Effect of Crack-Parallel Compression or Tension on Mode-I Fracture Energy of Quasibrittle Material – As Applied to Concrete

2021 ◽  
pp. 55-59
Author(s):  
Hoang Thai Nguyen ◽  
Masoud Rezaei ◽  
Madura Pathirage ◽  
Gianluca Cusatis ◽  
Mohsen Issa ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Mode I ◽  
Mode I Fracture ◽  
Quasibrittle Material

scholarly journals Comparative study of elastic properties and mode I fracture energy of carbon nanotube/epoxy and carbon fibre/epoxy laminated composites

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Jyotikalpa Bora ◽  
Sushen Kirtania
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fibre ◽  
Fracture Energy ◽  
Elastic Properties ◽  
Volume Fraction ◽  
Laminated Composites ◽  
Laminated Composite ◽  
Fe Analysis ◽  
Mode I ◽  
Mode I Fracture

Abstract A comparative study of elastic properties and mode I fracture energy has been presented between conventional carbon fibre (CF)/epoxy and advanced carbon nanotube (CNT)/epoxy laminated composite materials. The volume fraction of CNT fibres has been considered as 15%, 30%, and 60% whereas; the volume fraction of CF has been kept constant at 60%. Three stacking sequences of the laminates viz.[0/0/0/0], [0/90/0/90] and [0/30/–30/90] have been considered in the present analysis. Periodic microstructure model has been used to calculate the elastic properties of the laminated composites. It has been observed analytically that the addition of only 15% CNT in epoxy will give almost the same value of longitudinal Young’s modulus as compared to the addition of 60% CF in epoxy. Finite element (FE) analysis of double cantilever beam specimens made from laminated composite has also been performed. It has been observed from FE analysis that the addition of 15% CNT in epoxy will also give almost the same value of mode I fracture energy as compared to the addition of 60% CF in epoxy. The value of mode I fracture energy for [0/0/0/0] laminated composite is two times higher than the other two types of laminated composites.

Effect of Low Temperature on Tensile Strength and Mode I Fracture Energy of a Room Temperature Vulcanizing Silicone Adhesive

2015 ◽  
Vol 44 (3) ◽  
pp. 20140208 ◽  
Author(s):  
E. A. S. Marques ◽  
M. D. Banea ◽  
Lucas F. M. da Silva ◽  
R. J. C. Carbas ◽  
C. Sato
Keyword(s):  
Tensile Strength ◽  
Low Temperature ◽  
Fracture Energy ◽  
Room Temperature ◽  
Mode I ◽  
Mode I Fracture ◽  
Silicone Adhesive

scholarly journals Mode-I Metal-Composite Interface Fracture Testing for Fibre Metal Laminates

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Periyasamy Manikandan ◽  
Gin Boay Chai
Keyword(s):  
Finite Element ◽  
Fracture Energy ◽  
Interface Fracture ◽  
Mode I ◽  
Metal Composite ◽  
Fibre Metal Laminates ◽  
Mode I Fracture ◽  
Metal Plasticity ◽  
Composite Interface ◽  
Fibre Metal

The main contribution of the present paper is the determination of the mode-I fracture of metal-composite interface region for fibre metal laminates (FMLs). A hybrid DCB configuration is proposed to investigate the mode-I fracture between metal-composite interface using experimental and numerical approaches. A computationally efficient and reliable finite element model was developed to account for the influence of metal plasticity on the measured fracture energy. The results of the experimental and numerical studies showed that metal plasticity increases the fracture energy of the metal-composite interface as the fracture event progresses. The applied energy truly utilized to propagate metal-composite interface fracture was predicted numerically by extracting the elastic strain energy data. The predicted true fracture energy was found to be approximately 50% smaller than the experimentally measured average propagation energy. The study concluded that metal plasticity in hybrid DCB configuration overpredicted the experimentally measured fracture energy, and this can be alleviated through numerical methodology such as the finite element approach as presented in this paper.

scholarly journals Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Jiajun Shi ◽  
Yunfeng Pan ◽  
Hedong Li ◽  
Jun Fu
Keyword(s):  
Moisture Content ◽  
Fracture Energy ◽  
Water Immersion ◽  
Adhesive Layer ◽  
Bending Test ◽  
Mode I ◽  
Mode I Fracture ◽  
Four Point Bending ◽  
Four Point Bending Test ◽  
Hygrothermal Stress

The effectiveness of load transfer in the CFRP-adhesive-concrete system highly relies on the integrity of the interfacial bond between adhesive layer and concrete. In the present paper, the effects of water immersion on the mode I fracture energy of the adhesion between CFRP adhesive and concrete were investigated experimentally and numerically. Four-point bending test was conducted to measure the mode I fracture energy of the interfacial layer between adhesive and concrete. The moisture content distribution and the hygrothermal stress were determined by using the finite element method (FEM). The mode I fracture energy was found decreasing with increasing immersion time. The difference between the mode I fracture energy at 2 weeks and 4 weeks is rare. The failure mode of the four-point bending test specimen shifts from concrete failure to interfacial debonding. The moisture content at the adhesive/concrete interface reaches equilibrium after 2 weeks of water immersion. The hygrothermal stress between adhesive and concrete is smaller than the tensile strength of concrete. Deterioration of the physical bond leads to the degradation of bonding strength. The reduction of the mode I fracture energy is more severe than that of the mode II fracture energy.

Characterization of the mode I fracture energy of adhesive joints

2006 ◽  
Vol 26 (8) ◽  
pp. 644-650 ◽  
Author(s):  
G. Steinbrecher ◽  
A. Buchman ◽  
A. Sidess ◽  
D. Sherman
Keyword(s):  
Fracture Energy ◽  
Adhesive Joints ◽  
Mode I ◽  
Mode I Fracture
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