to the desired fracturing effect and relatively low cost. The presented findings can provide references for the fracturing design of horizontal well multistage fracturing in the roof of low-permeability and broken soft coal seams.
Comparison of a Datum Temperature Calibration Method With Traditional Approach for Norton Power Law
Authors: Haque Mohammad Shafinul 
Published: November 2022

Abstract
Methods for minimum-creep-strain-rate prediction have evolved. Many models have been proposed, and different calibration techniques are used. Often the limitation of these models for accurate prediction arises due to a lack of long-range data incorporating both the low-stress and high-stress regions. This problem is more prominent for novel materials with very little data and may require long-term creep tests, delaying the material’s qualification. Model calibration against short-range data may lead to an inflection during extrapolation. In this study, a datum temperature (DT) calibration method derived from Parametric Numerical Isothermal Datum (P-NID) is compared with the traditional calibration approach for minimum-creep-strain-rate prediction using Norton power law. Minimum-creep-strain-rate data for Inconel 617 at five temperature levels (800 to 1000°C) and stress ranging from 11 to 122 MPa are used. Two different forms of the Norton power law are calibrated using the traditional approach and the most suitable form for Inconel 617 is selected. Next, the model is calibrated using the datum temperature calibration approach. In the datum temperature method, the data from different temperatures are transferred to a datum temperature creating a wide range of parametric data followed by model calibration against the transferred data at datum temperature. Finally, the model is transferred back to the original temperatures. The traditional approach and datum temperature method results are compared in terms of accuracy, calibration techniques, extrapolation, and limitations for Inconel 617. The datum temperature method is found to be accurate, like the traditional approach, however, requires comparatively less effort during calibration since the model is calibrated against a single temperature instead of multiple temperatures. Thus, the material constants are independent of temperature and stress resulting in stable, inflection-free, and reliable extrapolation over the traditional approach. A step-by-step procedure is provided to derive the datum temperature transformation equations and the calibration method. Finally, a general guideline is provided to apply the datum temperature method to any existing models.
Direct Method-Based Probabilistic Structural Integrity Assessment for High-Temperature Components Considering Uncertain Load Conditions
Authors: Wang Xiaoxiao , Ma Zhiyuan , Chen Haofeng , Luan Weiling 
Published: November 2022

Abstract
Excessive dependence on the safety factor of deterministic analysis leads to the conservative design of industrial components, resulting in conspicuous waste of manufacturing resources. The novel strategy for probabilistic assessments for structural integrity is proposed based on the direct method, Linear Matching Method (LMM) framework, a series of structural integrity analysis approaches, where the uncertain design conditions are taken into consideration. To address complicated failure modes under high-temperature, the probabilistic LMM (pLMM) framework consists of six modules, including shakedown analysis, ratcheting analysis, direct steady cycle analysis (DSCA), the unified procedure for fatigue and ratcheting analysis (UPFRA), creep rupture analysis and creep-fatigue analysis. Leveraging the load multiplier calculated by LMM, a general form of performance function is constructed that defines the limit state of different failure modes. Besides, the iteration algorithms of the first-order reliability method (FORM) is formulated to acquire the reliability index and failure probability. With different failure modes discussed, the numerical cases demonstrate the application of the proposed probabilistic structural integrity analysis, with corresponding failure risk and reliability index calculated. The pLMM-based reliability analysis can be introduced into the current structural integrity assessment procedures, which is conducive to replacing traditional safety factors, reducing risks and improving structural robustness.
A Review on the Effect of Heat Treatment for Thermoplastic Composites
Authors: Shang Ningtao , Yao Riwu , Wu Jinkui , Kong Zhiyong , Zheng Jinyang , Shi Jianfeng 
Published: November 2022

Abstract
Thermoplastic composites have recently attracted broad attention in aerospace, transportation, shipping, and other fields for their excellent mechanical properties and high recyclability. However, the properties of thermoplastic composites are unstable because of the problems such as microstructural differences and residual thermal stress after molding processing. Therefore, heat treatment, as a common method to modulate the microstructure and improve the properties of materials, is used to solve the problems. In this paper, the effects of different heat treatment methods were reviewed, including oven heating, microwave heating, and electric heating on the properties of various types of thermoplastic composites. The changes in material properties i.e., phase transformation, residual stress, interface bonding properties, etc. were discussed. Based on these investigations, electric heating experiments were carried out on the damaged samples of short carbon fiber reinforced polyethylene (SCFRPE) composites, and the mechanical properties of the samples before and after electric heating were analyzed. The results showed that the toughness increased, while the strength decreased after electric heating. These phenomena may be related to the changes of crystallinity and interfacial shear strength of the composites. This study can provide a reference for the manufacturing of SCFRPE based structures.
Numerical Study of Hydrogen Leakage and Explosion in Hydrogen Refueling Station With Large Volume Hydrogen Storage Vessels
Authors: Lu Chen , Hu Jieyi , Ye Sheng , Gu Chaohua , Hua Zhengli 
Published: November 2022

Abstract
Large volume multi-layered high pressure hydrogen storage vessel is one of the vital equipment in hydrogen refueling station. However, the possibility of leakage from container nozzles during service remains a safety concern. In this paper, a leakage model modified by the real gas equation of state and a three-dimensional (3D) computational fluid dynamics (CFD) model based on the real hydrogen refueling station layout are established to simulate the whole process of hydrogen diffusion and explosion after the large volume vessel leak. The influences of leakage direction, leakage height, hydrogen storage pressure and wind speed on the distribution of flammable hydrogen are studied, as well as the scope of overpressure harmful area is respectively predicted when the real hydrogen cloud is ignited at different times. Results indicate that the high-pressure hydrogen jet over 30MPa diffuses in a wide range near the surface under momentum control. And the smaller the leakage source height is, the more obvious the Coanda effect is. In addition, igniting after hydrogen leakage in a very short time (such as 0.5 s) will lead to higher maximum overpressure, and igniting after a long time will form a larger dangerous area. Compared with the seamless hydrogen storage cylinder group, the hydrogen explosion hazard of vertical large volume multi-layered hydrogen storage vessel is significantly alleviated after leakage. Also, setting a certain height of isolation walls outside the hydrogen storage area can effectively reduce the risk and consequences of accidents.
Numerical Analysis on the Blast Field From Gas Pipeline Burst Considering Fluid-Structure Interaction
Authors: Ren Yi , Du Yang , Zhou Fan 
Published: November 2022

Abstract
The blast wave propagates into the surrounding air when the high-pressure gas pipeline burst. Both temperature and pressure increase very rapidly. The generation of the blast wave and structural dynamic fracture are tightly coupled together during the burst of the high-pressure gas pipeline. However, fracture behavior and characteristics that influence blast waves’ intensity and spatial shape are rarely studied. This paper establishes a numerical model incorporating strain-based failure criteria for pipe material and fluid-structure coupling algorithm. The dynamic crack growth of the pipe and the outer blast wave propagation can be successfully captured in every timestep. The model is validated by comparing the simulated explosion pressure history and peak overpressure outside the pipeline with the experimental results. The blast wave intensity changes and the distribution of overpressure in the jet direction are clarified. Then some critical parameters of the resulting fracture and blast wave are examined, such as the pipe diameter and wall thickness. Specifically, the relationship between pipe fracture and the generated blast field is discussed, providing a deeper understanding of this highly transient and strong fluid-structure interaction problem. The results would benefit the prediction and accident investigation of high-pressure gas pipeline rupture.
Experimental Study of Fluid Forces on Direct-Acting Relief Valves
Authors: Li Qingye , Zong Chaoyong , Liu Fuwen , Zhou Weihao , Song Xueguan 
Published: November 2022

Abstract
Safety valves as the last barrier of the pressure vessel and piping system ensure the stability of the whole system. However, there are specific situations where valves may not operate properly, which can have a significant impact on the safety of the entire system. The reason for this is a lack of understanding of the dynamic characteristics of valves, of which fluid forces are the most critical factor. In this paper, a high-precision test rig was built to test steady-state fluid forces of a direct-acting relief valve, where proportional-integral-derivative control (PID) control was applied in order to obtain more accurate multi-stage flow rates adjustments. In addition, a adjustment mechanism has been designed to obtain a more accurate valve opening. Based on this test rig, the steady-state fluid force at different openings and different flow rates are conducted, the relationship between fluid forces, flow rates and pressure drop of the valve is analyzed from the test data, which provide an in-depth understanding of the dynamic characteristics of the valves.
First Large Scale Shaking Table
Authors: Minowa Chikahiro , Nakamura Izumi , Furuya Osamu 
Published: November 2022

Abstract
The large-scale shaking table in Tsukuba owned by National Research Center for Disaster Prevention, which was completed in 1970 after the 1964 Niigata Earthquake, will be closed in 2022. The table has an area of 15m × 15m and a exciting force of 360tons. The table was called as first large-scale shaking table. In 1970, the table was completed as one direction shaking table horizontal or vertical switching with stroke 60mm. In every year, several experiments were conducted. In 1988, the shaking table performance was improved. After Kobe Earthquake Damage, many shaking tables of high performance have been constructed. And it became clear that the seismic records exceeded 10m and 3m/s. Considering this situation, it must be said that the performance of the Tsukuba shaking table, which has been 50 years since its completion, has become difficult to meet the demands of the times.
In this paper, it will be described the process of determining the construction specifications for the Tsukuba Shaking Table and the results of the main experiments conducted over 50 years, and this is the final word.
Finite Element Numerical Simulation of Hydrogen Storage Vessel Under Dynamic Load Impact
Authors: Fang Zhou , Shi Puan , Wang Zhe , Wu Gang , Liu Qia , Wang Yongming 
Published: November 2022

Abstract
With the development of global society and the progress of technology, hydrogen energy is gradually becoming an emerging clean energy source. As a special high-pressure container for storing hydrogen, damage to the hydrogen storage vessel under the impact of dynamic load can cause serious accidents. In order to study the mechanical property changes of hydrogen storage vessel under dynamic load, this paper adopts the equivalent static method to numerically simulate the steel hydrogen storage vessel and analyze the effects of load size and impact location on the stress-strain of hydrogen storage vessel under dynamic load impact, so as to provide theoretical basis for the analysis, evaluation and design of hydrogen storage vessel’s crashworthiness.
Development of a Pressure Vessel Qualification Methodology and Testing - Proposal Enhancement to ASME BPVC Certification
Authors: Josodipuro Irawan 
Published: November 2022

Abstract
Pressure vessels play important roles in pressurized static equipment systems. In the oil and gas industry, for example, they are used to perform the process function, separation, filtration, and storage. Given the role of pressure vessel, which is subject to elevated pressure, temperature, and fatal accidents have occurred in the history of pressure vessel, it is important that pressure vessel end-users feel confident that the pressure vessel they procure meet the safety requirements. This paper presents a case study where there have been breakdowns in the qualification of pressure vessels being offered by pressure vessel suppliers to the industry that did not comply with industry standards which can adversely impact plant operations and personnel safety. The loss of pressure vessel supplier credibility is a concern that may rarely occur in mature economies but seem to be more prevalent in countries where qualification standards are either relatively new or non-existent. To address this issue, the author presents a systematic approach that can be used to ensure that pressure vessels supplied to end-users in oil and gas industries in emerging countries meet the design requirements and standards they are required to meet. The process used to control the manufacturers begins with a qualification plan which each supplier has to establish its product line. Following compliance with the qualification plan, a criticality matrix is introduced to the manufacturers that classify the criticality of each pressure vessel type in the system and the associated qualification program(s) that the manufacturers need to meet. The validation with an established program has shown some merit and could be applied to all manufacturers in emerging countries to ensure consistency. The details of the qualification program used and how the process is evaluated are covered in the body of the paper together with examples of how the process has worked.
Identification and Quantitative Analysis of Defect in Plates Based on Remote-Field Eddy Current Method
Authors: Zhang Hongsheng , Chang Jinpeng , Pan Wenjie , Sun Chencan , Guo Kai 
Published: November 2022

Abstract
Remote-field eddy current testing (RFECT) technology breaks through the limitation of skin effect. It has shown its advantages over the other electromagnetic non-destructive evaluation (ENDE) techniques in the detection and characterization of deeper defects. In this paper, a new RFEC transducer is designed for plate defect detection. The optimal sensor design scheme is obtained by comparing and analyzing the material and composition of the sensor shield structure through numerical simulation. Then, the identification and quantitative analysis of the detection signals is studied. The defect detection experiment is carried out to prove the effectiveness of the transducer. The results show that fitting relationship between the phase of the sensor detection signal and the defect depth are the quadratic function. The defect depth can be quantitatively analyzed by the phase of the detection signal. The new designed transducer is promising in online detection of buried defects in pressure vessels and pipes.
Study on Mitigation of Sliding Motion of Cask-Canister Coupled System Subjected to Seismic Excitation Using Highly Viscous Fluid
Authors: Shintani Atsuhiko , Nakagawa Chihiro , Ito Tomohiro 
Published: November 2022

Abstract
In this study, the suppression of the sliding motions of a coupled cask-canister system was investigated using a damping device consisting of two coaxial cylinders filled with a highly viscous liquid. An analytical model describing the coupled cask-canister system connected to a damping device is presented. The sliding behavior of the coupled cask-canister system when subjected to seismic excitations was studied both with and without a damping device. The displacement of the cask was found to be suppressed in most cases. By contrast, the displacement of the canister could not be mitigated completely. However, it was found that the acceleration response of the canister could be reduced significantly if its natural frequency is sufficiently different from the input frequency of the seismic waves.
Post-Irradiation Fracture Toughness Characterization of Generation II FeCrAl Alloys
Authors: Chen Xiang (Frank) , Field Kevin G. , Howard Richard , Massey Caleb P. , Nelson Andrew T. 
Published: November 2022

Abstract
FeCrAl alloys are promising candidate materials for the accident tolerant fuel (ATF) cladding application due to their exceptional resistance to oxidation in elevated temperature steam environments. Currently, limited fracture toughness data are available for the FeCrAl alloys, including the FeCrAl alloys newly developed at Oak Ridge National Laboratory (ORNL) under the U.S. Department of Energy’s Advanced Fuels Campaign (AFC) program. In this study, two Generation II candidate FeCrAl alloys, i.e., C06M (81.8Fe-10Cr-6Al-0.03Y-2Mo-0.2Si) and C36M (78.8Fe-13Cr-6Al-0.03Y-2Mo-0.2Si), were irradiated in the High Flux Isotope Reactor (HFIR) at ORNL to assess the fracture characteristics of these alloys after neutron irradiation. A total of six rabbit capsules were irradiated in HFIR at target temperatures of 200°C, 330°C, and 500°C up to target damage doses of 8 displacements per atom (dpa) and 16 dpa. Post-irradiation fracture toughness testing was performed following the Master Curve method in the ASTM E1921 standard. The main findings of this study are:
1) Both the C06M and C36M alloys exhibited a similar response to irradiation concerning irradiation hardening and embrittlement.
2) The irradiation temperature played different roles in terms of irradiation hardening and embrittlement for both C06M and C36M: after irradiation between 166°C and 204°C, both materials exhibited significant irradiation hardening and embrittlement; after irradiation between 315°C and 343°C, both materials showed small irradiation hardening without irradiation embrittlement. After irradiation between 501°C and 507°C, however, the irradiation softening without irradiation embrittlement was observed in both materials.
3) Comparing the microhardness and Master Curve reference temperature T0q before and after neutron irradiation, we did not observe a linear correlation between the two parameters for both C06M and C36M steels. This should be mainly due to a flat response of the Master Curve reference temperature T0q to the irradiations at 166–204°C and 315–343°C ranges
4) C06M showed a lower T0q, meaning better toughness, than C36M at the unirradiated condition, and such trend was kept even after neutron irradiation except for the 166–204°C irradiation after which both materials had similar T0q.
5) In terms of hardening and embrittlement, the irradiation effect on both C06M and C36M appeared to saturate after an irradiation dose of 7 dpa.
An Investigation on Vortex Induced Vibration and Wake Induced Galloping in Tandem Cylinders System
Authors: Guo Kai , Cheng Yuxuan , Fan Xiantao , Zhang Hongsheng , Tan Wei 
Published: November 2022

Abstract
The flow-induced vibration (FIV) of multi cylinders is a problem involving the safety of fluid engineering and energy harvesting. Due to the effect of wake galloping and vortex induced vibration (VIV), the mechanism of two tandem cylinders is more complex than that of a single cylinder. In this study, the vibration modes of two tandem cylinders with different spans (L/D = 1.5–4.0) are investigated at subcritical Reynolds number and high mass damping ratio through wind tunnel tests. In the experiment, the cylinders are free to vibrate in the transverse and in-flow direction. The characteristics of the vibration amplitude and vibration frequency response are discussed with the vibration mode. The results show that the vibration mode is related to the reduced pitches between the cylinders. The vibration of the two tandem cylinder system is combines results of vortex induced vibration and wake induced galloping (WIG). When the span is lower than 2.0, the galloping effect is more obvious than that of larger spans cylinders at the experiment mass damping parameters. The two cylinders turn to vibrate separately as the span grows larger.