PSI - Issue 68

M. Dudyk et al. / Procedia Structural Integrity 68 (2025) 53–58 M. Dudyk et al. / Structural Integrity Procedia 00 (2025) 000–000

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Fig. 2. The process zone parameters dependence on the dimensionless loading parameter σ. Dashed lines are for n= 0,5; solid lines are for n= 2. The phase angle of the external loading 1) ; 2) ; 3) . !" ! = " ° ! ! = ° !" ! = °

Fig. 3. The process zone parameters dependence on the external loading phase angle for σ=0,1: 1) n= 0,5; 2) n= 1; 3) n= 2.

Fig. 4 shows the dependence of the normalized energy release rate in the process zone on the dimensionless loading parameter σ for partial cases of the Young's moduli ratio of the bonded materials E 1 /E 2 <1 and ν 1 =ν 2 =0.3. Cases of E 1 /E 2 >1 are not considered because they give identical results to E 1 /E 2 <1 after interchange of material characteristics. It is quite expected that G' increases as the load increases, acquiring the largest values for the identical materials ( E 1 /E 2 →1). At the same time, the value of the normalized rate of energy release in the process zone for a given load parameter σ does not depend neither on the phase angle of the load nor on the ratio of the bonding material limiting tensile and shear stresses. ! ! " " # $ %&" ' !" # # $ % ! = "# $ ! " # $ !" !" !" # # # = +

Fig. 4. Energy release rate vs. loading modulus.