PSI - Issue 47

5

Luciano Feo et al. / Procedia Structural Integrity 47 (2023) 800–811 Author name / Structural Integrity Procedia 00 (2019) 000–000

804

� �

�� � ��� ∙� 1 � 0.1 ∙ 0.00015 � �� 0.00015 � 0.9 ∙ ��� �� �� ��� ∙ � 1.0 � 0.8 ∙ � � � � ⎩⎪⎨ ⎪⎧ �� ∙ ��

�� � 0.9 ∙ ��� ��

(13)

��� �� � �� � 0.00015 � �

�� � 0.9 ∙

� � � �

(14)

��� ∙ � 0.25 � 0.05 � � � � � �

where �� (MPa), �� (MPa) and ��� (MPa) are the tensile elastic modulus, the tensile strain and the strength under tension load. The crack opening displacement, � , and the final displacement, � , which depend on the fracture energy, are evaluated by means of the following equations � � � ��� (15) � � 5 ∙ � (16) � � �� ∙ � �� ��� � � . �� (17) where is the parameter introduced in the novel formulation of the model to take into account the presence of nanofillers.

Figure 2 . Concrete stress-strain behavior in compression