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One of the main failure modes of laminate structures is interfacial failure by interlaminar failure or debonding. Interlaminar failure can be simulated with a model called cohesive zone approach A key ingredient of a cohesive zone approach is a traction-separation law that describes the softening in the crack zone near the tip of interlaminar failure. This simulation utilized the implementation of a cohesive zone approach with traction-separation laws, which implemented within the thin elastic layer feature of the Solid Mechanics interface in a COMSOL Multiphysics analysis software’s on a sample of composite material APC-2/AS-4. The capabilities of the cohesive zone approach to predict mixed mode effect in the beginning and propagation of the crack are demonstrated in a model of mixed-mode bending test. Both load and displacement are measured at the crack interface. The maximum load that carried by the sample used was 257.8 N. Whereas the maximum displacement was 6 mm as a load-displacement curve was shown.

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Monel 400 nickel alloy and AISI 304 austenitic stainless steel dissimilar fusion welding influenced in very important fields like oil, nuclear, space industries and petrochemical where high temperatures and corrosive environments are involved with weldments. Also, this dissimilar joint extremely important with environments demand high heat resistance, corrosion resistance, resistance thermal cycles consequences, creep resistance and good mechanical properties. One of the most important advantages of dissimilar welds is saving of novel and expensive materials cost. Dissimilar welding joints in this research produced with gas tungsten arc welding techniques (GTAW) and ENiCrFe-2 filler. Welding joint configuration simulated welding joint design in real working site to achieved best results and asses real welding site up. SEM/EDS analysis, optical microstructure examination, Vickers microhardness test, tensile test and V-notch impact test employed to study and understand welding microstructure details and properties and its impacts in weldment mechanical properties. Research results reveals formation of partial melting zone (PMZ), unmixed zone (UZ) and second phase in HAZ while dendritic solidification with heat flow direction, epitaxial growth, cellular epitaxial solidification and migrated grain boundaries (MGBs) observed in welding zone microstructure, this research deeply analyses formation of these phenomena, and its effects on weldments mechanical properties were discussed. This research results are very important to welding technologist and engineers to understand and prediction resultant welding zone and HAZ microstructures and understanding its impacts on required weldments design criteria when establish welding procedure.