will123123
Materials
- Nov 26, 2009
- 46
My company has experienced some unexpected in service failures of hydraulic parts that previously worked fine; the failures involved cracking adjacent to core plugs. The cracks were in the short transverse plane and had the appearance of over load - ie signs of local yielding at the initiation site and no evidence of beach marks/striations. At the moment we do not believe the service conditions have changed and we are confident that the size of the core plugs and the bores are to spec.
These parts are approximately 100mm*120mm*120mm in size and machined from aluminium 7075 T651. The batch of parts that are failing were made from plate material of size 100mmx1520mmx3030mm; previously I believe parts were made from extruded bar (unfortunately poor record keeping has meant this cannot be confirmed) Is anyone able to tell me whether the short transverse properties of smaller extruded bar are better than that of plate?
These parts are approximately 100mm*120mm*120mm in size and machined from aluminium 7075 T651. The batch of parts that are failing were made from plate material of size 100mmx1520mmx3030mm; previously I believe parts were made from extruded bar (unfortunately poor record keeping has meant this cannot be confirmed) Is anyone able to tell me whether the short transverse properties of smaller extruded bar are better than that of plate?
