Fatigue improvement of welded steel joints by high frequency mechanical impact treatment

2015 ◽  
Vol 46 (2) ◽  
pp. 136-144 ◽  
Author(s):  
G. B. Marquis ◽  
H. C. Yıldırım
Keyword(s):  
High Frequency ◽  
Fatigue Improvement ◽  
Welded Steel ◽  
Mechanical Impact ◽  
Steel Joints

scholarly journals New And Existing Bridge Constructions - Increase of Fatigue Strength of Welded Joints by High Frequency Mechanical Impact Treatment

2013 ◽  
Vol 2 (1) ◽  
pp. 88-101
Author(s):  
Thomas Ummenhofer ◽  
Philipp Weidner ◽  
Tim Zinke
Keyword(s):  
Fatigue Strength ◽  
Welded Joints ◽  
High Frequency ◽  
Research Work ◽  
Steel Structures ◽  
Current Status ◽  
Small Scale ◽  
Welded Steel ◽  
Mechanical Impact ◽  
Existing Structures

Abstract Numerous studies at KIT prove that high frequency mechanical impact (HFMI) treatment is an efficient method for increasing the fatigue strength of welded steel structures. Within different research projects it was found that HFMI-methods can be used successfully for new and existing structures in order to extend the fatigue life. This paper gives an overview of the current status of existing steel bridges in Germany regarding aspects like bridge age distributions and traffic loads. Based on that overview welded joints susceptible to fatigue failure are identified. Using component-like small scale specimens, HFMI-methods were investigated within the objective of implementing an effective application for new and existing structures. Applying the fatigue test data observed, existing design proposals are evaluated and design recommendations for HFMI-treated joints are given. As a result of the research work, a transfer into practice has been realized and different applications are illustrated using the example of bridge constructions made of steel.

scholarly journals Two-Stage Model for Fatigue Life Assessment of High Frequency Mechanical Impact (HFMI) Treated Welded Steel Details

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1318
Author(s):  
Boris Fuštar ◽  
Ivan Lukačević ◽  
Davor Skejić ◽  
Mladen Lukić
Keyword(s):  
Fatigue Life ◽  
Crack Initiation ◽  
High Frequency ◽  
Life Assessment ◽  
Stage Model ◽  
Two Stage ◽  
Welded Steel ◽  
Mechanical Impact ◽  
Steel Grades ◽  
Critical Components

Welded steel details are critical components from the aspect of fatigue. Additional fatigue resistance can be achieved by the High-Frequency Mechanical Impact (HFMI) treatment. This treatment increases the crack initiation period by improving the weld geometry, introducing compressive residual stresses, and increasing the weld toe’s hardness. The study presented in this paper is based on the development and calibration of an Initiation–Propagation-based Two-Stage Model (TSM), which is, by the combination of different methods, suitable to separately consider crack initiation and crack propagation. It is shown that a TSM is able to predict the fatigue life of as-welded and HFMI-treated welded steel details, which is proven by comparing the calculated results with the results of tests on similar details given in the literature. A parametric study of the TSM is conducted for different steel grades in order to investigate the influence of steel strength and HFMI parameters on fatigue lives of a welded steel detail with longitudinal attachment.

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