Fatigue Type DYN

Fatigue Type DYN

—— Couplers

Fatigue Type DYN

Optimized for fatigue strength

  • The DYN mechanical connection is predestined for parts of structures subject to dynamic loads, such as railroad engineering structures. Tested by national and international institutes for up to 20 million cycles, these connections guarantee long-lasting, fatigue-resistant connections.
  • Meeting CCF (Swiss railway) requirements
  • Range certified to AFCAB fatigue option, and UK CARES TA1-B requirements
  • Sized for reinforcing bars with a maximum breaking value of 740 Mpa.
  • For this range of connections, it is necessary to roll (or deform) the thread to avoid any breakage in the thread.

Technical aspects of fatigue

This range has been designed for structures subject to heavy cyclic and dynamic stresses, and in which the reinforcement must demonstrate fatigue behavior under stress ranges greater than 60 80N/mm², as specified in the Euro-codes.

The fatigue response of mechanical splices cannot be satisfied by a binary response; it will depend on the requirements of the stress range and the number of cycles obtained before failure. The representation of the fatigue performance of a connection is called a Wöhler curve, and enables a statistical approach to the fatigue performance of connections.
Some countries, such as Switzerland, which pioneered this requirement for the construction of engineering structures, require tests of over 20 million cycles to determine the curve’s inflection points.

A coupler with a chamfer, but whose raw material requirements are calibrated for fatigue resistance. A high-performance, cost-effective manufacturing process for rapid threading of bar ends. Reliable industrial production tools for calibrating the bar before thread rolling, with flexible diameter changes to enable you to supply your customers quickly.

Production equipment, threading tools and couplings are available from stock for diameters from 16 to 40 mm.

Other diameters are available on request.

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Quality and certification

A guarantee of quality

Our top priority is your satisfaction.
We guarantee you a top-quality product that meets the most stringent constraints and control requirements of all international standards.

Standard – type C FR

Complies with NFA 35020 and Eurocode 2 fatigue requirements.

Withstands steels with an RM of 700Mpa.

Available and in stock for diameters from 12 to 43 mm.