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给定形状裂纹的SIF(应力强度因子)可以通过各种数值方法确定,但裂纹扩展过程中裂纹形状不断发生变化,对任意时刻所对应的裂纹进行全三维分析确定裂纹前缘应力强度因子不现实且难以实现。通过采用有限元法事先计算各种不同形状、尺寸的桅杆结构纤绳连接拉耳孔边裂纹前缘表面点及最深点处的应力强度因子及无因次形状因子,然后对基本数据进行多参数拉格朗日插值的方法来求解拉耳任意形状孔边裂纹的应力强度因子。并对某一形状裂纹的应力强度因子插值计算结果与有限元直接分析结果进行了对比,结果表明插值法具有较高的可靠性,可用于应力强度因子的近似计算。
The SIF (Stress Intensity Factor) for a given shape crack can be determined by various numerical methods, but the shape of the crack changes continuously during the crack propagation. The full three-dimensional analysis of the crack at any moment confirms that the crack front stress intensity factor is impractical And difficult to achieve. The finite element method is used to calculate the stress intensity factor and the dimensionless form factor at the surface point and the deepest point of the crack leading edge of the mast structure in various shapes and sizes beforehand, Longri interpolation method to solve the stress of Lore crack edge any shape strength factor. The stress intensity factor interpolation of a shape crack is compared with the results of direct finite element analysis. The results show that the interpolation method has high reliability and can be used in approximate calculation of stress intensity factor.