Composite material body for impact absorption and articles comprising the body

A wheel rim (40) comprising:

• an annular frame (50) having an upper arc portion (501), a lower arc portion (502) and two connection portions (503), two ends of each of the connection portions (503) respectively connected to the upper arc portion (501) and the lower arc portion (502) so as to define a space (51) which is arranged around an inside of a body of the annular frame (50);
• two wing portions (53), for mounting a tire therebetween, protruding from an outer peripheral wall of the upper arc portion (501) of the annular frame (50) and being oppositely located at two sides of the annular frame (50);
• and
• two composite material bodies (10) respectively provided at positions where the two connection portions (503) are connected to the upper arc portion (501),
• each of the two composite material bodies (10) comprising:
• a first material layer (20);
• and
• a second material layer (30) connected to the first material layer (20);
• wherein the first material layer (20) and the second material layer (30) are connected and then wound to make the second material layer (30) be situated outside the first material layer (20) so as to form a flexible and circular rod whose diameter is between 0.3 mm and 5.0 mm,
• wherein before the first material layer (20) and the second material layer (30) are wound, the first material layer (20) is joined to an edge of the second material layer (30), and
• wherein a proportion of a whole area of the first material layer (20) to that of a sum of the first material layer (20) and the second material layer (30) is between 1:1 and 1:5.