29
Jun
Root Cause Analysis of Core Rod Fracture During Crimping or Tensile Testing
I. Failure Characteristics
The fracture typically occurs inside the ball-end or socket-end metal fitting. The primary symptom is a tensile failure load that is significantly lower than the rated design value.
II. Root Cause Analysis
Excessive Crimping Force: The pressure applied during the crimping process exceeds the radial compressive strength of the core rod, leading to internal structural damage.
Improper Crimping Position: The crimping dies are not centered; the compression zone should ideally be located in the middle of the fitting's connection area.
Poor Machining Precision of Fittings: Issues such as eccentricity of the inner hole, insufficient cylindricity, or internal tapers can...