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一、引言在航空和航天飞行器结构中,部分零、部件已经采用了复合材料,例如,飞行器体外悬伸杆,卫星壳体,火箭发动机部分外壳和本体,低温容器,导弹仪器舱,等等,其中有些部件要在低温(有时接近零下200℃)下承受动、静载荷,因此研究复合材料在低温下的破坏机理和力学性质是有实际意义的。迄今为止,这方面的研究甚少。本文研究玻璃钢在低温(-196℃)下的断裂韧度、断裂机理和强度极限,为了更清楚
I. INTRODUCTION In the aeronautical and astronautical spacecraft structure, some parts and components have been made of composite materials, for example, the overhung rod of the aircraft in the field, the satellite shell, a part of the shell and body of the rocket engine, a cryogenic vessel, a missile instrument cabin, Some of these components are subjected to dynamic and static loads at low temperatures (sometimes near minus 200 ° C). Therefore, it is of practical significance to study the failure mechanism and mechanical properties of composites at low temperatures. So far, there are few studies in this area. In this paper, the FRP fracture toughness, fracture mechanism and strength limit at low temperature (-196 ℃), in order to more clearly