风电叶片复合材料层间剪切破坏声发射监测

采用声发射技术对含分层缺陷风电叶片多轴向复合材料的层间剪切破坏实验进行实时监测,研究分层缺陷对复合材料层间力学性能的影响规律及其损伤破坏过程的声发射响应特征.结果表明,具有不同分层面积的两类复合材料试样破坏载荷相近,当分层缺陷位于剪切面中间位置时,分层缺陷大小对界面承载能力影响不大,损伤演化主要集中在剪切面上偏离中心两...

Acoustic Emission Monitoring for Interlaminar Shear Failure of Wind Turbine Blade Composite

Acoustic emission(AE) testing technology was used to monitor the interlaminar shear failure of multi-axial wind turbine blade composites embedded with delamination defects in real time.The effect of delamination defects on interlaminar mechanical properties and corresponding AE response characteristics in the process of damage and failure were investigated.The results showed that the failure load of two composite specimens with various delaminated area was similar and it illustrated that the defect size had little effect on the interfacial loading ability when the delamination defects were located in the middle of shear plane.The damage evolutions were mainly occurred in an off center region which belonged to either side of the shear plane.As the area of delamination defects increased,the AE cumulative hits increased gradually.The AE relative energy,amplitude distribution and impinging source location signals were connected with the damage failure process in an off center high stress region which belonged to either side of the interlaminar shear plane.