By Ayman S., Ph.D. Mosallam
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Extra info for Design Guide for FRP Composite Connections
It is possible that a grossly overtightened bolt could result in damage to the composite laminate by forcing the washer into the surface (Matthews 1988). However, for normal volume fractions this local damage is less likely to develop. Instead, for a reasonable hole-diameterto-thickness ratio (d/t), it is more likely that damage by stripping of the bolt threads will occur before laminate damage occurs. This process was observed for PFRP threaded rods in several full-scale studies (Mosallam et al.
John Hart-Smith and the Boeing Company. BOLTED COMPOSITE JOINTS 27 dependent on the compressive strength of the composites. , a given total cross-sectional area of bolts), the most effective strategy is to use several small-diameter bolts, rather than fewer large-diameter bolts, to generate a greater bearing area. Bearing failure occurs at the immediate adjacent contact zone between the bolt and the composite member, and, as mentioned earlier, is caused primarily by excessive compressive stresses that develop at the hole boundary surface (Eriksson et al.
The basic principle in designing mechanically fastened joints is that the material being joined should fail before the fastener (ASTM 2002). However, Mosallam and Schmitz (1996) and Mosallam (1999) reported that the major mode of failure of pultruded composite connections under cyclic loading is the failure of the pultruded composite threaded rods far 44 DESIGN GUIDE FOR FRP COMPOSITE CONNECTIONS earlier than noticeable damage to either the connecting element of the joined member (refer to Fig.