cfrp laminates
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2022 ◽  
Vol 218 ◽  
pp. 109200 ◽  
Author(s):  
Jing Zhou ◽  
Yingguang Li ◽  
Zexin Zhu ◽  
Eyan Xu ◽  
Shengping Li ◽  
...  

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Yichi Song ◽  
Doneill J. Magmanlac ◽  
Vito L. Tagarielli

AbstractWe propose and assess a procedure to measure the damage evolution in solids as a function of the applied strain, by conducting stiffness-sensing mechanical tests. These tests consist in superimposing to a monotonically increasing applied strain numerous, low-amplitude unloading/reloading cycles, and extracting the current stiffness of the specimens from the slope of the stress–strain curve in each of the unloading/reloading cycles. The technique is applied to a set of polymeric and metallic solids with a wide range of stiffness, including CFRP laminates loaded through the thickness, epoxy resins, injection-moulded and 3D printed PLA and sintered Ti powders. The tests reveal that, for all the materials tested, damage starts developing at the very early stages of deformation, during what is commonly considered an elastic response. We show that the test method is effective and allows enriching the data extracted from conventional mechanical tests, for potential use in data-driven constitutive models. We also show that the measurements are consistent with the results of acoustic and resistive measurements, and that the method can be used to quantify the viscous response of the materials tested.


Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 222
Author(s):  
Sheikh Rehman ◽  
Julio Gomez ◽  
Elvira Villaro ◽  
Dwane Cossey ◽  
Panagiotis G. Karagiannidis

In this work, we report the synthesis and study of nanocomposites with a biobased epoxy/amine (Epilok 60-600G/Curamine 30-952) matrix reinforced with reduced graphene oxide (rGO) or functionalised with 3-glycidoxypropyltrimethoxysilane (GLYMO-rGO). These graphene related materials (GRMs) were first dispersed into a Curamine hardener using bath ultrasonication, followed by the addition of epoxy resin. Curing kinetics were studied by DSC under non-isothermal and isothermal conditions. The addition of 1.5 wt% of GLYMO-rGO into the epoxy matrix was found to increase the degree of cure by up to 12% and glass transition temperature by 14 °C. Mechanical testing showed that the addition of 0.05 wt% GLYMO-rGO improves Young’s modulus and tensile strength by 60% and 16%, respectively, compared to neat epoxy. Carbon fibre reinforced polymer (CFRP) laminates were prepared via hand lay up, using the nanocomposite system GRM/Epilok/Curamine as matrix, and were cut as CFRP adherents for lap shear joints. GRM/Epilok/Curamine was also used as adhesive to bond CFRP/CFRP and CFRP/aluminium adherents. The addition of 0.1 wt% GLYMO-rGO into the adhesive and CRFP adherents showed improved lap shear strength by 23.6% compared to neat resin, while in the case of CFRP/Aluminium joints the increase was 21.2%.


2022 ◽  
pp. 115209
Author(s):  
Jeroen Vandendriessche ◽  
Adil Han Orta ◽  
Erik Verboven ◽  
Wim Van Paepegem ◽  
Koen Van Den Abeele ◽  
...  
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AIP Advances ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 015010
Author(s):  
Jiawei Wang ◽  
Chongyu Lin ◽  
Guobin Feng ◽  
Bin Li ◽  
Lixiong Wu ◽  
...  

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