Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Engineering

Failure Modes of Bolted Joints Under Cyclic Loading

Quick fact

Under cyclic loading, a bolted joint can fail at stress levels as low as 30-50% of its static yield strength, often without any visible deformation or warning.

Why this is interesting

A bridge bolt that looks perfectly fine today can snap without warning tomorrow. Why would a bolted joint fail even when the load it carries is far below its rated strength?