Buckling-driven delamination is considered among the most critical failure modes in composite laminates. This paper examines the propagation of delaminations in a beam under pure bending. A pre-developed analytical model to predict the critical buckling moment of a thin sub-laminate is extended to account for propagation prediction, using mixed-mode fracture analysis. Fractography analysis is p...

In this paper, three-dimensional modeling of the fatigue crack growth profiles was performed in a simple riveted lap joint. Simulation results showed that mode I was dominated on the one side of the plates and the crack straightly grew on this side, while the other side of the plates was in a mixed-mode condition and the crack propagation path was not straight on this side. Afterward, the fract...

Based on the engineering background of water dissolving mining for hydrocarbon storage in multi-laminated salt stratum, the mixed mode fracture toughness and fracture trajectory of gypsum interlayers soaked in half-saturated brine at various temperatures (20°C, 50°C and 80°C) were studied by using CSNBD (centrally straight-notched Brazilian disc) specimens with required inclination angles (0°, ...

Abstract Unfortunately, fibrous composite materials' mixed-mode fracture toughness ( K eff ) was measured using inappropriate through-thickness cracked (TTC) specimens. The problem with such specimens is the ignorance of fibers in pre-notch surfaces, i.e., no fiber bridging behind crack tip. In present paper, a real fiber-reinforced concrete (FRC) experimentally determined matrix (MC) Tradition...

Small-scale cohesive-zone models based on potential functions are expected to be consistent with the important features of linear-elastic fracture mechanics (LEFM). These include an inverse-square-root K-field ahead a crack, normal and shear stresses being proportional mode-I mode-II stress-intensity factors, KI KII, work done against crack-tip tractions equal KI2+KII2?E?, where E? is appropria...

Fracture analysis is a problem playing fundamental role in the fields of Aerospace Mechanics and Structural Mechanics. The paper deals with most essential among fracture problems: one-dimensional crack double cantilever beam. report presents reliable analytical method to correctly partition energy release rates into pure modes, appliable both isotropic composite beams clearly known mechanical p...