scholarly journals Numerical study of mode I fracture toughness of carbon-fibre-reinforced plastic under an impact load

2019 ◽  
Vol 234 (1) ◽  
pp. 12-20
Author(s):  
JJM Machado ◽  
PDP Nunes ◽  
EAS Marques ◽  
RDSG Campilho ◽  
Lucas FM da Silva
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Carbon Fibre ◽  
Strain Rate ◽  
Cohesive Zone ◽  
Impact Load ◽  
Mode I ◽  
Cohesive Zone Modelling ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic

The main objective of this work is, by using cohesive zone modelling, to compute the fracture toughness behaviour in mode I of unidirectional carbon-fibre-reinforced plastic subjected to an impact load at 4.7 m/s. To perform this task, double-cantilever beam specimens were simulated, with its opening displacement and crack propagation being assessed, as well as the evolution of strain rate through the test. Therefore, by plotting the crack propagation, it was possible to calculate the fracture toughness in mode I ( GIC). A comparison of the numerical results with experimental tests previously performed by using a drop weight falling-wedge impact test equipment was made, allowing to infer that the numerical approach, based on a triangular cohesive zone modelling, is capable to predict the behaviour of such specimens under impact, accurately obtain GIC, and to determine the value of strain rate achieved through the test.

Mode I fracture toughness of CFRP as a function of temperature and strain rate

2016 ◽  
Vol 51 (23) ◽  
pp. 3315-3326 ◽  
Author(s):  
JJM Machado ◽  
EAS Marques ◽  
RDSG Campilho ◽  
Lucas FM da Silva
Keyword(s):  
Strain Rate ◽  
Automotive Industry ◽  
Composite Structures ◽  
Numerical Study ◽  
Mode I ◽  
Strain Rates ◽  
Mode I Fracture Toughness ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic ◽  
The Impact

Composite structures currently used in the automotive industry must meet strict requirements for safety reasons. They need to maintain strength under varied temperatures and strain rates, including impact. It is therefore critical to fully understand the impact behaviour of composites. This work presents experimental results regarding the influence of a range of temperature and strain rates on the fracture energy in mode I, GIC, of carbon fibre reinforced plastic plates. To determine GIC as a function of temperature and strain rate, double cantilever beam specimens were tested at 20, 80 and −30℃, with strain rates of 0.2 and 11 s−1. A complementary numerical study was performed with the aim of predicting strength using the measured values. This work has demonstrated a significant influence of the strain rate and temperature on GIC of the composite materials, with higher strain rates and lower temperatures causing a decrease in the GIC values.

Impact and Damage Localisation of Carbon-Fibre-Reinforced Plastic Plates

PAMM ◽  
2011 ◽  
Vol 11 (1) ◽  
pp. 639-640 ◽  
Author(s):  
Andy Ungethuem ◽  
Rolf Lammering
Keyword(s):  
Carbon Fibre ◽  
Reinforced Plastic ◽  
Carbon Fibre Reinforced Plastic

scholarly journals Mixed-Mode Interlaminar Fracture Toughness of Glass and Carbon Fibre Powder Epoxy Composites—For Design of Wind and Tidal Turbine Blades

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2103
Author(s):  
Christophe Floreani ◽  
Colin Robert ◽  
Parvez Alam ◽  
Peter Davies ◽  
Conchúr M. Ó. Brádaigh
Keyword(s):  
Fracture Toughness ◽  
Carbon Fibre ◽  
Composite Structures ◽  
Mixed Mode ◽  
Epoxy Composites ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
Interlaminar Fracture Toughness ◽  
Interlaminar Fracture

Powder epoxy composites have several advantages for the processing of large composite structures, including low exotherm, viscosity and material cost, as well as the ability to carry out separate melting and curing operations. This work studies the mode I and mixed-mode toughness, as well as the in-plane mechanical properties of unidirectional stitched glass and carbon fibre reinforced powder epoxy composites. The interlaminar fracture toughness is studied in pure mode I by performing Double Cantilever Beam tests and at 25% mode II, 50% mode II and 75% mode II by performing Mixed Mode Bending testing according to the ASTM D5528-13 test standard. The tensile and compressive properties are comparable to that of standard epoxy composites but both the mode I and mixed-mode toughness are shown to be significantly higher than that of other epoxy composites, even when comparing to toughened epoxies. The mixed-mode critical strain energy release rate as a function of the delamination mode ratio is also provided. This paper highlights the potential for powder epoxy composites in the manufacturing of structures where there is a risk of delamination.

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