Molecular Dynamics Study on Interfacial Fracture of Aluminum Alloy and Epoxy Resin Adhesive Subjected to Cyclic Loading

2020 ◽  
Author(s):  
Kohei Kanamori ◽  
Yoshikatsu Kimoto ◽  
Akio Yonezu
Keyword(s):  
Molecular Dynamics ◽  
Aluminum Alloy ◽  
Cyclic Loading ◽  
Strain Rate ◽  
Epoxy Resin ◽  
Adhesion Strength ◽  
Tensile Deformation ◽  
Critical Role ◽  
Interfacial Fracture ◽  
Curing Temperature

Abstract Direct bonding of metal-resin plays a critical role in jointing of dissimilar materials and the adhesion strength is known to be dependent on strain rate (loading rate) due to the strain rate sensitivity of polymeric resin. This study evaluated adhesion strength and adhesion durability against repetitive loading for the interface between aluminum alloy and epoxy resin. For experiment, a pulsed YAG laser was used to generate strong elastic waves, resulting in interfacial fracture. This method is called Laser Shock Adhesion Test (LaSAT), which enables us to evaluate impact strength of interfacial fracture. This study prepared two types of specimens with different curing temperature (20°C and 100°C). It is found that the specimen with higher temperature curing shows larger adhesion strength. Subsequently, repetitive LaSAT experiments (cyclic loading tests) were conducted to evaluate adhesion durability. This reveals that adhesion strength showed cyclic fatigue characteristics and higher curing temperature improves fatigue strength. To elucidate this mechanism at molecular level, molecular dynamics (MD) simulation was conducted for the interfacial material with epoxy resin. This study created all-atomistic model of Al2O3/epoxy resin interface, and repetitive tensile deformation was applied until delamination. It is found that the number of loading cycles to delamination was increased when the applied tensile stress was lower. It is also found that the 400K curing model showed larger adhesion strength than that of the 300K curing model. This trend is very similar with the results of LaSAT experiments. Our comprehensive study with LaSAT experiments and MD simulations evaluates adhesion strength of Al/epoxy interface and reveals its fracture mechanism.

Study on the effect of temperature and strain rate on Ni2FeCrCuAl high entropy alloy: a molecular dynamics study

2021 ◽  
Vol 3 (4) ◽  
pp. 045042
Author(s):  
S Gowthaman ◽  
T Jagadeesha
Keyword(s):  
Molecular Dynamics ◽  
Strain Rate ◽  
Point Defects ◽  
Tensile Deformation ◽  
Variable Temperature ◽  
Effect Of Temperature ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Beneficial Impact ◽  
The Impact

Abstract High entropy alloy has offered significant attention in various material science applications, due to its excellent material features. In this investigation, the mechanical characteristics of Ni2FeCrCuAl High Entropy Alloy (HEA) have been examined under variable temperature and strain rates to analyze its influence over the material features of high entropy alloy through Molecular Dynamics (MD) simulation and it is stated that the formation of various point defects and dislocations are the major cause for the augmentation of tensile deformation which impacts the tensile behavior of high entropy alloy. Moreover, the Radial Distribution Function (RDF) has been examined throughout tensile deformation, to investigate the impact of applied stress over the de-bonding of various atoms and it is found that the strain rate has a greater beneficial impact over the material feature trailed by the temperature outcome, owed to its superior impact on the formation of point defects and shear strain during tensile characterization.

Microstructure and Texture Evolution of 2024 Aluminum Alloy Sheet under Different Loading Conditions

2018 ◽  
Vol 920 ◽  
pp. 236-243
Author(s):  
Peng Zhou ◽  
Lei Deng ◽  
Xin Yun Wang
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Tensile Deformation ◽  
Texture Evolution ◽  
Deformation Texture ◽  
Alloy Sheet ◽  
Loading Conditions ◽  
Aluminum Alloy Sheet ◽  
2024 Aluminum Alloy ◽  
Goss Texture

To study microstructure and texture evolution of 2024 aluminum alloy sheet under different loading conditions, thermal tensile and compression experiments of 2024 aluminum alloy rolled sheets were carried out at temperatures ranging from 300 °C to 450 °C and under strain rates ranging from 0.001 s-1 to 0.1 s-1. During tensile deformation, the HABs of original grains are directly elongated until abruption. DRX process occurs during compression. Dislocations appear during deformation, migrate and accumulate into LABs, and then rotate into HABs to form new grain.The three-dimensional orientation distribution functions (ODFs) in different stress states were measured, with related texture types and distribution laws compared. According to ODFs with a constant φ2, the deformation texture of {011} <100>Goss texture is gradually strengthened during thermal tension at high temperature and low strain rate (450°C/0.001s-1). The deformation texture of {011} <100>Goss texture is weakened with the strain increasing. Furthermore, the increase of deformation temperature or the decrease of strain rate slows down the weakening process of {011} <100> Goss texture, which is attributed to the recrystallization behavior during tensile deformation. Besides, since the recrystallization process proceeds more completely during hot compression, it produces a quasi-random texture.

scholarly journals The Effect of Temperature and Strain Rate on the Interfacial Behavior of Glass Fiber Reinforced Polypropylene Composites: A Molecular Dynamics Study

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1766 ◽  
Author(s):  
Muhan Zhang ◽  
Bingyan Jiang ◽  
Chao Chen ◽  
Dietmar Drummer ◽  
Zhanyu Zhai
Keyword(s):  
Molecular Dynamics ◽  
Strain Rate ◽  
Glass Fiber ◽  
Tensile Deformation ◽  
Interfacial Strength ◽  
Dynamics Simulation ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
Interfacial Behavior ◽  
Glass Fiber Reinforced

To make better use of fiber reinforced polymer composites in automotive applications, a clearer knowledge of its interfacial properties under dynamic and thermal loadings is necessary. In the present study, the interfacial behavior of glass fiber reinforced polypropylene (PP) composites under different loading temperatures and strain rates were investigated via molecular dynamics simulation. The simulation results reveal that PP molecules move easily to fit tensile deformation at higher temperatures, resulting in a lower interfacial strength of glass fiber–PP interface. The interfacial strength is enhanced with increasing strain rate because the atoms do not have enough time to relax at higher strain rates. In addition, the non-bonded interaction energy plays a crucial role during the tensile deformation of composites. The damage evolution of glass fiber–PP interface follows Weibull’s distribution. At elevated temperatures, tensile loading is more likely to cause cohesive failure because the mechanical property of PP is lower than that of the glass fiber–PP interface. However, at higher strain rates, the primary failure mode is interfacial failure because the strain rate dependency of PP is more pronounced than that of the glass fiber–PP interface. The relationship between the failure modes and loading conditions obtained by molecular dynamics simulation is consistent with the author’s previous experimental studies.

NANOSCALE VOID GROWTH IN MAGNESIUM: A MOLECULAR DYNAMICS STUDY

2010 ◽  
Vol 02 (01) ◽  
pp. 191-205 ◽  
Author(s):  
SEBASTIEN GROH ◽  
ESTEBAN B. MARIN ◽  
M. F. HORSTEMEYER
Keyword(s):  
Molecular Dynamics ◽  
Strain Rate ◽  
Void Growth ◽  
Damage Evolution ◽  
Tensile Deformation ◽  
The Other ◽  
Prismatic Slip ◽  
Molecular Dynamics Calculations ◽  
Slip Planes ◽  
Crystallographic Orientations

Molecular dynamics calculations were carried out in single crystal magnesium specimens to reveal the dependence of strain rate, temperature, and orientation of the crystal on damage evolution as defined by pore growth. Two specific crystallographic orientations [0001] and [Formula: see text] were examined. During a [0001] tensile test, twin boundaries developed at the void surface leading to a constraint on the [Formula: see text] crystallographic orientation. On the other hand, during the [Formula: see text] tensile deformation, emission of shear loops in the prismatic slip planes arose when void growth initiated. Furthermore, analysis of the damage components (nucleation, growth and coalescence) revealed that a large number of small voids nucleated that rapidly grew and fractured the specimens independent of the temperature and the strain rate.

Characteristics of Interfacial Strength of Aluminum Alloy and Epoxy Resin Subjected to Cyclic Loading

2020 ◽  
Vol 2020 (0) ◽  
pp. 17A06
Author(s):  
Kohei KANAMORI ◽  
Yoshikatsu KIMOTO ◽  
Yusaku SAITO ◽  
Akio YONEZU
Keyword(s):  
Aluminum Alloy ◽  
Cyclic Loading ◽  
Epoxy Resin ◽  
Interfacial Strength
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