460 C h a p t e r 1 1 M a t e r i a l s S e l e c t i o n , Te s t i n g , a n d D e s i g n C o n s i d e r a t i o n s 461
(a)
(b)
FIGURE 11.23 Structural elements: (a) adequate support, severe crevice;
(b) good crevice resistance; (c) best crevice resistance.