共查询到18条相似文献,搜索用时 156 毫秒
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以含中心圆孔边穿透裂纹的有限宽板试样模拟压力容器接管部位的应变场分布,采用弹塑性有限元方法计算回路J积分,根据裂纹尖端张开位移δt与J的转换关系,评价了CVDA设计曲线用于高应变区内小裂纹缺陷评定时的安全裕度。 相似文献
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提出了以单边椭圆孔边裂纹试板(SENCP)代替EPRI的中心圆孔边裂纹试件,更合理地模拟压力容器接管高应变梯度区应变分布场,并采用与EPRI相似的方法,以图表的形式给出了几种承受均匀拉伸载荷时的SENCP的J积分弹塑性估算解。 相似文献
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本文用电测法对3台带接管的球形容器(两台带正交接管,一台带切向接管)接管环带区的应变进行了测试,对应变分布进行了分析。认为球形容器接管环带区的峰值应变位于离焊缝较近的球壳侧,且峰值应变和压力具有线性关系。在线性条件下,对球壳侧应变的工程估算进行了探测,得出的试验式可供压力容器安全评定时参考。 相似文献
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本文用电测法对3台带接管的球形容器(两台带正交接管,一台带切向接管)接管环带区的应变进行了测试,对应变分布进行了分析。认为球形容器接管环带区的峰伍应变位于离焊缝较近的球壳侧,且峰值应变和压力具有线性关系。在线性条件下,对球壳侧应变的工程估算进行了探讨,得出的经验式可供压力容器安全评定时参考。 相似文献
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惠志全 《中国石油和化工标准与质量》2014,(11):13-14
与常规设计方法相比,应用应变强化设计的奥氏体不锈钢压力容器,可以减小容器的壁厚,达到低碳经济的目标。澳大利亚,欧洲,美国相继推出了采用应变强化技术进行奥氏体不锈钢压力容器生产的标准规范,目前中国尚无相应的标准规范;分别选取欧洲,美国及澳大利亚应变强化奥氏体不锈钢压力容器几部典型标准,从适用范围,选材,设计,制造及检测几个方面对比分析了这些标准的异同,为中国的应变强化技术应用提供参考. 相似文献
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Siva Ariyapadi Franco Berruti Ram Balachandar 《Chemical Engineering Communications》2003,190(12):1681-1704
The spray characteristics of a scaled-down version of an industrial feed nozzle are studied in the presence of a cross flow. Aerated liquid nitrogen is injected through the nozzle to generate the spray. The aeration rate is low and held constant, while two different liquid flow rates are used to produce the spray. A nonuniform wind profile is chosen to represent the cross flow condition. The droplet diameter and velocity measurements are acquired using a phase-Doppler particle analyzer. The results of the present study indicate that the spray momentum flux determines the extent of the jet bending. The droplets are accelerated significantly in the initial jet region as a result of flashing. However, further downstream of the nozzle, the vaporization of the droplets is considered to be negligible. The size-velocity correlation changes significantly for the case where the spray is shifted due to the cross flow. 相似文献
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Measurements of strain release1 showed that check results were obtained only when the previous history of the samples was the same. Moreover, it was found that the release of strain was more rapid at first than could be accounted for by the equation of Adams and Williamson. This paper discusscs the effect of previous history on the measurements, describes an improved device for loading the specimens, and suggests a logarithmic equation which, in general, fits the observations better than that of Adams and Williamson. Tests of the equation are made both on data obtained from the modified apparatus described and on the data of Adams and Williamson. It is indicated that the Adams and Williamson equation gives too long an annealing time at higher temperatures and too short an annealing time at lower temperatures. It appears that the rate of release of strain depends on some power of the strain which varies from unity at high temperatures where the glass is a viscous fluid to a higher power at low temperatures where the release of strain is elastico-viscous in character. With a siugle specimen at any fixed temperature in the annealing range, however, it appears that the release of strain in various parts of the specimen takes place at a rate which is proportional to the strain, but that the rate undergoes continual change with time. 相似文献
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网络喷嘴的射流分析与结构参数设计 总被引:1,自引:0,他引:1
通过网络喷嘴流场测定和进气孔射流的分析,得知在射流区内可分为较强的周向气流速度分量,使丝束假捻,旋转,同时有稍弱的轴向气流速度分量,使丝束前移形成网络结,其射流核心区长度约为进气孔直径的4.7倍。丝道截面形状推荐为桃形,喷嘴进气孔直径一般为1.1~2.2mm,丝道长度一般在20~45mm,丝束张力以进丝张力稍低于出丝张力10%~20%为宜。 相似文献
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王向军 《化学工业与工程技术》2003,24(6):21-23
对高压汽包简体壁侧的偏置偏心开孔接管进行三维有限元应力分析计算,并按分析设计标准对接管应力进行强度评定,用按此计算合格的偏心开孔接管对汽包进行修复。经1年多的运行,结果表明此偏心开孔接管能满足安全生产的要求。 相似文献