Carbon Steel Bold fracture
Carbon Steel Bold fracture
(OP)
Dear all,
I got this bolt that fractured during service. The screw does see some low cyclic tensile loads in the orders of ~10- 100 /day. Environment unknown. From the degradation of the zinc coating I would think some moisture but nothing severe.
It is Carbon steel 1025 Galvanized.
Take a look at the attached pics and let me know what you think.
I got this bolt that fractured during service. The screw does see some low cyclic tensile loads in the orders of ~10- 100 /day. Environment unknown. From the degradation of the zinc coating I would think some moisture but nothing severe.
It is Carbon steel 1025 Galvanized.
Take a look at the attached pics and let me know what you think.





RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
RE: Carbon Steel Bold fracture
Regarding material: you should look at the bolt head markings, which will tell you what material and associated properties you should expect.
Aaron Tanzer
www.lehightesting.com
RE: Carbon Steel Bold fracture
PS; striations caused by fatigue crack propagation require much higher magnification to view. Crack arrest lines could be visible at this magnification.