Fastener fracture failure, these 4 reasons you need to know!

Release time:

2021-10-30

The bolts we usually use may be at risk of fracture, so do you have to analyze the specific causes of fracture? As a screwdriver, the editor lists four common possibilities-stress factor, corrosion, fatigue, and hydrogen embrittlement.

The bolts we usually use may be at risk of fracture, so have you analyzed the specific causes of fracture? As a screwdriver, the editor lists four common possibilities--Stress factor, corrosion, fatigue, hydrogen embrittlement.

01stress factor

Stress Factor-Exceeding conventional stress (overstress) results from any one or a combination of shear, tension, bending, and compression.

02Corrosion

Another cause of bolt fracture is corrosion. Corrosion takes many forms, including ordinary corrosion, chemical corrosion, electrolytic corrosion, and stress corrosion.

03Fatigue

Fatigue in a bolt is the constant action of a cyclic tensile load, so that the bolt is subjected to a relatively small preload and an alternating working load. Under long-term exposure to such double loads, bolts will fail at less than their rated tensile strength.

04hydrogen embrittlement

Like high-strength steel fasteners (generally Rockwell hardness of C36 to_), hydrogen embrittlement is more likely to occur. Hydrogen embrittlement is the main cause of fastener fracture. Hydrogen embrittlement is the phenomenon when hydrogen atoms enter and diffuse throughout the material matrix. When an external load is applied to the screw, the hydrogen atoms migrate to a highly concentrated area of stress, causing an extremely large stress between the edges of the crystal boundaries, which can cause cracks between the crystal particles of the fastener.

Once the fastening failure will cause machine failure, serious or even casualties. So choose a quality can stand the test, the strength of the finished fastener manufacturers are more important.

Source: Fastener Industry Network

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