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Fasteners

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

A 500 KV line lattice angle exhibits cracked during repair. The investigation revealed the selected steel did not have adequate toughness for this application and the angle should have been drilled instead of punched

Matergenics – Materials Testing Brochure

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
Microscopic examination
Physical measurements
Corrosion examination
Chemical analysis
Metallurgical testing / metallography
Fractography examination
Mechanical testing
Scanning electron microscopy (SEM)
Elemental dispersive X-ray analysis (EDS)
Fourier transformer infrared analysis (FTIR)
X-ray diffraction
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 info@matergenics.com.

Looking forward to hearing from you!

 

 

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