飞艇蒙皮缝线光老化试验研究

Research on Airship Envelope Suture by Light Aging Test

目的研究飞艇蒙皮缝线的光老化规律并确定其有效期。方法在辐照强度为0.35 W/m2@340nm,温度为77℃,相对湿度为70%,2 h内照射1.5 h、喷淋0.5 h的条件下,采用氙灯光照进行30天的加速老化试验。通过测量飞艇蒙皮缝线试验后的断裂强力,计算得到飞艇蒙皮缝线的断裂强力下降率,评定蒙皮缝线的抗老化性能。结果经过16天的光老化试验,飞艇蒙皮缝线的断裂强力下降率达20%;试验30天后,缝线出现明显裂纹,断裂强力下降率达80%。结论随试验时间的增加,飞艇蒙皮缝线的力学性能下降的速率逐渐增大,飞艇蒙皮缝线在试验条件下的有效期为16天。

Objective To study the light aging law and to determine the validity period of the airship envelop suture. Methods Under conditions of radiation intensity 0.35 W/m~@340nm, temperature 77℃, relative humidity 70%, irradiation 1.5h and spray 0.5h in 2h, the xenon lamp light accelerated aging test was conducted for 30 days. The breaking strength of envelope suture was measured to calculate the breaking strength decline rate after light aging test. The aging resistant properties were evaluated by the breaking strength decline rate. Results The breaking strength of airship envelop suture decline rate was 20% after 16 days of light aging test, and the breaking strength decrease rate was 80%, and further more crack appeared on the suture after 30 days of test. Conclusion The decline rate of envelope suture mechanics performance increased with the test time, and the airship envelop suture was valid for 16 days under the test conditions.