复合材料飞轮破坏转速的算法和高速旋转破坏实验

分别基于平面应力型全弹性模型和三维数值模型建立了计算复合材料飞轮破坏转速的二维和三维算法。这两个算法均采用了正交各向异性材料的最大拉应力(材料主方向) 准则, 其中三维算法还采用了两种强度判据, 即基于轴向大部分区域每层应力的平均值判据和轴向边界区域每层应力的最大值判据。对张紧力缠绕的3个实验复合材料飞轮成功实施了高速旋转破坏实验, 破坏均发生在径向强度最弱的飞轮与金属芯轴的界面处。实验结果表明, 飞轮的实际破坏转速与理论破坏转速十分接近, 证实本文中建立的二维和三维算法是可靠的;二维算法得到的理论破坏转速偏高, 而飞轮的实际破坏转速落在三维算法分别按最大值判据和平均值判据得到的两个理论破坏转速之间, 说明三维算法的精度更高。

METHODS OF CALCULATING THE FAILURE ROTATING SPEEDAND FAILURE EXPERIMENT OF COMPOSITE FLYWHEEL

Based on the plane stress full-elastic model and 3D numerical model, 2D and 3D methods of calculating the failure rotating speed of the composite flywheel were established. In these methods, the maximal tension stress criterion of orthotropic material was adopted. Two strength criteria were adopted in the 3D method, namely average value criterion and maximal value criterion. High speed rotating and failure experiment was developed on three flywheels and the failure occurred at the interface between mandrel and flywheel. The test results show that the actual failure speed is very close to the theoretical failure speed and the 2D and 3D methods are reliable. The theoretical failure speed calculated by the 2D method is comparatively higher. And the actual failure speed is in between of the theoretical failure speed calculated by the 3D method. It shows that the 3D method is more accurate.