PSI - Issue 33

Victor Rizov et al. / Procedia Structural Integrity 33 (2021) 402–415 Author name / Structural Integrity Procedia 00 (2019) 000–000

408

7

hda G dU  .

(21)

Fig. 4. Two three-layered functionally graded cantilever beam configurations with a delamination crack located between (a) layers 2 and 3 and (b) layers 1 and 2. The left-hand delamination crack arm is free of stresses. Therefore, the strain energy in the beam is written as

UN RH U U U   ,

(22)

UN U are the strain energies cumulated in the right-hand delamination crack arm and the un

RH U and

where

cracked beam portion, respectively. The strain energy in the right-hand delamination crack arm is found as