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首页> 美国卫生研究院文献>Materials >A Comparison of Simple Methods to Incorporate Material Temperature Dependency in the Green’s Function Method for Estimating Transient Thermal Stresses in Thick-Walled Power Plant Components
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A Comparison of Simple Methods to Incorporate Material Temperature Dependency in the Green’s Function Method for Estimating Transient Thermal Stresses in Thick-Walled Power Plant Components

机译：格林函数方法中估计材料温度依赖性的简单方法的比较该函数用于估算厚壁电厂部件的瞬态热应力

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摘要

The threat of thermal fatigue is an increasing concern for thermal power plant operators due to the increasing tendency to adopt “two-shifting” operating procedures. Thermal plants are likely to remain part of the energy portfolio for the foreseeable future and are under societal pressures to generate in a highly flexible and efficient manner. The Green’s function method offers a flexible approach to determine reference elastic solutions for transient thermal stress problems. In order to simplify integration, it is often assumed that Green’s functions (derived from finite element unit temperature step solutions) are temperature independent (this is not the case due to the temperature dependency of material parameters). The present work offers a simple method to approximate a material’s temperature dependency using multiple reference unit solutions and an interpolation procedure. Thermal stress histories are predicted and compared for realistic temperature cycles using distinct techniques. The proposed interpolation method generally performs as well as (if not better) than the optimum single Green’s function or the previously-suggested weighting function technique (particularly for large temperature increments). Coefficients of determination are typically above 0.96, and peak stress differences between true and predicted datasets are always less than 10 MPa.
机译：由于采用“两班制”运行程序的趋势日益增加，热电厂运营商日益关注热疲劳的威胁。在可预见的将来，热电厂可能仍将是能源组合的一部分，并且承受着社会压力，要求以高度灵活和高效的方式进行发电。格林函数法提供了一种灵活的方法来确定瞬态热应力问题的参考弹性解。为了简化集成，通常假定格林函数（源自有限元单位温度阶跃解决方案）与温度无关（由于材料参数的温度依赖性而并非如此）。本工作提供了一种简单的方法，可以使用多个参考单位解决方案和插值过程来近似估算材料的温度依赖性。使用不同的技术预测并比较实际温度循环中的热应力历史。拟议的插值方法通常比最佳的单个格林函数或先前建议的加权函数技术（尤其是对于较大的温度增量）要好（如果不是更好）。确定系数通常高于0.96，真实数据集和预测数据集之间的峰值应力差始终小于10 MPa。

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