Experimental Investigation of Delamination Growth in Composite Laminates under a Compressive Load

Abstract

This paper focuses on the use of no-contact experimental techniques for monitoring the interlaminar damage evolution in composite laminates. Indeed, Infrared Thermography and Digital Image Correlation are adopted to investigate, in composite plates with artificial delamination, the influence of the delamination initial position on the delamination growth. The paper also investigates the feasibility of using a no-contact experimental technique for the measurement of displacement and strain during mechanical tests, such as the Digital Image Correlation, to evaluate, by means of indirect measurements, the delamination growth as a function of the applied load.

Improving the fracture toughness of glass/epoxy laminates through intra-yarns hybridisation

“…Then specimen was reloaded at the constant rate 0.5 mm/min until the crack growth had been accomplished. The interlaminar fracture toughness of mode-II can be found by means of the following equation (8):…”

“…1–3 Nevertheless, these laminates are particularly prone against delamination, which strongly reduces their properties such as the load-bearing capacity, compression strength, toughness, and fatigue life. 4–12 Therefore, the study to enhance the interlaminar fracture toughness of glass fibre laminates has drawn the attention of the designers and composites manufacturers. Delamination or inter-ply separation is the most predominant and crucial failure mechanism in composite laminates.…”

Evolution of Longitudinal Resistance Performance of Granular Ballast Track with Durable Dynamic Reciprocated Changes

“…Hence, based on particle image velocimetry (PIV) image identi cation technology, the motion law of ballast grains under longitudinal loading of track frames was analyzed [13,17]. Images of the ballast surface were taken using a digital camera for observing and measuring ballast movement during the tests [25], as shown in Figure 8. e digital camera was set above the ballast, and the image scales were approximately 3.5 pixels per millimeter for the 1,000 mm wide testing area.…”

Experimental investigations on flexural behaviour of delaminated carbon/epoxy composite using three dimensional digital image correlation

“…The position of delamination in thickness direction did not affect considerably the compressive strength. Riccio et al 13 studied the behaviour of composite plates with single circular delamination under compressive load. The existence of side delamination in the specimen highly affected the stiffness and buckling load of the material.…”