Turbomachine blade, turbomachine and method for manufacturing the blade

A turbomachine blade comprising:

• an external shell comprising a pressure-side wall and a suction-side wall delimiting between them an interior volume,
• an insert arranged in the interior volume so as to form an air passage between the insert and the external shell;
• and
• at least one joining portion configured to break, connected at one end to the insert and at an other end to the external shell;
• wherein the at least one of a mechanical breaking resistance of the at least one joining portion, the mechanical breaking resistance between the at least one joining portion and the external shell and the mechanical breaking resistance between the at least one joining portion and the insert is less than the mechanical breaking resistance of the external shell and the mechanical breaking resistance of the insert, wherein at least one of the insert and the external shell is locally reinforced at its connection with the at least one joining portion.