Abstract
In the last decades, the increasing use of laminate materials, such as carbon fibre reinforced plastics, in several engineering applications has pushed researchers to deeply investigate their mechanical behavior, especially in consideration of the delamination process, which could affect their performance. The need for improving the capability of the current instruments in predicting some collapse or strength reduction due to hidden damages leads to the necessity to combine numerical models with experimental campaigns. The validation of the numerical models could give useful information about the mechanical response of the materials, providing predictive data about their lifetime. The purpose of the delamination tests is to collect reliable results by monitoring the delamination growth of the simulated in situ cracking and use them to validate the numerical models. In this work, an experimental campaign was carried out on high performance composite laminates with respect to the delamination mode I; subsequently, a numerical model representative of the experimental setup was built. The ANSYS Workbench Suite was used to simulate the delamination phenomena and modeFRONTIER was applied for the numerical/experimental calibration of the constitutive relationship on the basis of the delamination process, whose mechanism was implemented by means of the cohesive zone material (CZM) model.
Highlights
The use of composite materials has been steadily increasing worldwide in the last decades because of the development of tailoring facilities, allowing for the manufacturing of high performance structures for specific purposes
D5528 [18], with the aim of investigating the delamination process occurring in carbon/epoxy composites subjected to mode I test
D5528 [18], with the aim of investigating the delamination process occurring in carbon/epoxy composites subjected to mode Iamong test. the four calculation methods for fracture toughness is reported
Summary
The use of composite materials has been steadily increasing worldwide in the last decades because of the development of tailoring facilities, allowing for the manufacturing of high performance structures for specific purposes. This characteristic makes such materials highly attractive for applications in different engineering fields in replacement of traditional structural materials such as metals or concrete. It is not unusual to use composite materials for structural applications in aerospace, automotive, and maritime fields, as well as in civil engineering and for sport equipment This type of materials is exposed to numerous damage mechanisms that can strictly affect their performance, even in the absence of externally visible damages. That is to say, the loss of cohesion between layers, even known as delamination, is one of the most dangerous and common problems in composite
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