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Today fiber metal laminates (FMLs) by having good mechanical properties and low weight have been attention. The use of shape memory alloy (SMA) in the FMLs causes these alloys, under mechanical cyclic loading, by creation reversible hysteresis loop, can absorb or waste mechanical energy and causes amelioration of resistance against buckling instabilities of FMLs. In this study, the effect of increasing pre-strain and embedment SMA wire in far and near layers to neutral axis of FML, under static buckling were investigated. FMLs were contained epoxy resin and glass fibers and 2024-T3 Aluminum alloy. To investigate effect of pre-strain of SMA, the pre-strain of 1, 2 and 3 percent with fixed quantity 6 wires in these FMLs were tested. Due to investigate the position of embedment, the quantity of 4 wires with fixed 3% pre-strain, in far and near layers to neutral axis, are used. The results showed that the increase of pre-strain due to creation more tension of SMA during the fabrication of the specimens and the tendency of wires to return to its original shape during the test makes the structure more resistant against pressure loading. Also, the wires were placed in layers far from the neutral axis of the specimen as compared to near the neutral axis due to the greater effect of the bending resistance of the specimen during the buckling and the effect of the better return properties of SMA wires, causes to increasing resistance against instability and load tolerance limit in FMLs.

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Inconel 718 superalloy is widely used in various industries due to its excellent high-temperature properties. The production of components made from Inconel 718 superalloy through the Selective Laser Melting (SLM) method enables the fabrication of parts with complex geometries. Therefore, improving the mechanical properties of parts produced by SLM using secondary strengthening processes is of great importance. This study investigates the effect of cold pre-strain on the tensile and compressive strength of Inconel 718 superalloy samples produced by SLM. The test specimens were produced by the SLM method and subjected to single-stage (5%-15%-30%) and two-stage (4%-12%-16%) loading. To examine the impact of initial loading on mechanical properties, tensile, compression, and hardness tests were performed, and the microstructure behavior was analyzed using an optical microscope. The results indicate that the yield strength and ultimate tensile strength of the Inconel 718 superalloy in the Y-axis (XY plane) increased by 31.8% and 11.6%, respectively, after applying a 30% initial strain along the Z-axis. The compressive yield strength of Inconel 718 superalloy increased by 79.3% in the Z-direction with a 30% pre-strain. In other words, applying pre-strain along the Z-axis affects the compressive strength in the XZ plane as the principal strain and the tensile strength in the XY plane as the shear strain. Increasing pre-strain to 30% has a minimal effect on the hardness properties of Inconel 718 superalloy. The results from the two-stage loading process indicate an enhancement in strength with the increase in the number of loading stages, attributed to the work-hardening phenomenon