Stainless Steel Weld Fittings is the main large-load main bearing member on the bracket. The structural design and optimization of stainless steel pipe fittings, the theoretical design and experimental analysis of the compression resistance, yield strength, preparation technology, and axial compression performance of stainless steel pipe fittings were studied. Strength design has always been a difficult and hot point in the structural design of stainless steel pipe fittings, and it is an important link. Whether it is an angularly laminated stainless steel pipe fitting or an axial/circular orthogonal laminated pipe fitting, an appropriate amount of circumferential layer can significantly improve the axial compressive strength of the pipe fitting. After changing the 20% angle layup (axial layup) to the circumferential layup, the axial compressive strength of the stainless steel pipe fittings with a winding angle of 20° is approximately doubled, and the axial compressive strength of the orthogonally laid stainless steel pipe fittings is also increased by more than 10%.

The finite element model was used to analyze the load-bearing performance of the composite thrust bracket used on the reusable launch vehicle demonstrator X-33 and Atlas V launch vehicle. It was pointed out that the structural form of the X-33 thrust bracket has a relatively high comprehensive load-bearing capacity. It is good and suitable for more complex load conditions, while the Atlas V-type thrust bracket structure has better compression load-bearing capacity and is suitable for load conditions dominated by large thrust.