杭州交通信息网苏州自动打包机:英语达人帮忙～～
来源：百度文库 编辑：杭州交通信息网 时间：2024/04/29 08:44:05
（DHC）==延迟氢化龟裂
CANDU(CANada Deuterium Uranium) =加拿大氘铀核反应堆
Delayed hydride cracking(DHC) in Zr-2.5Nb allay material is of interest to the CANDU(Canada Deuterium Uranium)industry in the potential to initiate DHC at a blunt flaw in a CANDU reactor pressure tube. The material is susceptible to DHC when there is diffusion of hydrogen atoms to the flaw, precipitation of hydride platelets, and development of a hydrided region at the flaw root. The hydrided region can then fracture to the extent that a crack forms, and is able to grow by the DHC crack growth mechanism. The existing CANDU blunt flaw DHC evaluation procedure is based on a threshold peak flaw-tip stress for DHC initiation that is independent of flaw geometry. Work is underway to improve the existing blunt flaw DHC evaluation procedure by developing a methodology that takes into account the effect of flaw geometry parameters. This methodology can, in principle, be applied to any flaw that is found during in-service inspection. The methodology is base on representing the stress relaxation due to hydride formation, and crack initiation, by a process zone. This approach has been used successfully in other engineering application. A description of how the process-zone methodology can be used to quantify the effect of flaw geometry on the threshold peak stress for DHC initiation is provided. A model that is suitable for actual engineering applications is described, and the engineering model illustrates the dependency of the threshold peak stress for DHC initiation on flaw geometry. Agreement model prediction and experimental results is reasonable. Various aspects of the DHC initiation problem that are being addressed, in addition to flaw geometry, are described.
CANDU(CANada Deuterium Uranium) =加拿大氘铀核反应堆
Delayed hydride cracking(DHC) in Zr-2.5Nb allay material is of interest to the CANDU(Canada Deuterium Uranium)industry in the potential to initiate DHC at a blunt flaw in a CANDU reactor pressure tube. The material is susceptible to DHC when there is diffusion of hydrogen atoms to the flaw, precipitation of hydride platelets, and development of a hydrided region at the flaw root. The hydrided region can then fracture to the extent that a crack forms, and is able to grow by the DHC crack growth mechanism. The existing CANDU blunt flaw DHC evaluation procedure is based on a threshold peak flaw-tip stress for DHC initiation that is independent of flaw geometry. Work is underway to improve the existing blunt flaw DHC evaluation procedure by developing a methodology that takes into account the effect of flaw geometry parameters. This methodology can, in principle, be applied to any flaw that is found during in-service inspection. The methodology is base on representing the stress relaxation due to hydride formation, and crack initiation, by a process zone. This approach has been used successfully in other engineering application. A description of how the process-zone methodology can be used to quantify the effect of flaw geometry on the threshold peak stress for DHC initiation is provided. A model that is suitable for actual engineering applications is described, and the engineering model illustrates the dependency of the threshold peak stress for DHC initiation on flaw geometry. Agreement model prediction and experimental results is reasonable. Various aspects of the DHC initiation problem that are being addressed, in addition to flaw geometry, are described.
延迟在 Zr-2.5 Nb 中弄碎 (DHC) 的氢化物使材料镇静是与 CANDU(加拿大氘铀) 有相关潜能的工业在 CANDU 反应者压力管的一个钝的缺点开始 DHC。 当在缺点根有对被氢化物的区域缺点，氢化物血小板的坠落和发展的氢原子的散布时候，材料易于 DHC 。那然后被氢化物的区域能破碎到那范围一个裂缝藉着 DHC 形成, 而且能够生长弄碎生长机制。钝的缺点 DHC 评估程序以一个门槛山顶缺点为基础的现有 CANDU-顶端为与缺点几何学无关的 DHC 开始强调。 工作是进行藉由发展一种进入帐户缺点几何学叁数的效果之内轮流的方法学改善现有钝缺点 DHC 评估程序。 这一种方法学能,大体而言 ,被适用于在服勤中的检验期间被发现的任何缺点。被一个程序地域方法学以由于氢化物形成表现压迫力松弛为基础, 而且弄碎开始。 这方式已经成功地被用于其他的工程申请。 程序- 地域的方法学能如何用来定量缺点几何学对门槛山顶压迫力的效果描述因为 DHC 开始被提供。 一个对真实的工程申请是适当的模型被描述，而且工程模型对于在缺点几何学方面的 DHC 开始举例说明门槛的属国山顶压迫力。 协议模型预测和实验的结果是合理的。 正在被向～演说的 DHC 开始问题的各种不同方面, 除了有缺点几何学之外,被描述。