GrabCAD 模型信息
Bracket (0.04773 lb) · 模型 257887
Bracket Details… 1. Mass = 0.04773 (lb) 2. Volume = 0.98602 (cubic in) 3. Max. von Mises Stress = 4,116 (psi) 4. Contact patch with minimum edge distance meet/exceed requirements for Datum A and B surface areas. 5. Bracket design employs custom, ultra-low profile shoulder screw (similar to McMaster-Carr P/N 90318A403) and attachment method to enable fixed hinge constraints at mounting holes without requiring torque or tension preload to screws. 6. Bracket and all mounting bolts/screws are inside the design envelope provided and easily accessible. FEA Constraints… 1. Fixed Hinge at the cylinder IDs of bracket mounting holes for attachment to the Centaur Interstage Adapter 2. Displacement = 0 in the radial direction On Cylindrical Faces of bracket in contact with Datum A 3. Displacement = 0 On Flat Faces, in the direction normal to the face of hole boss (split surface area under screw head; diameter = 0.375 in.) External Load… 1. 600 lbf applied uniformly on surface area of bracket at Datum B Result Comments… 1. It appears the two lower mounting boss are able to carry the full load (very low stress to bracket’s upper mounting boss). As such, a modified bracket design with the upper mounting holes eliminated would reduce the weight of the bracket. More importantly, the weight of the upper mounting screws and corresponding support structure for said screws are also eliminated. Needless to say, these weight reductions can be significant relative to the subject bracket’s weight. Modified Bracket Details… Mass = 0.04428 (lb) Volume = 0.91461 (cubic in) Max. von Mises Stress = 4,151 (psi) 2. It is interesting that mounting holes for the platform have a larger size (0.27 in. dia.) vs. the bracket mounting holes (0.22 in. dia.) and without external loading on the larger screws/bolts to fit therein. Perhaps Ultem 9085 screws with ACME thread can be employed (weight = .00202 lb/each).
- 格式
- Rendering、Other、STEP / IGES
- 分类
- 3D printing、Aerospace、Machine design
- 标签
- rockethardware
- 数据更新
- 2026-10-30T00:21:10Z