美空军大力神火箭计划官员正在研究固体助推器分段推进剂中的裂纹,它可能是引起上月大力神-4爆炸的原因.推进剂中的裂纹可形成燃烧通道。而使钢壳体烧穿.穿孔可能发生在1号发动机的第三段(从下往上数)上,在发动机段接头下面508mm 处.该区域推进剂与壳体之间的绝热层较薄.穿孔沿芯级方 Hercules program officials at the U.S. Air Force are studying cracks in solid propellant segmented propellants, which could be the cause of the explosion last month at Hercules 4. Cracks in the propellant form combustion passages. And the steel shell burned through. Perforation may occur in the third segment (number from bottom to top) of engine No. 1 at 508 mm below the segment of the engine segment. The insulation between the propellant and the shell in this region is thin Pierce along the core level