ABSTRACT
We saw in Chapter 5 how to design the regular (or typical) area of a laminate so to sustain overall loads. Even more critical for the designer of acomposite part is the careful design of the attachmentsand joints of the parts between them. Here, we look at the assembly solutions involving riveting, bolting, and bonding of
◾ A composite part to another composite part ◾ A composite part to a metallic part
In any mechanical component, the presence of holes generates stress concentration factors. Especially in composite parts, holes (molded-in holes or drilled holes) induce local reduction of the failure strength in comparison to the same location but without holes. ”e knockdown factor is in the range of
◾ 40%–60% in tension ◾ 15%–50% in compression, depending on whether the hole is lled by afastening pin or
is open
Example:Figure 6.1 illustrates the degradation process before failure of aglass/epoxy laminate containing a free hole, under uniaxial stress.
