Theoretical and Experimental Study of Strain Localization and Energy Dissipation at Fatigue Crack Tip

Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack

“…7a, where the thermoelastic effect superimposed to the mean temperature evolution T* m can be appreciated. Considering the radial temperature profiles that have been measured at t*=1.835 s (the applied force was approximately zero at this time), the total heat generated inside the cyclic plastic zone V p was calculated according to Eqs (5) and (6). To evaluate the last contribution on the right hand side of Eq.…”

“…umerical or experimental evaluation of plastic dissipation at the tip of fatigue cracks have attracted the attention of several researchers, who investigated, just as few examples, crack propagation assessment criteria [1,2], the thermal effects on stress intensity factors [3,4], the plastic zone size and energy dissipation [5][6][7]. In the field of the experimental approaches, the development of infrared cameras having increased performances (for example in terms of thermal sensitivity, spatial resolution and frame rate) has given impulse to temperature-related fatigue studies.…”

Infrared thermography-based evaluation of the elastic-plastic J-integral to correlate fatigue crack growth data of a stainless steel

“…Concerning Fracture Mechanics problems, in the last decades several temperature-related studies were carried-out, as the local heating at the crack tip [2][3][4], the crack propagation assessment based on the hysteresis energy [5][6][7][8][9][10][11][12][13][14][15][16], the thermal effects on stress intensity factors [17,18], the plastic zone size evaluation and the heat energy dissipation at the crack tip [19][20][21][22][23][24][25][26][27] and the correlation of energy dissipation at the crack tip with the J-integral [28][29][30].…”

On relation between J-integral and heat energy dissipation at the crack tip in stainless steel specimens

“…he development of infrared cameras having increased performances in terms of thermal sensitivity, spatial resolution and frame rate has given impulse to several experimental investigations involving the evaluation of temperature in Facture Mechanics problems. Some fields where infrared cameras have allowed an enhanced insight include: the investigation of local heating at the crack tip [1][2][3], the assessment of crack propagation based on the hysteresis energy [4][5][6][7][8][9][10][11][12][13][14][15], the influence of thermal effects on stress intensity factors [16,17], the evaluation of the plastic zone size and its correlation to the heat energy dissipation at the crack tip [18][19][20][21][22][23][24][25][26] and the correlation of energy dissipation at the crack tip with the J-integral [27][28][29].…”