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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Model Experiments to Determine the Stiffness of Joints in Graphite Reactor Cores
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Model Experiments to Determine the Stiffness of Joints in Graphite Reactor Cores

机译：确定石墨反应堆堆芯接头刚度的模型实验

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摘要

The cores of Advanced Gas-Cooled and Magnox nuclear reactors consist of an assembly of graphite bricks. The bricks are normally only loaded by gravitational forces. However, in the event of a seismic event the brick assembly can be subjected to high tangential forces. An important part of the reactor safety case is an assessment of the stability of the core under these tangential forces. Any mechanics based model of the core requires parameters to describe the stiffness of the interface between a pair of bricks in order to determine their deflection. In this work model experiments have been set up to determine the stiffness of typical graphite brick contacts using ultrasonic reflection. Two graphite specimens are pressed together and the reflection signal measured. Simple acoustic wave modelling is used to determine the stiffness from the reflection at each ultrasonic frequency. This method determines the stiffness of the interface in isolation from bulk effects. This data is used in conjunction with a brick tilting model to determine the effect the interface has on the brick deflection behaviour. Results are compared with experiments on the tipping of a full size brick. The interface stiffness approach under-predicts the deflection a brick undergoes. This is thought to be due to the fact that the ultrasonic method gives a stiffness based on small scale roughness and will not account for large scale waviness of the brick surface which may have a large effect on brick tipping behaviour.
机译：先进气冷和Magnox核反应堆的核心由石墨砖组成。砖块通常仅在重力作用下加载。但是，在发生地震的情况下，砖组件可能会承受较高的切向力。反应堆安全案例的重要部分是评估在这些切向力作用下堆芯的稳定性。任何基于力学的岩心模型都需要参数来描述一对砖之间界面的刚度，以确定其挠度。在该工作模型中，已经进行了实验，以通过超声反射确定典型石墨砖触点的刚度。将两个石墨样品压在一起，并测量反射信号。简单的声波建模用于确定每个超声频率下的反射刚度。该方法确定了与刚度效应隔离的界面的刚度。该数据与砖块倾斜模型一起使用，以确定界面对砖块变形行为的影响。将结果与全尺寸砖的倾翻实验进行了比较。界面刚度方法低估了砖的变形。认为这是由于以下事实：超声方法基于小尺度的粗糙度给出了刚度，并且没有考虑到砖表面的大尺度起伏，这可能对砖的倾倒行为产生很大的影响。

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