Engineering Against Failure
Fastener failure can lead to catastrophic equipment damage and safety hazards. Understanding the metallurgical and mechanical reasons for failure is the first step in engineering a zero-failure assembly.
1. Hydrogen Embrittlement
Common in high-strength fasteners (10.9 and above), hydrogen embrittlement occurs when atomic hydrogen enters the steel during plating or acid cleaning. Under stress, this causes the bolt to snap without warning. Prevention includes proper baking cycles post-plating.
2. Stress corrosion Cracking (SCC)
SCC is a major concern for stainless steel in chloride-heavy environments. It occurs when a combination of tensile stress and a corrosive environment leads to sudden, brittle failure of otherwise ductile materials.
3. Thread Galling (Cold Welding)
Galling is common in stainless steel and titanium fasteners. During installation, the protective oxide layer is rubbed off, and the high spots on the threads weld together. This can be prevented through proper lubrication and controlled installation speeds.
4. Fatigue Failure
Fatigue occurs when a fastener is subjected to cyclic loading. Over time, micro-cracks form and propagate until the cross-section can no longer support the load. Ensuring proper pre-load is the best defense against fatigue.
PROJECT REQUIREMENTS?
Our engineering team provides custom manufacturing and material certification for all industrial projects.
REQUEST TECHNICAL QUOTE →