Fatigue strength improvement of steel structures by high-frequency mechanical impact: proposed fatigue assessment guidelines

Numerical fatigue life analysis of a high frequency mechanical impact treated industrial component based on damage mechanics models

“…Figure 4. A significant increase in fatigue life could be determined [2][3][4][5][6][7][8][9][10][11][12][13][14]. For a better comparison the inverse slope m and the FAT value at 2Á10 6 cycles for a failure probability of 50 % according to the equation…”

“…The advantages of removing the potential threats of unwanted (tensile) residual stresses and exploiting the beneficial (compressive) residual stresses by mechanical treatments are already known in welding communities. In this context, high frequency hammer peening as post weld treatment is a statistically proven method to increase the fatigue life of welded joints [2][3][4][5][6][7][8][9][10][11][12][13]. During this process, a hardened cylindrical metal pin with a spherical tip impacts the weld toe surface with high frequency and induces local plastic deformation.…”

Research of wear resistance of bronze bushings during plastic vibration deformation

“…This is due to the harmonic vibrations of a workpiece or tool [3]. In [4], the authors note an increase in the metal fatigue resistance under vibro-impact loading.…”

“…Damping, along with other properties, is an independent physico-mechanical property of metals and alloys [1,2]. The damping capacity of structural materials can be increased by applying an appropriate functional metal coating [3,4], in particular, by plasma sputtering [5,6]. Coating materials include powders of different compositions -metallic [4,7], ceramic [8], nanostructured [9,10], and plated [11].…”

Life Extension Technique for Welded Structure Using Hfmi/Pit: A Review on Past and Current Researches With Applications

“…Because the S-N lines in the as-welded state follows a slope m = 3 and, after HFMI treatment, the slope is changed to m = 5, the computed improvement in fatigue strength changes as a function of N. The FAT value after HFMI treatment for the cruciform joint shows an increment factor of 1.91 for a survival probability of 95% and an increment factor of 2.38 for a survival probability of 50%. [21][22][23][24]. Haagensen [3], Yildirim and Marquis [25] and Maddox [26], had observed that the degree of improvement for HFMI treated and hammer peened welded components increases with material strength.…”