scholarly journals Flow-Based Anatomy of Bobbin Friction-Stirred Weld; AA6082-T6 Aluminium Plate and Analogue Plasticine Model

2020 ◽  
Vol 1 (1) ◽  
pp. 3-19
Author(s):  
Abbas Tamadon ◽  
Dirk J. Pons ◽  
Don Clucas
Keyword(s):  
Cross Section ◽  
Material Flow ◽  
Weld Seam ◽  
Flow Mechanism ◽  
Analogue Model ◽  
Friction Stir ◽  
Weld Structure ◽  
History Of ◽  
Critical Characteristics ◽  
The Cross

Material flow transportation around the rotating tool and the mass deposition at the backside of the tool are critical characteristics of friction stir welding. To achieve an optimized weld structure, the history of the plastic deformation needs to be identified with a flow-based elucidation. In this study, an analogue model was applied to evaluate the formation of a banded structure using the bobbin tool, with a focus on the interaction between the tool-workpiece. The flow visualization in plasticine analogue was validated in comparison with the aluminium welds. The plastic flow mechanism was visualized both, at the surface and the cross-section of the weld-seam. The cross-section of the weld shows the details of the formation of tunnel voids, caused by the failure of the flow regimes. A physical model of the material flow was proposed to explain the formation mechanism of the tunnel void as a discontinuity during the mass refilling at the rear of the tool.

scholarly journals The History of the Cross Section of Stock Returns

2016 ◽  
Author(s):  
Juhani T. Linnainmaa ◽  
Michael R. Roberts
Keyword(s):  
Stock Returns ◽  
Cross Section ◽  
History Of ◽  
The Cross

PROPERTIES AND GEOMORPHIC RELATIONSHIPS OF SOILS DEVELOPED ON A QUARTZITE RIDGE NEAR KINGSTON, ONTARIO

1970 ◽  
Vol 50 (3) ◽  
pp. 419-429 ◽  
Author(s):  
G. K. RUTHERFORD ◽  
D. K. SULLIVAN
Keyword(s):  
Cross Section ◽  
Soil Surface ◽  
Soil Characteristics ◽  
Soil Profiles ◽  
Soil Genesis ◽  
Parent Materials ◽  
Tropical Environments ◽  
History Of ◽  
The Cross ◽  
Lateral Variations

The work of Ruhe, Butler, Churchward and others in temperate and tropical environments has shown that soil profiles are intimately associated in age with their soil surfaces. A sequence of soils forming a soil surface across a Precambrian ridge near Kingston, Ontario was investigated to consider soil characteristics, soil genesis and stratigraphic relationships. Lateral variations in the parent materials along the cross-section indicate the presence of depositional layers of different relative ages and constitution. The stratigraphic as well as the pedological relationships of these deposits were investigated to determine a depositional stratigraphic history of the ridge.

scholarly journals The History of the Cross Section of Stock Returns

2016 ◽  
Author(s):  
Juhani Linnainmaa ◽  
Michael Roberts
Keyword(s):  
Stock Returns ◽  
Cross Section ◽  
History Of ◽  
The Cross

scholarly journals The History of the Cross-Section of Stock Returns

2018 ◽  
Vol 31 (7) ◽  
pp. 2606-2649 ◽  
Author(s):  
Juhani T Linnainmaa ◽  
Michael R Roberts
Keyword(s):  
Stock Returns ◽  
Cross Section ◽  
History Of ◽  
The Cross

The North Benton Mound: A Hopewell Site in Ohio

1945 ◽  
Vol 11 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Willis H. Magrath
Keyword(s):  
Cross Section ◽  
Recent History ◽  
The South ◽  
The North ◽  
Great Size ◽  
History Of ◽  
Original Owner ◽  
The Cross ◽  
The Village

The North Benton Mound is a Hopewell site located in Mahoning County, northeastern Ohio. This mound is on the farm of Mr. John Malmsberry, near the village of North Benton. Mr. Roy Saltsman and the writer participated in the excavation of the site. The photographs and other records were made by the writer.The recent history of the mound is interesting. The grave of Judge William Smith, original owner of the mound, was placed some seven or eight feet north of the crest. It is shown in the cross section (Fig. 4). When Smith died in 1837 with the strange request that he be buried in the mound, the top was apparently cut off to make a burial platform; the removed dirt which was thrown down upon the south shoulder is represented on the projected cross section by broken hatching. The mound, situated on a high knoll, later became an even more conspicuous landmark when conifers were planted on it and grew to great size.

Texture Heterogeneity in ECAP Deformed Copper

2010 ◽  
Vol 160 ◽  
pp. 47-54 ◽  
Author(s):  
Werner Skrotzki ◽  
Christine Tränkner ◽  
Robert Chulist ◽  
Benoît Beausir ◽  
Satyam Suwas ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Equal Channel Angular Pressing ◽  
Cross Section ◽  
Material Flow ◽  
Room Temperature ◽  
High Energy ◽  
Polycrystalline Copper ◽  
Angular Pressing ◽  
The Cross

Polycrystalline copper of 4N purity has been deformed by equal channel angular pressing at room temperature using route BC. Local textures have been measured by high-energy synchrotron radiation along 3 lines in the cross section from the top to the bottom of the billets. The texture heterogeneity observed in the cross section is presented for 2 passes and discussed with regard to friction-affected material flow.

EFFECT OF FRICTION STIR PROCESSING CONDITION ON TENSILE PROPERTIES OF Al-7Si-0.3Mg CAST ALLOY

2012 ◽  
Vol 06 ◽  
pp. 397-400
Author(s):  
Z.W. Chen
Keyword(s):  
Tensile Properties ◽  
Friction Stir Processing ◽  
Material Flow ◽  
Rotation Speed ◽  
Cast Alloy ◽  
Processing Condition ◽  
Flow Mechanism ◽  
Friction Stir ◽  
High Elongation ◽  
High Rotation Speed

Multipass friction stir processing (FSP) of cast Al -7 Si -0.3 Mg alloy was conducted and FS microstructures were related to the fracture paths and tensile properties. It has been found that high rotation speed (ω) FS caused alignments of Si particles, providing easy paths for fracturing during loading and resulting in low elongation and lower UTS values of the processed alloy. The material flow mechanism during FS leading to the alignments is suggested. This suggested mechanism has been verified after conducting FS experiments using a lower ω value which eliminated Si particle alignments and thus allowed high elongation and UTS values to be attained.

Out-of-Plane Impact at the Tip of a Right-Angled Bent Cantilever Beam

1995 ◽  
Vol 62 (4) ◽  
pp. 887-892 ◽  
Author(s):  
B. Wang ◽  
T. X. Yu ◽  
S. R. Reid
Keyword(s):  
Cantilever Beam ◽  
Cross Section ◽  
Bending Moment ◽  
Pure Bending ◽  
Concentrated Mass ◽  
Impulsive Load ◽  
Out Of Plane ◽  
History Of ◽  
The Cross

The present paper provides an analysis of the response of a right-angled bent cantilever beam subjected to an out-of-plane impulsive load (i.e., suddenly imposed velocity) applied to concentrated mass at its tip. If T0 and M0 are the fully plastic torque and bending moment, respectively, of the cross section, it is shown that for the case T0/M0 < 1, a double hinge mechanism is required, with a pure bending hinge in the first segment of the beam and a combined bending-torsion hinge in the second segment. The history of deformation is described following impartation of the load.

scholarly journals Effect of Tool Rotational Speed on the Microstructure and Mechanical Properties of Bobbin Tool Friction Stir Welded 6082-T6 Aluminum Alloy

Metals ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 894 ◽  
Author(s):  
Yupeng Li ◽  
Daqian Sun ◽  
Wenbiao Gong
Keyword(s):  
Aluminum Alloy ◽  
Cross Section ◽  
Heat Affected Zone ◽  
Rotational Speed ◽  
Maximum Temperature ◽  
Friction Stir ◽  
Fracture Location ◽  
Microhardness Distribution ◽  
Average Grain Size ◽  
The Cross

Samples of 6082-T6 aluminum alloy were welded by bobbin tool friction stir welding at different rotational speeds. The thermal cycles, microstructure, microhardness, and tensile properties of the specimens were investigated. The results show that the maximum temperature at the joint increases first and then decreases with increasing rotational speed, and the maximum temperature is 509 °C at 1000 r/min. The macromorphology of the cross-section of the joint is rectangular, and an ‘’S” line and gray-white texture can be observed. The stirred zone had much smaller equiaxed recrystallized grains. With increasing welding speed, the average grain size in the stirred zone region decreases. The microhardness distribution of the cross-section of all joints is W-shaped. When the rotational speed increases, the hardness of the heat-affected zone decreases gradually, and the hardness of the stirred zone increases. At 600 r/min, the strength is the lowest. The fracture location is between the stirred zone and the thermomechanically affected zone. When the rotational speed is increased, the fracture location is entirely located in the heat affected zone, and the fracture surface is dimple-like; the strength significantly increases and reaches a maximum at 800 r/min.

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