汽轮机转子半椭圆裂纹应力强度因子的改进权函数

Q4 Engineering Applied Engineering Letters Pub Date : 2019-01-01 DOI:10.18485/AELETTERS.2019.4.1.4
D. K. Prasad, K. Ramana, N. M. Rao
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引用次数: 0

摘要

本文提出了采用分段多项式插值函数的权函数法确定转子系统叶片安装位置引起的半椭圆裂纹的表面和最深点应力强度因子。首先对锥形转盘的数学模型进行了求解,得到了径向应力方程。利用相容条件,将这些方程应用于汽轮机转子系统叶片安装位置的应力分布。第二部分分别在半椭圆裂纹表面和最深点处导出五项和六项权函数,确定应力强度因子。这些函数的系数是假设沿裂纹的分段多项式应力分布来确定的。将该权函数方法应用于叶片安装位置的半椭圆裂纹,考虑了第一部分中裂纹离散点的应力,确定了应力强度因子。用影响系数法对所得结果进行了验证。收稿日期:26.03.2019。接受:29.03.2019。可用:31.03.2019。
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Improved Weight Functions for Stress Intensity Factors of Semi Elliptical Crack in Steam Turbine Rotor System
This paper presents weight function approach with piece wise polynomial interpolation function to determine the stress intensity factors at the surface and deepest points of a semi elliptical crack induced at the blade mounting locations of the rotor system. Initially, the mathematical model representing tapered rotating disc is solved and the equations for radial stress are obtained. Using the compatibility conditions, these equations are applied to plot the stress distribution at blade mounting locations in steam turbine rotor system. In the second part, weight functions with five and six terms are derived separately at the surface and the deepest points of semi elliptical crack to determine the stress intensity factors. The coefficients of these functions are determined assuming piece wise polynomial stress distribution along the crack. This weight function approach is applied to a semi elliptical crack at blade mounting locations by considering the stresses at discrete points of the crack obtained in first part and the stress intensity factors (SIFs) are determined. The results obtained are validated with the influence coefficient approach. ARTICLE HISTORY Received: 26.03.2019. Accepted: 29.03.2019. Available: 31.03.2019.
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来源期刊
Applied Engineering Letters
Applied Engineering Letters Energy-Energy (all)
CiteScore
1.60
自引率
0.00%
发文量
5
审稿时长
7 weeks
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