Failure maps to assess bearing performances of glass composite laminates

Abstract

FIG. 4. Images of (a) shear out fracture on G_4_4_15, (b) net tension fracture on G_8_8_15, and (c) bearing fracture on G_6_15_15. [Color figure can be viewed at wileyonlinelibrary.com] FIG. 5. Bearing stress-displacement curves at varying edge distance for samples with (a) 4 mm and (b) 8mm hole diameter. [Color figure can be viewed at wileyonlinelibrary.com] FIG. 7. (a) Mesh 3D surface plot and (b) failure mechanisms map on mesh 3D surface plot of bearing stress at varying E/D and W/D parameters. [Color figure can be viewed at wileyonlinelibrary.com]

Pinned Hybrid Glass-Flax Composite Laminates Aged in Salt-Fog Environment: Mechanical Durability

“…However, structural joints, although often required at the design level, are high stress concentration points that make this region sensitive to damage. Several factors can influence the composite joint strength, such as the preload moment [5], temperature [6], environmental conditions [7], and geometric parameters [8]. The pinned joints with different geometrical parameters highlight different failure modes, and the damage activation phenomena in the composite materials can be foreseen using failure criteria [9].…”

“…This makes the mechanical stability and durability design of hybrid joints in aggressive environments very complex. The evaluation of strength variation must be synergistically integrated with the occurred fracture mechanism in the joint [6,23]. The former should be excluded or limited in time, and the latter should preferably be preserved.…”

An Aging Evaluation of the Bearing Performances of Glass Fiber Composite Laminate in Salt Spray Fog Environment

“…In this context, the kind of failure mechanism (i.e., bearing, net-tension, shear out and cleavage), and consequently, the capability of pinned laminates to support a load was investigated as a function of their geometrical parameters [9][10][11][12][13]. In particular, in our recent paper [14], pinned, glass-reinforced laminates were tested with varying hole diameter D, laminate width W and hole center distance from the free edge of laminate, E; thus, highlighting that the pin-loaded composite configuration has a relevant influence on the mechanical stability and on the joint-failure mechanism.…”

Fracture and mode mixity analysis of shear deformable composite beams

“…As the composite materials play important role in the industrial applications [11], the strong adhesion between the laminated layers is essential and must remain reliable even at high strains and high stresses [15]. Presence and propagation of a delamination in lightweight composite materials [35,38] can significantly decrease the load bearing capability of the structure [7,26,28], modify the dynamic properties [6,20,27,39,40], and furthermore, they can easily lead to sudden and catastrophic failure of the brittle mechanical system. Thus, the description [22,36] and the avoidance [10,59] of an interlaminar failure, which may take place because of low-velocity impact [5,24], blast loading [32,37], manufacturing defects [16][17][18] and free edge effects [13], are inevitable from engineering point of view.…”