Comparison and Tensile Strength Analysis of Connection Modes of Aerostat Pipe Structure
The structural components of aerostat,such as pods,transition,propulsion support,etc,are mostly connected by metal pipes.The connection of aerostat pipe structure lacks actual measured data of limit values under operating condi-tions,and there is not enough theoretical support in the selection of materials and connection modes at present.Different connection modes of common pipes should be compared and analyzed for fracture.The aluminum alloy and titanium al-loy pipes are connected by screw and welding modes,respectively.Their physical properties are tested and simulated anal-ysis is performed to verify the reason of fracture.The results show that compared with the screw connection,the welding mode improves the connection strength by 87.9％for TA1 titanium pipes.Compared with the welding mode,the screw connection improves the connection strength by 39.3％for 6061 aluminum alloy pipes.The welding connection strength of 2A12 aluminum alloy pipes is better than their screw connection strength.Meanwhile,it is found that the pipe deforma-tion is a critical factor affecting the connection strength of welding pipe.Stress concentration is easy to occur at the joint of pipe ends,leading to cracks in the welding line of the ends.The pipe deformation results in tearing phenomenon when the base material is fractured,and further lowers the maximum connection strength of pipes.
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