Computational Analysis of Crack Growth in Composite Materials Using Lennard-Jones Type Potential Function

2008 ◽  
pp. 309-316 ◽  
Author(s):  
H. Murakawa ◽  
H. Serizawa ◽  
Z. Q. Wu
Keyword(s):  
Composite Materials ◽  
Crack Growth ◽  
Potential Function ◽  
Computational Analysis ◽  
Lennard Jones ◽  
Type Potential

A Disposable PVDF Sensor Applied for the Detection of Fatigue Crack Growth in Bonded Composite Joints

2002 ◽  
Author(s):  
Oh-Yang Kwon ◽  
Dana Brosig ◽  
Kalyan Nistala ◽  
Yuris A. Dzenis
Keyword(s):  
Fatigue Crack ◽  
Composite Materials ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Composite Structures ◽  
Lap Joints ◽  
Pvdf Film ◽  
Film Sensor ◽  
Current Limit ◽  
Ae Signals

The application of polyvinylidene di-fluoride (PVDF) film as an acoustic emission (AE) sensor appears to be practical to detect the fatigue crack growth in composite materials and structures. A commercially available PVDF film sensor was employed to detect AE due to fatigue crack growth in the single-lap joints of graphite/epoxy laminates. Although the signal-to-noise ratio is not as high as those measured by PZT sensors, the result showed that the location of crack front could be predicted by the linear location of AE signals detected by the PVDF sensors. Since the composite materials usually produce very energetic AE signals, the extremely cost-effective form of PVDF sensors can be permanently mounted on composite structures for structural health monitoring as disposable ones. Piezoelectric polymer sensors are expected to be eventually embedded in composite structures provided the current limit of use temperature being increased by introducing co-polymerization with some heat resistant constituents.

Water Molecule and Atoms Inside C60 Fullerene

2020 ◽  
Vol 17 (7) ◽  
pp. 2955-2961
Author(s):  
Prangsai Tiangtrong
Keyword(s):  
Water Molecule ◽  
Interaction Energy ◽  
Potential Function ◽  
External Force ◽  
Exact Formula ◽  
C60 Fullerene ◽  
Lennard Jones Potential ◽  
Jones Potential ◽  
Lennard Jones ◽  
Single Water Molecule

In this research, we are interested in the non-bonded interactions between a single water molecule and the atoms Li, Na, K, Rb, Cs, Ca, Ni, Zn and Pb inside a C60 fullerene using the Lennard-Jones potential function. We assume that a single water molecule is inside the endofullerene and determine the exact formula of the interaction energy between the water molecule and the fullerene. Then we determine the interaction energy between an atom and the endofullerene to consider the interaction behaviours of each atom inside the fullerene. The results show that a water molecule does not desire to be encapsulated inside the fullerene. Similarly, Rb, Cs and Pb act the same behaviour, where they are not stable inside the fullerene. However, some atoms which are Li, Na, K, Ca, Ni and Zn can be inside the endofullerene. Hence, the creation of endofullerene with a single water molecule or Rb, Cs and Pb inside, an external force must be applied while that force is not necessary for Li, Na, K, Ca, Ni and Zn.

Sign in / Sign up

Export Citation Format

Share Document