A suitable mixed mode I/II test specimen for fracture toughness study of polyurethane foam with different cell densities

2021 ◽  
pp. 103171
Author(s):  
D.M. Imani ◽  
M.R.M. Aliha ◽  
E. Linul ◽  
L. Marsavina
Keyword(s):  
Fracture Toughness ◽  
Polyurethane Foam ◽  
Test Specimen ◽  
Mixed Mode ◽  
Mode I ◽  
Cell Densities ◽  
Fracture Toughness Study

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.

Numerical analysis of a new mixed mode I/III fracture test specimen

2015 ◽  
Vol 134 ◽  
pp. 95-110 ◽  
Author(s):  
M.R.M. Aliha ◽  
A. Bahmani ◽  
Sh. Akhondi
Keyword(s):  
Numerical Analysis ◽  
Test Specimen ◽  
Mixed Mode ◽  
Mode I ◽  
Fracture Test

Experimental and theoretical fracture toughness investigation of PUR foams under mixed mode I+III loading

2018 ◽  
Vol 67 ◽  
pp. 75-83 ◽  
Author(s):  
M.R.M. Aliha ◽  
E. Linul ◽  
A. Bahmani ◽  
L. Marsavina
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Mode I

scholarly journals Low temperature mixed-mode debond fracture and fatigue characterisation of foam core sandwich

2018 ◽  
Vol 22 (4) ◽  
pp. 1039-1054 ◽  
Author(s):  
Arash Farshidi ◽  
Christian Berggreen ◽  
Leif A Carlsson
Keyword(s):  
Fracture Toughness ◽  
Growth Rate ◽  
Low Temperature ◽  
Mixed Mode ◽  
Room Temperature ◽  
Sliding Mode ◽  
Fatigue Tests ◽  
Mode I ◽  
Foam Core ◽  
Climatic Chamber

This paper experimentally investigates the effects of low temperature on fracture toughness and fatigue debond growth rate in foam core sandwich composites. Mixed-mode bending specimens were statically and cyclically tested inside a climatic chamber at a low temperature (−20°C) and at room temperature (23°C) as a reference. Testing was conducted in mode I (opening) and mixed-mode I/II (opening-sliding) mode mixities. The fatigue tests results are presented according to the modified Paris–Erdogan relation. Results showed substantial fracture toughness reduction due to low temperature. Low temperature furthermore elevated the cyclic crack growth rate.

Sign in / Sign up

Export Citation Format

Share Document