大约两年前,在美国佛罗里达州的国家航空航天局肯尼迪空间中心里,技术人员正在对一架航天飞机进行检查.他们在主引擎燃料管道的避震器上发现了一个小小的毛病.这个避震器是一根“L”形的波纹管,由2.3毫米厚的不锈钢制成,长约6英尺,重约2000磅.但是就在它的肘节处,出现了约一枚硬币的凹痕.凹痕虽不太深,但凹陷处损伤程度影响航天飞机下次升空的安全.在1986年初,挑战者号因密封圈受冷变形而发生爆炸,使美国的航天计划严重受挫之后,美国人再也不会小看任何不起眼的质量问题的了.但是,对这一凹痕的检查不是轻而易举的事情,如将这根波纹管拆开检查,就意味着这根价值10万美元的 About two years ago, technicians were inspecting a space shuttle at the NASA Kennedy Space Center in Florida, United States, where they found a minor problem with the shock absorbers on the main engine fuel pipe. The shock absorber is an “L” bellows made of 2.3 mm thick stainless steel measuring about 6 feet and weighing about 2,000 lb. But at its toggle, a concave about one coin appeared However, the indentation is not too deep, but the degree of damage in the depression affects the safety of the space shuttle’s next launch. In early 1986, after the Challenger was exploded due to cold deformation of the seal ring and the U.S. space program was severely frustrated, Americans will no longer underestimate any humble quality problems.However, the inspection of the dent is not an easy task, such as the bellows open inspection, it means that the root value of $ 100,000 of