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《International Journal of Hydrogen Energy》2021,46(58):30173-30189
In a previous study [1], a resolution scheme called Generalized Oriani's Approximation (GOA) was proposed to solve a transient transport and trapping problem in the Abaqus Finite Element software. This proposition was motivated by the convergence of the Finite Element problem linked to the estimation of several functions during the computation (and especially the dudt one). In this study, the GOA is shown to be able to provide an accurate estimation of the trapped concentration in transient trapping processes as soon as the time increment is small enough for two configurations: hydrogen in metals and water in polymers. An estimation of the induced error is given. The GOA approach is illustrated on a simple configuration with various trapping parameters. Last, the ability of Abaqus to converge while modeling a transient trapping and transport problem is analyzed considering several dudt: it is shown especially that its estimation based on the GOA allows the solver to efficiently converge toward the solution. 相似文献
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《International Journal of Hydrogen Energy》2020,45(43):23122-23133
In this research, hydrogen induced cracking (HIC) phenomenon in pipeline steel has been investigated by finite element modeling (FEM) with the help of experimental observations. Abaqus software has been utilized to model the crack. To this, first an API 5L X70 pipeline steel was electrochemically charged by hydrogen for 8 h to create different types of HIC cracks. Then, SEM was used to observe different types of hydrogen cracks. Based on the observations, most of HIC cracks were observed at the center of cross section where center segregation of some elements occurred. The results showed that HIC cracks propagated in stepwise, sinusoidal, straight and disordered manner. Moreover, HIC crack nucleated from a point with high stress concentration factor which was between non-metallic inclusion or void and metal matrix. The initiated micro-cracks from two neighbor inclusions link together to form a long HIC crack. Based on the experimental observations and FEM modeling, it was concluded that the driving force for the HIC crack propagation is the presence of hydrogen at the crack tip after it is initiated. Crack tip usually acts as a very small void and the combination of hydrogen atoms makes a high pressure which propel the crack forward. Moreover, the HIC crack propagation path was predicted by fracture mechanics approach showing that the J-integral had its maximum amount when the HIC crack tended to propagate horizontally. 相似文献
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在对比汽车传动轴传统单端压装和两端压装的基础上,使用有限元软件Abaqus对汽车传动轴过盈压装进行有限元模拟仿真,通过分析不同工艺参数如过盈量、轴管长度、不同过盈组合形式等对传动轴支反力RF,轴管径向塑变U1和轴向应力S33的影响,对传动轴压装工艺进行论证。 相似文献
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以北京市某地铁车站Y形钢管混凝土柱为工程背景,在对其进行拟静力试验的基础上,利用大型通用有限元软件Abaqus对缩比试验模型进行建模和分析,并将计算模型得到的骨架曲线、柱底应力和应变、Y形铸钢部分应力与试验结果进行对比分析,得到结论:1)模拟计算结果与试验结果基本吻合,有限元模拟有一定的可靠度,可为实际设计及施工提供参考,也可为以后研究提供借鉴。2)根据结果推测,柱底仍是试件最薄弱部位。3)提出扩大模型范围研究,对结构进行设计优化和通过等效简化模型来提高其精确度的展望。 相似文献
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基于Abaqus软件建立大型注聚泵作用下注聚平台动力响应分析模型,探究注聚泵布置方式、开启数量、启动间隔等参数对注聚平台振动特性的影响规律。基于被动隔振原理提出一种迷宫式约束阻尼隔振基座用于降低平台的振动,并采用数值方法对该约束阻尼隔振基座的隔振效率进行研究。结果表明,注聚平台的振动响应会随着注聚泵开启数量的增加呈现线性增长趋势,不同启动间隔可导致注聚泵机振动载荷相互抵消,从而导致注聚平台振动响应大幅降低,而迷宫式约束阻尼隔振基座可显著降低注聚平台多个自由度的振动响应,其隔振效率可达20%。 相似文献
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在体壳单元组合有限元模型中,由于实体元与壳元的自由度不同,使得转动自由度不连续,计算结果往往与实际偏差很大。 Abaqus中提供了一种多点约束法来实现三维实体元与壳元正确联接,阐述了其原理,并通过实例对两种单元联接参数设置的不同进行结果对比,给出了合理的处理方法,为有限元分析中体壳单元耦合及模型简化提供指导与借鉴。 相似文献
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