There was a time when the periodic repair of mechanical and electrical components was taken for granted. Today, with labor costs at record levels and going up, greater consideration at the design level is being given to the reduction—or even elimination—of maintenance.
In cases where a joint must be taken apart and reassembled, the corrosion resistance of the fastener is particularly important so that corrosion will in no way hamper or prevent its removal. The cost of removing rusty bolts, and replacing them with new ones, is more expensive than using corrosion resistant fasteners to begin with.
Other costs resulting from fastener failure, such as downtime and lost pro- duction, make an even stronger case for consideration of high integrity fastener systems.
Consequently, the designer needs to consider a fastener as a system, and regard the assembled joint as a critical and integral portion of the design, since the joint is normally an area under the highest stress and often the place where failure is most likely to occur. A designer should start with the optimum fastener and design the joint around that, rather than starting with the joint and then looking for the fastener that seems most adequate.
Failure Analysis: Cracking, Corrosion and Wear:
Failed Surface Treated Fasteners
Ductile and Brittle cracking and Fracture
Decisions must be made during any failure analysis, and the results of each step dictate the next procedure. At Matergenics, our material, corrosion and mechanical engineers systematically perform required tests as deemed necessary based on the project at hand. Typical steps we often use in our root cause failure analysis investigations:
Review of background information
Visual and non-destructive examination
Metallurgical testing / metallography
Scanning electron microscopy (SEM)
Elemental dispersive X-ray analysis (EDS)
Fourier transformer infrared analysis (FTIR)
Mechanical testing Surface analysis
Finite elemental analysis (FEA), computational fluid dynamics (CFD) or other engineering calculations
Determination of mode of failure and primary cause
FEA, CFD and other detailed engineering calculations
Materials Selection for fasteners in corrosive environments and corrosion mitigation for galvanic corrosion
We are here to help
We respond to all customers promptly by sending a technical proposal to address testing, investigation and the proposal costs. If we need more information, our engineers will contact you.We respond to all customers promptly by sending a technical proposal to address testing, investigation and the proposal costs. If we need more information, our engineers will contact you. Whether you are a large corporation or a small enterprise, we will provide you with the attention you need and deserve. In so doing, we hope to work with you for many years to come.
Please call Dr. Z ee at 412-952-9441 and let us know how we can assist you in your investigation. Alternatively, you can send your request to firstname.lastname@example.org.
Looking forward to hearing from you!