共查询到20条相似文献,搜索用时 15 毫秒
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采用有限元方法对超薄金属内衬复合材料压力容器结构进行分析。在分析中, 几何模型中的封头段考虑了复合材料铺放角度和厚度沿平行圆半径变化, 材料模型中的复合材料层和内衬层分别选用复合材料层合板理论和弹塑性理论进行分析, 二者之间的界面变形协调性及不可贯入性引入接触分析进行考虑。数值结果表明:在工作压力下, 容器复合材料层纵向应变均为拉应变, 环向存在部分压应变, 内衬层发生塑性变形; 卸载后, 容器的复合材料层处在拉应力状态, 内衬层处在压应力状态。在此基础上, 利用容器的简化模型, 根据内衬层最大变形点荷载位移曲线实现了容器内衬层局部屈曲模拟。容器水压应变测试和内衬局部屈曲观测结果与数值模拟结果吻合较好, 验证了本文中分析的可靠性。 相似文献
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Delamination prediction of composite filament wound vessel with metal liner under low velocity impact 总被引:1,自引:0,他引:1
Based on low velocity impact kinetic theory and corresponding damage criterion for the composite laminated structures, a 3-D incompatible, geometrically nonlinear finite element method was employed to investigate the impact mechanical behavior of the composite filament cylindrical vessel with metal liner with and without internal pressure and predict their damage distributions during and after impact. A modified Hertzian contact law was used to calculate the contact force between the impact body and impacted cylindrical vessel and a direct integral scheme-Newmark method was applied in time domain during impact analysis process. The damage styles and damage distributions of a typical vessel under different impact velocities are presented. From the numerical results, it is clear that the impact damage extent for composite filament wound vessel with internal pressure is more sever than that without internal pressure under low velocity impact case with same kinetic energy. 相似文献
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R. Moskovic 《Engineering Fracture Mechanics》1988,30(6):839-861
Compact tension specimens were used to measure the initiation fracture toughness and crack growth resistance of pressure vessel steel plates and submerged are weld metal. Plate test specimens were manufactured from four different casts of steel comprising: aluminium killed C-Mn-Mo-Cu and C-Mn steel and two silicon killed C-Mn steels. Weld metal test specimens were extracted from five weld joints of Unionmelt No. 2 weld metal. The welds were of double V butt geometry having either the C-Mn-Mo-Cu steel (three weld joints) or one particular silicon killed C-Mn steel (two weld joints) as parent plate. On the upper shelf, a multiple specimen test technique was used to obtain crack growth data which were analysed by simple linear regression to determine the crack growth resistance lines and to derive the initiation fracture toughness values for each test temperature. These regression lines were highly scattered with respect to temperature and it was very difficult to determine precisely the temperature dependence of the initiation fracture toughness and crack growth resistance. The data were re-analysed, using a multiple linear regression method, to obtain a relationship between the materials' crack growth resistance and toughness, and the principal independent variables (temperature, crack growth, weld joint code and strain ageing). 相似文献
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We present experimental results of the circumferential core weld SN0.1.4 and the base metal ring 0.3.1 of the reactor pressure
vessel from the Unit 1 of the Greifswald WWER-440/230. The investigated trepans represent the irradiated–annealed– reirradiated
(IAI) condition. The working program is focused on the characterization of the reactor pressure vessel steels through the
reactor pressure vessel wall. The key part of the testing is aimed at the determination of the reference temperature T0 following
the ASTM Test Standard E1921 to determine the fracture toughness in different thickness locations. 相似文献
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《Engineering Failure Analysis》2000,7(3):169-179
A mathematical model has been developed to predict the fatigue life of Shielded Metal Arc Welded (SMAW) cruciform joints failing from toe region. High strength, quenched and tempered steel (ASTM 517 ‘F’ Grade) has been used as the base material throughout the investigation. Design of Experiments (DoE) concept has been used to optimise the required number of experiments. Fatigue experiments have been conducted in a mechanical resonance pulsator, under constant amplitude loading. The model has been developed by Response Surface Method (RSM). Analysis of Variance (ANOVA) technique has been applied to find out the significant factors. By using the developed model, the fatigue life of shielded metal arc welded cruciform joints failing from toe region can be predicted at 95% confidence level. The influences of cruciform joint dimensions on fatigue life have been analysed in detail. 相似文献
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The adhesion of thick glass-ceramic films bonded to metal substrates was measured using five different tests: tensile delamination using a bonded stud, scratch testing, an interfacial shear test, indentation and a bend test. All the tests proved to have limitations, and no test gave a fully quantitative measure of adhesion. However, the different tests did rank the samples in the same order of adhesion strength. This indicates that although a fully quantitative method of testing the adhesion of thick films has not yet been developed, many of the published tests can be used to obtain qualitative data. 相似文献
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Safe operation of nuclear power plants is one of the major concerns and relies primarily on the integrity of the reactor pressure vessel. Neutron exposure induces temperature dependent embrittlement and can lead to loss of fracture toughness of reactor pressure vessel steel. Conventional fracture mechanics suffers from a serious limitation of non-transferability of fracture data from specimen level to component level as fracture resistance data obtained is largely geometry dependant. This difficulty is largely overcome by Gurson–Tvegaard–Needleman (GTN) model which models the drop in load carrying capacity of a material with the increase in plastic strain, considering nucleation, growth and coalescence of micro-voids in the material. However, determination of the model-parameters with experiments is extremely difficult and doubtful. Hence, a parametric study was undertaken to find out the effects of different parameters on material behaviour of reactor pressure vessel steel and to asses the parameter for best practical result with least metallographic study using a hybrid approach. The model parameters were finally verified by predicting ductile fracture in compact tension and three point bend specimen made from reactor pressure vessel steel. 相似文献
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E. Vliegen S. Kadlecek L. W. Anderson T. G. Walker C. J. Erickson William Happer 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2001,460(2-3):444-450
We investigate the measurement of alkali number densities using the Faraday rotation of linearly polarized light. We find that the alkali number density may be reliably extracted even in regimes of very high buffer gas pressure, and very high alkali number density. We have directly verified our results in potassium using absorption spectroscopy on the second resonance (42S→52P). 相似文献
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压力容器上使用快开门装置越来越普遍,如何使压力容器快开门关闭和压紧后,能自动锁紧且安全可靠,一直是一项技术难题.提出一种新的纯机械控制压力容器快开门安全锁紧装置,由压紧钩、连杆、摇杆、机架及锁紧气缸组成,其中压紧钩、连杆、摇杆和机架构成了四杆机构.在容器门盖快速关闭和压紧后,利用四杆机构中的连杆和摇杆“死点”位置来锁紧,“死点”位置再由锁紧气缸锁定.该装置是借助压紧时本身的能源来实现锁紧的,压紧钩与压紧块既可压紧又能锁紧,不仅结构简单、操作方便,而且锁紧性能稳定、可靠. 相似文献