Fig. 8

The results of the tensile tests in the three groups, n = 3. a The stress–strain curve of the tensile test in the bulk region. b The tensile modulus in the three groups in the bulk region, *P < 0.05. c The toughness in the three groups in the bulk region, *P < 0.05. d The stress–strain curve of the tensile test at the radial direction. e The tensile modulus in the three groups at the radial direction, *P < 0.05. f The toughness in the three groups at the radial direction, *P < 0.05. g The stress–strain curve of the tensile test in the inner region. h The tensile modulus in the three groups in the inner region, *P < 0.05. i The toughness in the three groups in the inner region, *P < 0.05. j The stress–strain curve of the tensile test in the outer region. k The tensile modulus in the three groups in the outer region, *P < 0.05. l The toughness in the three groups in the outer region, *P < 0.05