No abstract

With the popularity of electric vehicles, the ever-increasing demand for high-capacity batteries highlights the need for monitoring the health status of batteries. In this article, we proposed a magnetic imaging technique (MIT) to investigate the health status of power batteries nondestructively. This technique is based on a magnetic sensor array, which consists of a 16-channel high-performance magnetoelectric sensor, and the noise equivalent magnetic induction (NEB) of each channel reaches 3–5 pT/Hz1/2@10 Hz. The distribution of the magnetic field is imaged by scanning the magnetic field variation of different positions on the surface. Therefore, the areas of magnetic anomalies are identified by distinguishing different magnetic field abnormal results. and it may be possible to classify the battery failure, so as to put forward suggestions on the use of the battery. This magnetic imaging method expands the application field of this high-performance magnetoelectric sensor and contributes to the battery’s safety monitoring. Meanwhile, it may also act as an important role in other nondestructive testing fields.

No abstract

The determination of the load distribution between bolts is a crucial step in predicting the failure of bolted joints. In this paper, the purpose is to investigate the effects of stacking sequence on the load distribution and the stress distribution around hole of a double lapped and three bolted joint composite plate with shearing force. The accuracy and reliability of the finite elements model was verified by the spring method results and test results at first. Subsequently, the load distribution among bolts and the stress distribution around hole of six structural combinations of two stacking sequence composites were studied. Results indicate that the load distribution ratio of the sequential structure is more even than that of the symmetrical structure. And the symmetrical stacking structure can bear greater stress than that of the sequential stacking structure, which is about three times that of sequential stacking structure. As the external loading increases, the hole-edge stress is relatively stable at ±45° layer, while the hole-edge stress of the orthogonal layer is varied and occurs damage failure at 90° around the hole.

No abstract