Ductile dimple rupture (microvoid coalescence) caused by severe over load condition
Fastener Consulting
We consult on variety of issues related to fasteners and cold formed or cold headed components. We help our clients with selection of the right grade of fastener and how to prevent failure from reoccurring. Our metallurgical and engineering expertise in this field comes from a combined 50+ years of experience. Call us with your questions about:
What grade fastener to use in your design or to specify on your print
- Why is it failing
- What clamp load to use
- What should you spec for coatings
- What should you spec for materials and heat treat
- How can you prevent hydrogen embrittlement
- How to sort for a quality issue
- Drawing and Cold Heading issues
- Other issues
Failure Modes of Threaded Fasteners
The differences between a manufacturing and design quality defect.
Identify whether a failure is due to a fault in the design or is manufacturing related.
Main design related failure modes of threaded fasteners and bolted joints.
The critical importance of a fastener's clamp force in ensuring a joint's structural integrity.
Why the joint design normally prevents bolt overloading.
Fatigue and where failures normally occur on a threaded fastener.
Why bearing stress can be crucial in ensuring a reliable joint.
The nature of internal and external thread stripping failures.
