Experimental determination of impact tensile properties of adhesive butt joints with the split Hopkinson bar

2003 ◽  
Vol 38 (3) ◽  
pp. 233-245 ◽  
Author(s):  
T Yokoyama
Keyword(s):  
Tensile Strength ◽  
Layer Thickness ◽  
Energy Absorption ◽  
Loading Rate ◽  
Adhesive Layer ◽  
Hopkinson Bar ◽  
Butt Joints ◽  
Cyanoacrylate Adhesive ◽  
Split Hopkinson ◽  
The Impact

The tensile strength and energy absorption of adhesive butt joints at high rates of loading are determined with a tensile split Hopkinson bar using a cylindrical specimen. A commercially available single-component cyanoacrylate adhesive (instantaneous adhesive) and two different adherend materials are used in the adhesion tests. The impact tensile strength of the cyanoacrylate adhesive butt joints is determined from the applied tensile stress history at failure initiation. The impact absorbed energy is obtained by numerical integration of dynamic tensile load-adhesive deformation data. Comparative tension tests at low and intermediate rates of loading are performed on an Instron testing machine. An axisymmetric finite element analysis is carried out to investigate the stress distributions in the adhesive layer of the cyanoacrylate adhesive butt joints. The effects of loading rate, adherend material and adhesive layer thickness on the tensile strength and energy absorption of the cyanoacrylate adhesive butt joints are examined in detail. It is shown that the joint tensile strength increases significantly with increasing loading rate and is greatly affected by both the adhesive layer thickness and the adherend materials. The limitations of the technique are discussed.

EFFECT OF PRE-FATIGUE ON DYNAMIC AND STATIC TENSILE PROPERTIES OF LASER WELDED BUTT JOINTS BETWEEN DIFFERENT HIGH STRENGTH STEEL PLATES

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1141-1146 ◽  
Author(s):  
H. KOBAYASHI ◽  
M. DAIMARUYA ◽  
H. TSUDA ◽  
K. HORIKAWA ◽  
Y. YAMADA
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Heat Affected Zone ◽  
High Strength ◽  
Hopkinson Bar ◽  
Steel Plates ◽  
Butt Joints ◽  
Metal Parts ◽  
Static Tensile ◽  
Split Hopkinson

In this research, the effects of pre-fatigue on the dynamic and quasi-static tensile properties of laser welded butt joints between three kinds of steel plates, i.e. HR270, HR590 and HR780 steels, were investigated using tensile split Hopkinson bar apparatus. There were no significant effects of pre-fatigue on the dynamic and static tensile properties of HR780-HR270 and HR780-HR590 joints. Their fracture occurred in the middle of the weaker base metal parts. However, one or two in three pre-fatigued HR780-HR780 joint specimens broke at the heat affected zone, irrespective of strain rate. Their elongation decreased dramatically from that of the virgin specimens, although there are no changes in the tensile strength.

Effect of Adhesive Thickness on the Impact Toughness of Butt-Joints

2011 ◽  
Vol 230-232 ◽  
pp. 1350-1354 ◽  
Author(s):  
Min You ◽  
Jing Rong Hu ◽  
Xiao Ling Zheng ◽  
Ai Ping He ◽  
Cun Jun Chen
Keyword(s):  
Impact Toughness ◽  
Adhesive Layer ◽  
Curing Temperature ◽  
Curing Time ◽  
Optimum Thickness ◽  
Adhesively Bonded ◽  
Butt Joints ◽  
Notched Specimen ◽  
Adhesive Thickness ◽  
The Impact

The effect of the adhesive thickness on the impact toughness of the adhesively bonded steel joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness increases when the adhesive thickness increased then it decrease as the adhesive thickness increase. When the curing time is set as a constant, the higher the curing temperature is, the lower the impact toughness of the joint. The optimum thickness of the adhesive layer for the specimen of impact toughness test cured at 60 C for 1 h is 0.6 mm and it is 0.4 mm to 0.6 mm for the specimen cured 1 h at temperature of 90 C or higher than it. It is recommended using the notched specimen to decrease the testing deviation.

On the Impact Tensile Behavior of Nylon and Aramid Silks for Parachute

2013 ◽  
Vol 821-822 ◽  
pp. 1365-1371
Author(s):  
Bing Hou ◽  
Xuan Chen ◽  
Lei Zhao ◽  
Yu Long Li
Keyword(s):  
Fracture Mode ◽  
Loading Rate ◽  
Tensile Behavior ◽  
Rate Effect ◽  
Shear Direction ◽  
Split Hopkinson ◽  
The Impact

The impact tensile behaviors of four parachute cloths have been studied experimentally by using Split Hopkinson Tensile Bars (SHTB). The force/strain curves at different loading velocities as well as the fracture mode are obtained for each material. Obvious loading rate effect was observed for both the strengths and the failure strains. The three Nylon silks are fractured mostly at the root of specimen/clamps connections and the Aramid silk is inclined to fracture in the middle of the specimen and in the shear direction.

The split Hopkinson bar, a versatile tool for the impact testing of concrete

1986 ◽  
Vol 19 (1) ◽  
pp. 55-63 ◽  
Author(s):  
H. W. Reinhardt ◽  
H. A. Körmeling ◽  
A. J. Zielinski
Keyword(s):  
Hopkinson Bar ◽  
Impact Testing ◽  
Split Hopkinson Bar ◽  
Versatile Tool ◽  
Split Hopkinson ◽  
The Impact

scholarly journals Analysis on the impact response of fiber-reinforced composite laminates: an emphasis on the FEM simulation

2019 ◽  
Vol 26 (1) ◽  
pp. 1-11
Author(s):  
Jian He ◽  
Liang He ◽  
Bin Yang
Keyword(s):  
Energy Absorption ◽  
Impact Energy ◽  
Composite Laminates ◽  
Mechanical Response ◽  
Adhesive Layer ◽  
Laminated Plates ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Damage Area ◽  
The Impact

AbstractThe effects of units, material parameters, and constitutive relationships on the dynamic mechanical response of composite laminates subjected to high- and low-velocity impacts were investigated. Additionally, the role of impact or shape, including hemispherical, flat, and conical, on the damage area of the adhesive layer and displacement of the center of the laminated plates was investigated. The results show that the energy absorption of composite laminates increases with impact velocity, and specific energy absorption changes with the density of the contact surface, which is affected by ply thickness. Moreover, the target energy absorption decreases with increasing layer angle. Under a low-velocity impact, the maximum contact force, damage area of the adhesive layer, and displacement of the center of the laminated plate increase as the impact energy increases, thus showing that impact energy is not directly related to contact duration and energy absorption of composite laminates. The results of different geometric shapes show that the damage area of the adhesive layer and the displacement of the center of the laminated plates are largest for a conical impactor and smallest for a flat impactor.

The effect of particle size on microstructure, relative density and indentation load of Mg-B4C composites fabricated at different loading rates

2019 ◽  
Vol 54 (17) ◽  
pp. 2297-2311 ◽  
Author(s):  
K Rahmani ◽  
GH Majzoobi
Keyword(s):  
Particle Size ◽  
Relative Density ◽  
Loading Rate ◽  
Hopkinson Bar ◽  
Maximum Load ◽  
Indentation Load ◽  
High Rate ◽  
Split Hopkinson Bar ◽  
Indentation Tests ◽  
Split Hopkinson

The effect of reinforcing particle size on microstructure, relative density and indentation of Mg reinforced by 0, 1.5, 3, 5 and 10% volume fractions of nano- and micro-sized B4C was investigated. The composites were fabricated through powder compaction technique at strain rates of 1.6 × 103 s−1, 8 × 102 s−1 and 8×103 s−1 using split Hopkinson bar, drop hammer and Instron, respectively. The results indicated that the size of B4C and loading rate had significant effect on relative density. For example, the relative density of Mg-10 vol.% B4C nanocomposite was around 2.5% higher than that of its corresponding microcomposites. The relative density of the samples produced at high rate of loading was in average 1.2% higher than that of the samples fabricated quasi-statically. The results of indentation tests on the produced nanocomposite and microcomposite samples also revealed that loading rate and B4C particle size had significant effect on strength of specimens. For example, for Mg-5 vol.% B4C, the maximum load in load–depth curve of the specimens produced by split Hopkinson bar increased from 530 N for micron-sized B4C to 780 N for nano-sized B4C, around 45% improvement. Moreover, nanocomposites had better indentation resistance compared to similar micro composites fabricated using the three methods.

Rotational wood welding of Dalbergia sissoo wood: forming longitudinal tongue-and-groove and butt joints

2021 ◽  
Vol 347 ◽  
pp. 5-11
Author(s):  
Shailendra KUMAR ◽  
Shikhar SHUKLA ◽  
Krishna KANT SHUKLA
Keyword(s):  
Tensile Strength ◽  
Joint Strength ◽  
Weld Line ◽  
Dalbergia Sissoo ◽  
Butt Joints ◽  
Welding Machine ◽  
Welding Technology ◽  
Product Manufacture ◽  
The Impact

Wood joinery is an essential part of woodworking for product manufacture. Wood sections are mostly joined together with adhesives. Wood welding brings a new dimension to joinery by using mechanical friction to induce a flow of wood components ensuring adhesion. In this study, a customized spin wood-welding machine was used to join wood sections of Dalbergia sissoo. Butt and tongue-and-groove joints were prepared and welded using the machine. The tensile strength of the joints was tested. The impact on joint strength of increasing the friction area by introducing tongue-and-groove joints was tested and analyzed. The tensile strength for butt joints at 1,200 rpm welding was estimated at 5.3 MPa. Joint strength was found to increase substantially (by 66%) with a tongue-and-groove welding section. Weld line temperatures at different spin times were also investigated. The aim of this study is to apply welding technology to Dalbergia sissoo to achieve greater joint strength.

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