国产T700炭纤维复合材料发动机壳体强度设计及成型工艺

Strength design and fabricated technology of domestic carbon fiber T700 composite motor case

为推进国产T700炭纤维在发动机壳体上的应用,针对其进行复合材料缠绕成型的带距与张力等关键工艺参数设计,并进行复合材料试验及工艺优化,得到发动机壳体缠绕成型的工艺及关键设计参数。基于以上参数采用网格理论进行发动机壳体的强度设计,缠绕成型ф150 mm发动机壳体,并进行水压爆破试验验证。结果表明,国产T700炭纤维的缠绕张力与带距等对复合材料力学性能影响较大,起始缠绕张力30 N每层递减0.5 N以及缠绕设计带距为2.5 mm为最佳缠绕工艺参数,经工艺优化的国产T700炭纤维的强度发挥率高达83.2%,采用优化后的工艺参数制备的发动机壳体的爆破压强达到36.5 MPa,容积特征系数(pV/W)高达43.6 km,具有较高的结构效率。所得工艺及关键设计参数可为国产T700炭纤维在发动机壳体等高压容器上的应用提供借鉴。

The purpose of this paper is to promote the application of T700 carbon fiber in motor case. Composite winding band- width and tension in the process of filament winding have been studied by using the carbon fiber T700. Furthermore, the composite mechanical performance tests and process optimization have been carried out. On this basis, the key process and design parameters of motor cases were gained. Besides,those were used to design the motor case with 150 mm in diameter by means of grid theory.E-ventually, the motor cases were fabricated by filament winding technique and its performance has been studied through hydraulic bursting test.The results show that the coil tension and bandwidth of domestic T700 carbon fiber has positive effects on the mechani- cal properties of composites.The initial winding tension （30 N per layer） was decreased by 0.5 N, where the winding design band distance of 2.5 mm is the best winding processing parameter.Through process optimization, the strength of domestic T700 carbon fi- ber was increased up to 78%. The blasting pressure of the motor cases, which have been used as the optimum processing parameters and designed by using the experimental data, is up to 36.5 MPa.The pV/W value of the prepared motor cases is up to 43.6 km, and it presents high structure efficiency.These results could be used to promote the application of T700 carbon fiber on high pressure vessel, such as motor case.