Method on rupture life evaluation for composite cylinder based on data fusion of carbon fiber

A composite cylinder structure consists of aluminum alloy cylinder structure wall winded by T700 carbon fiber composite. The failure data still cannot be obtained sufficiently by the accelerated life test due to the time limitation in engineering, and the most of the data is a mixture of high censored ratio data in high stress level and zero-failure data in low stress level. To the problem of low confidence level for rupture life evaluation by the current method, the equivalency of acceleration and consistency of failure mechanism for carbon fiber and cylinder were analyzed firstly, and then the statistical test was made and the information was fused for the part covariance matrix of accelerated model parameters. At last, a rupture life evaluation method was established for the cylinder with fusion the carbon fiber data. It can improve the evaluation accuracy of the cylinder by using the similar information. The proposed method is proved effectively by the test data, and it makes the evaluation accuracy of the cylinder increase 35%.