基于最小二乘支持向量机的应力强度因子预测模型

发布时间：2018-01-15 17:19

本文关键词：基于最小二乘支持向量机的应力强度因子预测模型　出处：《机械设计与研究》2016年04期 　论文类型：期刊论文

【摘要】：应力强度因子是表征材料断裂的重要参量,与应力大小,裂纹的形状和裂纹长度有关。对应力强度因子进行分析,基于最小二乘支持向量机原理,结合粒子群优化,建立以应力大小和裂纹长度作为输入值,应力强度因子为输出值的模型,从而对应力强度因子进行分析和预测。模型预测值与理论值进行分析比较,结果显示,基于最小二乘支持向量机结合粒子群优化算法建立的数学模型,模型拟合优度为0.994 9,可通过应力大小和裂纹长度预测应力强度因子,预测值与精确值的相对最大误差为0.186 4,可证明该模型的适用性与精确性。
[Abstract]:Stress intensity factor (SIF) is an important parameter to characterize the fracture of materials, which is related to the size of stress, the shape of crack and the length of crack. The stress intensity factor is analyzed based on the principle of least squares support vector machine (LS-SVM). Combined with particle swarm optimization, a model with stress size and crack length as input value and stress intensity factor as output value is established. The results show that the mathematical model based on least squares support vector machine combined with particle swarm optimization algorithm is established. The goodness of fit of the model is 0.994 9. The stress intensity factor can be predicted by the stress size and crack length, and the relative maximum error between the predicted value and the accurate value is 0.186 4. The applicability and accuracy of the model can be proved.
【作者单位】：中北大学机械与动力工程学院;中北大学机电工程学院;
【基金】：部级预研项目
【分类号】：TP18;O346.1
【正文快照】： 当构件中存在裂纹时,在裂纹附近部位,会出现应力集中现象,甚至可引起裂纹进一步扩展,最终导致零件断裂失效。弹性物体在外力作用下,应力强度因子可用于表征裂纹尖端附近的应力场强度,是衡量材料断裂的重要表征参量之一。它和裂纹的形状、应力大小和裂纹长度有关。支持向量机[1

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