Conclusion
In the present work we investigated the anisotropy of the characteristics of tensile (buckling) strength and elasticity of plates made of KMU-4L in a bolted joint in a wide range of parameters of the material (stacking, number of layers), geometric parameters of the joint, parameters of the fastening element and of design parameters. An analysis of the results showed that the strength of the bolted joint under static loading can be increased for thin plates with h = 1–2 mm by local reinforcement of the zone of the hole by layers with θ = ±45 °, and also by increasing the moment of preliminary tightening; for plates with h = 3–4 mm the only feasible measure is increasing the moment of preliminary tightening to 20–40 Nm. All the results of the experiment were graphically generalized in the form of surfaces of maximal stress; this made it possible to predict the load bearing capacity of a joint for intermediate values of the parameters by calculating the safety factors.
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Translated from Mekhanika Kompozitnykh Materialov, No. 2, pp. 268–272, March–April, 1990.
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Leonova, I.E., Semin, M.I. Experimental investigation of the anisotropy of strength of bolted joints of laminated composites upon variation of geometric and design parameters. Mech Compos Mater 26, 216–220 (1990). https://doi.org/10.1007/BF00612322
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DOI: https://doi.org/10.1007/BF00612322