一、引言 目前,国内外航空设计者都认为,在飞机设计中主要结构材料选择适当与否,将直接影响飞机的战术性能、设计定型进度、生产可能性、寿命和可靠性等。如果选择了合理而可靠的材料,就可以提高飞机的结构效率,使之减轻重量,增加推重比,改善机动性,提高载重 I. INTRODUCTION At present, both domestic and foreign aviation designers think that the proper selection of the main structural materials in the aircraft design will directly affect the aircraft’s tactical performance, design shape progress, production possibilities, life expectancy and reliability. If you choose a reasonable and reliable material, you can improve the structural efficiency of the aircraft, so that it can reduce weight, increase the thrust-weight ratio, improve maneuverability and increase load