某重型卡车的发动机进气软管在使用6个月后就出现了多处开裂破损。通过宏观观察、钢丝理化检验、钢丝断口分析、进气管壁厚测量及耐压测试等方法，对进气软管的开裂原因进行了分析。结果表明：进气软管包裹层表面脱胶使软管钢丝发生应力腐蚀断裂，断裂钢丝使软管管壁形成鼓包，其部分尖锐的断口刺穿软管形成开放破损，并进一步撕裂扩展最终导致软管开裂失效。

The engine intake hose of a heavy truck was cracked in many places after 6 months of use. The cracking causes of intake hose were analyzed by means of macro observation, steel wire physical and chemical test, steel wire fracture analysis, wall thickness measurement of intake hose and withstand voltage test. The results show that the degumming on the surface of the wrapping layer of the intake hose caused the stress corrosion fracture of the hose steel wire, and the fractured steel wire caused the bulge on the hose wall. Some sharp fractures pierced the hose to form the open breakage, and further tore and expanded, which eventually led to the cracking failure of the hose.