Investigation of fatigue performance for new membrane-type LNG CCS at cryogenic temperature

Oh, Deuk-Ja; Kim, Nam-Kyu; Song, Sangwoo; Kim, Jae Won; Kim, Myung‐Hyun

doi:10.1016/j.marstruc.2018.08.005

Cited by 17 publications

(4 citation statements)

References 9 publications

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“…As shown in Figure 17 , the average fracture tensile force (F) increased with increasing the pulse frequency, and the maximum is 11.95 kN when the pulse frequency was 15 Hz. According to relevant reference [ 35 ], the strengnth of Fe-36Ni is 430 Mpa (according to the tensile samples’ size used in this study, the Fe-36Ni strength is converted to 12040 kN). When the pulse frequency is 15 Hz, the F of the joint is decreased by 0.7% compared to Fe-36Ni.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

Wang

Shen

et al. 2020

Materials

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High-quality joining of dissimilar alloys between Fe-36Ni alloy and 304L stainless steel is essential in the manufacturing of LNG tanker. In this study, lap joints of Fe-36Ni and 304L dissimilar alloys were fabricated by a pulsed gas tungsten arc welding (P-GTAW) process. The effects of low-frequency pulse on the appearance, microstructure and mechanical properties of the Fe-36Ni/304L lap joints was investigated. With the increase of frequency, the feature sizes of α (the transition angle of the upper surface of Fe-36Ni to the surface of the weld bead) and R (shortest distance between weld root and weld surface) exhibited downtrend and uptrend, respectively, while La (the maximum weld width of lower sheet) and P (the maximum weld penetration of lower sheet) changed in a smaller range. Fusion zone (FZ) is mainly composed of γ phase and M23C6 during solidification, and M23C6 particles are distributed on the grain boundaries of the cells, which reduced the mechanical properties of joint. The average hardness between 110 HV1 and 136 HV1 is lower than that of the base metals. Fractures of all joints located at the Fe-36Ni side near the weld, and a dimple fracture in all samples indicated a ductile fracture. This study found that the heat input values remain 198.86 J mm−1 and increased pulse frequency can improve the maximum tensile force. The average maximum tensile force of the lap weld is 11.95 kN when pulsed frequency is 15 Hz.

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Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

Wang

Shen

et al. 2020

Materials

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“…In addition, in low-temperature treatment, the micro-hardness was increased from 208 VHN to 520 VHN, which is more than double that of the as-received sample [6]. Oh et al (2018) reported the low-temperature fatigue strength of 304 stainless steel was significantly improved compared to the ambient fatigue strength [7]. Thanks to these valuable studies, it has been established that 304(L) austenitic stainless steel is the optimal material in low-temperature applications because an enhanced mechanical performance was observed in terms such as strength, hardness, and fatigue strength at low temperatures.…”

Section: Introductionmentioning

confidence: 94%

A New Computational Method for Predicting Ductile Failure of 304L Stainless Steel

Kim

Choi

et al. 2022

Metals

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Austenitic stainless steel is useful for storing and transporting liquefied natural gas (LNG) at temperatures below −163 °C due to its superior low-temperature applications. This study develops a computational method for the failure prediction of 304L stainless steel sheet to utilize its usability as a design code for industrial purposes. To consider material degradation in a phenomenological way during the numerical calculation, the combined Swift–Voce equation was adopted to describe the nonlinear constitutive behavior beyond ultimate tensile strength. Due to the stress state-dependent fracture characteristics of ductile metal, a modified Mohr–Coulomb fracture criterion was adopted using stress triaxiality and Lode angle parameter. The numerical formulation of the elastoplastic-damage coupled constitutive model with fracture locus was implemented in the ABAQUS user-defined subroutine UMAT. To identify the material and damage parameters of constitutive models, a series of material tests were conducted considering various stress states. It has been verified that the numerical simulation results obtained by the proposed failure prediction methodology show good agreement with the experimental results for plastic behavior and fractured configuration.

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“…The traditional LNG temperature monitoring method usually uses an infrared thermal imaging camera [22,23] or multi-point embedded thermal resistance [24] to establish a temperature monitoring system to obtain the temperature map of the external tank, communicate the thermal imager and the computer, and process the thermal image of the storage tank. However, these methods are often affected by the sway, vibration, humid working conditions, and other aging factors on ships.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Large-Temperature-Range and Long-Period Monitoring for LNG Marine Auxiliary Based on Fiber Bragg Grating Temperature Measurement

Han

Wang

Zhang

et al. 2021

JMSE

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Temperature is a key variable to evaluate the energy consumption and thermodynamic performance of traditional marine auxiliary machinery, chillers and piping systems. In particular, for the cryogenic storage tanks and fuel gas supply systems of LNG ships, explosion-proof and low-temperature-resistance properties bring new challenges to the onboard temperature measurement and monitoring. In order to promote the development of high-performance and safer monitoring systems for LNG ships, this paper adopted fiber Bragg grating (FBG) technology to ensure the measurement safety and accuracy of temperature sensors, and performs a series of experiments in a large temperature range on the chiller, pipeline, and cryogenic storage tank of an LNG ship and their long-term reliabilities. Firstly, the principle and composition of the designed FBG temperature sensors are introduced in detail, and the measurement accuracy and range of different metal-coated optical fibers were tested in a large temperature range and compared against the traditional thermistors. Then, the effects of different operating conditions of the LNG marine chiller system and cryogenic storage tank on the temperature measurements were investigated. In addition, the drift degrees of the optical fibers and industrial thermistors were analyzed to figure out their reliabilities for long-term temperature measurements. The results showed that for the long-period (16 months) monitoring of LNG ships in a large temperature range (105–315 K) under different shipping conditions, the optical temperature measurement based on FBG technology has sufficient accuracy and dynamic sensitivity with a higher safety than the traditional thermoelectric measurement. Besides, the ship vibration, ambient humidity, and great temperature changes have little impact on its measurement reliability and drifts. This research can provide references and technical supports to the performance testing systems of LNG ships and other relevant vessels with stricter safety standards.

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Investigation of fatigue performance for new membrane-type LNG CCS at cryogenic temperature

Cited by 17 publications

References 9 publications

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

Microstructure and Mechanical Properties of Fe-36Ni and 304L Dissimilar Alloy Lap Joints by Pulsed Gas Tungsten Arc Welding

A New Computational Method for Predicting Ductile Failure of 304L Stainless Steel

Experimental Study of Large-Temperature-Range and Long-Period Monitoring for LNG Marine Auxiliary Based on Fiber Bragg Grating Temperature Measurement

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