一 引言 在这金属结构的年代里,人们似乎已经忘记了,从前,木材还是飞机上最主要的材料。木材有许多优异的性能,它具有金属的某些优点。材木除在切削加工时具有良好的成型性外,由于它的比重很小,故能选择任意的壁厚,尤其是当人们想到鋼的时候,就会设想到,木材的抗起泡性(Beulsteifigkeit)和稳定断裂的问题,必 I. INTRODUCTION In the age of metal structures, people seem to have forgotten that wood was once the main material on planes. Wood has many excellent properties, it has some of the advantages of metal. In addition to its good formability during machining, wood can be chosen for any wall thickness because of its low specific gravity, especially when it comes to steel, and the resistance of the wood to foaming (Beulsteifigkeit ) And the problem of stable fracture, must