New PDF release: Design Guide for FRP Composite Connections

By Ayman S., Ph.D. Mosallam

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These limit states are as follows: • Serviceability Limit State: deflection limits, rotational limits, cracking limits, vibration limits, instability limits, and human response limits must be established in a manner similar to span-to-depth ratios, thickness of flange, web-to-width or -depth ratios, and so on. • Strength Limit State: factored resistance shall be the product of nominal resistance determined as stated above; the resistance factors vary for flexure, shear, compression parallel and perpendicular to units, and tension parallel to units.

The limited available information on fatigue behavior of composite bolted joints suggests that lifetimes of several million cycles can be expected for loads as high as 70% of the joint static strength of Figure 2-16. Failure of composite threaded rods under fully reversed cyclic loading. Mallick (1988) conducted a similar study to investigate the effects of hole stress concentration and its mitigation on the tensile strength of sheet molding compound composites. In this study, it was observed that most fatigue cracks initiated at the fraying surfaces of the SMC-C30R20 composites, whereas fatigue cracks for SMC-R18 composite joints originated around the washer edge on the outside surface.

2-3B). However, for highly orthotropic composites, shear-out failures occur at very large edge distances. Shear-out failure is a combination of in-plane and interlaminar shear failures. The shear-out failure can also be characterized by a single-plane “cleavage” failure, where the apparent laminate transverse tensile strength is less than the corresponding inplane shear strength. Bolted composite joints are usually designed to avoid this brittle mode of failure. Commonly, pure bearing joint specimens are used to determine the shear-out strength of composite joints.

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