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Design curves for the relationship between relative interfacial strength and stiffness. The relative capsule strength is 3: row (A1–A3) and row (B1–B3) have relative interfacial toughness of 0.9 and 0.1, respectively. Finally, the values of relative interfacial strength are as follows: (A1/B1) 2 × 10−2, (A2/B2) 5 × 10−2, and (A3/B3) 1 × 10−1.
