scholarly journals Effect of Full Temperature Field Environment on Bonding Strength of Aluminum Alloy

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 657
Author(s):  
Haichao Liu ◽  
Yisa Fan ◽  
Han Peng
Keyword(s):  
Aluminum Alloy ◽  
Temperature Field ◽  
Young’S Modulus ◽  
Bonding Strength ◽  
Young's Modulus ◽  
Failure Criteria ◽  
Failure Strength ◽  
Bonded Joints ◽  
Different Temperatures ◽  
Full Temperature

In this paper, the influence of temperature on the bonding strength of aluminum alloy joints under the full temperature field is studied. Based on the service temperature range of vehicle bonding structures, the failure strength of aluminum alloy joints at different temperature points, namely −40 °C, −20 °C, 0 °C, 25 °C (RT), 40 °C, 60 °C and 80 °C, is tested. The results showed that compared with the failure strength of the adhesive at −40 °C, it decreased by 47.69% and 68.15% at RT and 80°C, respectively; the Young’s modulus of the adhesive decreased by 57.63% and 75.42% at RT and 80°C, respectively; with the increase of temperature, the young’s modulus, tensile strength and failure strain of the adhesive decreased. In addition, the failure strength of aluminum alloy joints varied with temperature. To be specific, the stiffness of joints decreased gradually from 25 °C to 80 °C and increased gradually from −40 °C. Based on the failure strength data of bonded joints at different temperature points, the secondary stress failure criteria of bonded joints at different temperatures were obtained. Then, the surface function of failure criteria under the full temperature field was established to provide reference for failure prediction of bonded structures under different temperatures and stresses.

scholarly journals Adhesive Joint Stiffness in the Aspect of FEM Modelling

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3911 ◽  
Author(s):  
Anasiewicz ◽  
Kuczmaszewski
Keyword(s):  
Aluminum Alloy ◽  
Numerical Model ◽  
Young’S Modulus ◽  
Adhesive Joint ◽  
Structural Changes ◽  
Young's Modulus ◽  
Joint Stiffness ◽  
Experimental Tests ◽  
Boundary Zone ◽  
Adhesive Properties

The paper presents the results of nanoindentation testing, carried out along the thickness of the adhesive joint joining sheets of aluminum alloy. The purpose of the tests was to determine changes in the Young’s modulus in the joint resulting from the active impact of the joined aluminum alloy sheets on the adhesive during curing of the adhesive bond. Structural changes that take place during curing of the joint, especially in the boundary zone, can have a significant impact on the adhesive properties and consequently, on the adhesive joint strength. The Young’s modulus of the adhesive (Ek) in the joint assumes variable values as the distance from the connections changes. This phenomenon is called the apparent Young’s modulus. The problem is to define the size of the boundary zone in which the value of Ek significantly differs from the value in the so-called core. Based on the obtained results of experimental tests, a numerical model was built taking into account the observed differences in the properties of the joint material. The stress distribution in the adhesive joint, single-lap connection with the three-zone adhesive joint, was analyzed in comparison to the classical numerical model in which adhesive in the adhesive joint is treated as isotropic in terms of rigidity.

scholarly journals Theoretical Investigation on Failure Strength and Fracture Toughness of Precracked Single-Layer Graphene Sheets

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Xin-Liang Li ◽  
Jian-Gang Guo
Keyword(s):  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Young’S Modulus ◽  
Failure Strain ◽  
Young's Modulus ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Failure Strength ◽  
Griffith Criterion ◽  
Variation Trends

Young’s modulus, failure strength, and failure strain of precracked graphene are investigated via finite element method based on molecular structure mechanics in this research. The influence of distribution, length, and orientation of precrack and graphene sizes on these mechanical properties is analyzed. The ratio of precrack length and graphene width is defined as P value, and its particular value Pc can be found, at which the variation trends of Young’s modulus, failure strength, and strain have changes with increasing P value. In addition, the fracture toughness of precracked graphene is investigated, and the stress intensity factor (SIF) is calculated according to the Griffith criterion in classical fracture mechanics. The numerical values of the SIF are about 3.20-3.37 MPa√m, which are compared with the experimental results, and the simulations verify the applicability of the classical fracture mechanics to graphene.

Dynamic Effective Young's Modulus of Thin Adhesive Layers in Bonded Joints

1982 ◽  
Vol 10 (5) ◽  
pp. 192 ◽  
Author(s):  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
N Ramakrishnan ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Bonded Joints ◽  
Adhesive Layers

In Situ Measurement of the Young’s Modulus of an Embedded Inclusion by Acoustic Microscopy

1997 ◽  
Vol 119 (2) ◽  
pp. 143-147 ◽  
Author(s):  
S. Canumalla ◽  
G. A. Gordon ◽  
R. N. Pangborn
Keyword(s):  
Aluminum Alloy ◽  
Rayleigh Wave ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Target Material ◽  
Acoustic Microscopy ◽  
Alloy Matrix ◽  
Cross Sectional ◽  
Rayleigh Wave Speed

Alumina-silicate inclusions (shot) have been found to adversely affect the mechanical properties of a short alumina-silicate fiber reinforced aluminum alloy (A356). To better understand the differences between the responses of the shot and fibers to applied loads, the Young’s modulus of the shot is measured and compared to that of the fibers. The Rayleigh wave speed in the shot particle (cross-sectional area of 200 μm × 150 μm), measured in situ to be 4041 m/s using a scanning acoustic microscope, was used to calculate the Young’s modulus of the shot particle (132 GPa). The accuracy of the technique and the experimental arrangement used was verified to be better than four percent by independent measurements of the Rayleigh wave speeds in the aluminum alloy matrix and an embedded sapphire fiber. The fiber modulus was estimated to be 225 GPa based on a comparison of previously measured composite modulus with micromechanical predictions. Thus, shot was found to have a Young’s modulus 40 percent lower than that of the fibers. The applicability of the V(z) technique has been demonstrated for measuring the elastic properties over a microscopic area, even when the target material is an embedded inclusion.

scholarly journals Influence of Material on Wheelchair Vibrations

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 127
Author(s):  
Takeshi Waga ◽  
Soichiro Ura ◽  
Masahito Nagamori ◽  
Hisashi Uchiyama ◽  
Akira Shionoya
Keyword(s):  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Young’S Modulus ◽  
Vibration Frequency ◽  
Weight Reduction ◽  
Young's Modulus ◽  
Specific Weight ◽  
Wheelchair Sports ◽  
The Difference

Wheelchair sports have a tendency to depend on the performance of wheelchairs, and the weight reduction of wheelchairs made of various alloys has helped improve the performance of players. Some players have mentioned, however, that the operability and riding comfort of competition wheelchair have been affected by changing the wheelchair materials; stiffness and weight are considered to be related to operability and riding comfort. In this experiment, we installed some weights on the center of the mass of a competitive wheelchair made of magnesium alloy to be the same mass of a wheelchair made of aluminum alloy; vibrations that occurred on both wheelchairs while driving were measured and compared. The experiment was performed using 3-axis sensors. This experiment showed that the vibration frequency of the wheelchair made of magnesium alloy was different from that made of aluminum alloy. This result was thought to be influenced by the difference in Young’s modulus or the specific weight.

Microstructure and Tribological Properties of Cathodic Arc Ion Plated TiAlN and TiSiN Coatings at High Temperatures

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Kong Weicheng ◽  
Shen Hui ◽  
Kong Dejun
Keyword(s):  
Surface Roughness ◽  
Young’S Modulus ◽  
High Temperatures ◽  
Wear Mechanism ◽  
Bonding Strength ◽  
Young's Modulus ◽  
Average Particle ◽  
Tialn Coating ◽  
X Ray ◽  
Cathodic Arc

TiAlN and TiSiN coatings were deposited on YT15 cemented carbide using a cathodic arc ion plating (CAIP). The surface-cross section morphologies, chemical elements, surface roughness, phases, and chemical valences of as-obtained coatings were analyzed using a scanning electron microscopy (SEM), energy dispersive spectroscopy, atomic force microscopy (AFM), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS), respectively, and the bonding strength, hardness and Young's modulus of TiAlN and TiSiN coatings were measured using a scratch tester and nano-indentation, respectively, and the wear mechanism at high temperatures was also discussed. The results show that the surface roughness of TiAlN and TiSiN coatings is 69.1 and 58.0 nm, respectively, and the corresponding average particle size is 998.8 and 817.2 nm, respectively. The TiAlN coating is composed of TiAlN and AlN, while the TiSiN coating is composed of TiN and Si3N4. The bonding strength of TiAlN and TiSiN coatings is 84.3 and 72.6 N, respectively, the hardness and Young's modulus of TiAlN coating is 23.67 and 415.80 GPa, respectively, while that of TiSiN coating is 20.46 and 350.40 GPa, respectively. The average coefficients of friction (COFs) of TiAlN and TiSiN coatings are 0.4516 and 0.4807, respectively; the corresponding wear rate is 589.7 × 10−6 and 4142.2 × 10−6 mm3 N−1 s−1, respectively; the wear mechanism of TiAlN and TiSiN coatings is oxidation wear and abrasive wear.

Mechanical Properties of Interpenetrating Graphite/2024Al Composites Produced by Improved Squeeze Exhaust Casting

2007 ◽  
Vol 353-358 ◽  
pp. 1471-1474 ◽  
Author(s):  
Chen Su ◽  
Gao Hui Wu ◽  
Jing Qiao ◽  
Long Tao Jiang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Flexural Strength ◽  
Young’S Modulus ◽  
Fracture Mechanism ◽  
Room Temperature ◽  
Squeeze Casting ◽  
Young's Modulus ◽  
Fracture Surfaces ◽  
3D Network

The graphite/2024Al composites have been fabricated by improved Squeeze Exhaust Casting (SQEC) method. Two kinds of graphite preforms with porosities of 13% and 17% respectively were infiltrated with 2024Al (Al-5Cu-2Mg) alloy under the pressure of 73MPa. The disadvantages of traditional Squeeze Casting (SQC) were avoided and the distribution of aluminum alloy appeared homogenous 3D network in the composites. Flexural strength and Young’s modulus were determined at room temperature. Compared to graphite preform, the composites exhibited a significant enhancement of mechanical properties. The flexural strength and Young’s modulus of X-Y direction of G186/2024Al composites increased from 38.6MPa to 99.7MPa and from 10.1GPa to 19.7GPa, respectively. The fracture mechanism of the composites was discussed on the basis of fracture surfaces.

Identification of the Young's modulus of PTFE at different temperatures via Digital Image Correlation

2019 ◽  
Author(s):  
Matheus Freire Garcia ◽  
Caiuã Melo, C. C. ◽  
Vinicius Sciuti ◽  
Gabriel Guenoun ◽  
Nikolaus SCHMITT ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Young’S Modulus ◽  
Digital Image ◽  
Young's Modulus ◽  
Image Correlation ◽  
Different Temperatures

Improving Precision in Aluminum Alloy Machining Due to the Application of Diamond-Like Carbon Thin Film

2020 ◽  
Vol 143 (7) ◽  
Author(s):  
William de Melo Silva ◽  
Paulo Sérgio Martins ◽  
Vagner Eustáquio de Carvalho ◽  
Nilson Cristino da Cruz ◽  
Enzo Claudino ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Tungsten Carbide ◽  
Young’S Modulus ◽  
Photoelectron Spectroscopy ◽  
Young's Modulus ◽  
Cutting Speed ◽  
Film Surface ◽  
Diamond Like Carbon ◽  
Drilling Operations ◽  
Raman Backscatter

Abstract Cutting precision is extremely affected by a phenomenon known as built up edge (BUE) that occurs on tungsten carbide tools during low cutting speed of aluminum alloy. BUE is responsible for early tool breakage due to excessive material build up from the machined part on the cutting face, leading to problems of shape irregularity and tool-tip breakage. Thus, diamond-like carbon (DLC) was deposited and tested to verify cutting precision in aluminum alloy by using tungsten carbide tools. The characterizations of the film were morphology analysis through scanning electron microscopy (SEM), structural atomic analyze of chemical bond from Raman backscatter spectroscopy, the distribution of carbon atoms on the film surface by X-ray photoelectron spectroscopy (XPS), and the evaluation of Young’s modulus and hardness using the Oliver–Pharr method. To analyze the cutting precision, drilling tests were performed on coated/uncoated drills at two cutting speeds (340 and 430 m/min). As an evaluation parameter in the aluminum alloy, the hole diameter deviation was measured after pre determined numbers of drilling operations. Statistical comparisons between the diameter deviation as a function of the number of drilling test indicated better cutting accuracy for the DLC-coated tool. The factors identified in this work, such as the reduction of the friction coefficient, and the hardness and Young’s modulus of the DLC helped in the performance of the tool, mainly in the lower cutting speed.

An improved energy method for determining Young’s modulus by instrumented indentation using a Berkovich tip

2008 ◽  
Vol 23 (8) ◽  
pp. 2106-2115 ◽  
Author(s):  
Dejun Ma ◽  
Chung Wo Ong ◽  
Taihua Zhang
Keyword(s):  
Aluminum Alloy ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Total Work ◽  
Instrumented Indentation ◽  
Modulus Ratio ◽  
6061 Aluminum Alloy ◽  
Functional Relationships ◽  
Two Parameters ◽  
Special Case

We previously proposed a method for estimating Young’s modulus from instrumented nanoindentation data based on a model assuming that the indenter had a spherical-capped Berkovich geometry to take account of the bluntness effect. The method is now further improved by releasing the constraint on the tip shape, allowing it to have a much broader arbitrariness to range from a conical-tipped shape to a flat-ended shape, whereas the spherical-capped shape is just a special case in between. This method requires two parameters to specify a tip geometry, namely, a volume bluntness ratio Vr and a height bluntness ratio hr. A set of functional relationships correlating nominal hardness/reduced elastic modulus ratio (Hn/Er) and elastic work/total work ratio (We/W) were established based on dimensional analysis and finite element simulations, with each relationship specified by a set of Vr and hr. Young’s modulus of an indented material can be estimated from these relationships. The method was shown to be valid when applied to S45C carbon steel and 6061 aluminum alloy.

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