Ductility is Safety - ONTON Technology Co.,Ltd

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Ductility is Safety

Every reinforced grouting hollow bar item, whether CTS, MAI or DYWIDAG systems, is composed of two materials: concrete and hollow steel bar.

The concrete is a kind of brittle material, which has a very low ductility. It means that the concrete structure without high ductile material would collapse suddenly when overloading.

And the high ductility hollow bar acts as the role that supplies ductility. It can last much longer time under the stresses higher than yield strength with plastic deformation.

The stress-strain curve of a hollow bar can represent its ductility clearly. In the case of low ductility (brittle) bar, once the yield stress is reached, the plastic deformation (non-linear) curve is short with the strain (NOT Time!) increase. The yield point is close to the fracture point.

For high ductility hollow bar, it supplies ductility to concrete structure to achieve good ductility performance. If the structure is near break, it could warn through deflections or cracking, rather than sudden collapse.

Stress strain curve of a threaded hollow bar

SGS test stress strain curve report of ONTON self-drilling anchor bolts (hollow bar) - Higher ductility than other brands - safety based on technical theory and data

There are also easy ways to measure ductility of hollow bars, please see it at Bend / Rebend Test Result of Hollow Threaded Bar (SDA, IBO), Agt and A of hollow bars and Why do we emphasize Ductility?

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