Tensile Strength Prediction of High-voltage Bushing Polyetherimide Composites Under Accelerated Thermal Aging
Thermal aging can easily lead to the failure of glass fiber/polyetherimide(GF/PEI)cable sleeves.Therefore,it is very important to study the change law of mechanical properties of GF/PEI composites under the effect of thermal aging to improve the reliability of cable sleeves.Firstly,the GF/PEI composite board was subjected to thermal aging treatment at different temperatures in the range of 85～145 ℃,and then tensile experiments were carried out on the samples at different thermal aging temperatures to test the tensile strength.At the same time,the law of color difference of the materials under different thermal aging effects was investigated.Finally,a support vector regression model was used to establish the relationship between color difference and tensile strength to predict the tensile strength.The test results show that the tensile strength of GF/PEI composites decreases gradually with the increase of the thermal aging temperature,while the color difference generally maintains an increasing trend,and the both show significant correlation.The modeling results show that compared with traditional linear regression model and BP neural network,1 the proposed support vector regression model can effectively characterize the nonlinear mapping relationship between color difference and tensile strength,and can successfully predict the tensile strength of materials based on color difference with smaller errors.
万方数据
维普
