Residual strength in notched composite materials

Effect of milled notches on the strength of open hole, filled holes, single and double lap shear CFRP tension coupons

“…This effect has been identified from an experimental point of view by many authors [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and demonstrated by a test-calculation dialogue using different, mostly discrete, modeling strategies [22][23][24][25][26][27][28][29]. This explains the interest in this type of fatigue damage, which, in some cases, would allow an increase in residual resistance [13][14][15][16][17][18][19][20][21]. In addition, it has been shown [27] that, depending on the position of the plies in the thickness, this type of damage is favored and consequently the static resistance can be improved by about 10%.…”

“…Because of this complexity, most academic research has been done under uniaxial tension and compression stresses at coupon scale because few models are able to represent these scenarios correctly, even though studies on technological specimens have recently started to be carried out with the discrete ply model "DPM" approach [6,7]. Among the elementary modes, splitting has held the attention of researchers for a long time in static [8][9][10][11][12] or in fatigue [13][14][15][16][17][18][19][20][21] loading and this mode is shown in Fig. 1.…”