Cyclic deformation and fracture behavior of Al alloy 6061 under the action of positive mean stresses

1993 ◽  
Vol 24 (9) ◽  
pp. 2083-2093 ◽  
Author(s):  
Zhi’an Yang ◽  
Zhirui Wang
Keyword(s):  
Cyclic Deformation ◽  
Fracture Behavior ◽  
Al Alloy ◽  
Deformation And Fracture ◽  
Alloy 6061 ◽  
Mean Stresses

Tensile Deformation and Fracture Behavior of a Commercial Al Alloy with Nano-Sized Grains

2004 ◽  
Vol 449-452 ◽  
pp. 589-592 ◽  
Author(s):  
Si Young Chang ◽  
Sang Ho Seo ◽  
Seong Hee Lee ◽  
Chang Seog Kang ◽  
Sung Kil Hong ◽  
...  
Keyword(s):  
Fracture Behavior ◽  
Tensile Deformation ◽  
Al Alloy ◽  
Annealed Alloy ◽  
Pressing Temperature ◽  
Nano Structure ◽  
Angular Pressing ◽  
Deformation And Fracture ◽  
Elongation To Failure ◽  
5083 Al Alloy

The nano-structure in the commercial 5083 Al alloy was introduced by the equal channel angular pressing technique. The nano-sized grains of ~300 nm were obtained after 8 ECAPs at 373 K and 473 K. It was also obvious that much improvement in strength was obtained at lower pressing temperature, 373 K, than 473 K. In particular, there were mainly two different tensile characteristics; one was that the strength in the alloy ECA pressed at 373 K was much higher than that of as-annealed alloy but the elongation to failure was significantly smaller, while, in case of pressing at 473 K, the improvement in strength was found without sacrificing much of the elongation. The other was that the work hardening with increasing the amount of deformation was found in the alloy ECA pressed at 473 K. These tensile deformation characteristics were analyzed based on the observations of microstructure by TEM and fracture surface by FE-SEM.

Explosively Driven Expansion and Fragmentation Behavior for Cylinders, Spheres and Rings of 304 Stainless Steel

2010 ◽  
Vol 638-642 ◽  
pp. 1035-1040 ◽  
Author(s):  
Tetsuyuki Hiroe ◽  
Kazuhito Fujiwara ◽  
Hidehiro Hata ◽  
Mitsuru Yamauchi ◽  
Kiyotaka Tsutsumi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Speed ◽  
Fracture Behavior ◽  
Copper Wire ◽  
304 Stainless Steel ◽  
Fragmentation Model ◽  
Fragmentation Behavior ◽  
Deformation And Fracture ◽  
Test Parameters ◽  
Fine Copper

Explosive loading techniques are applied to expand tubular cylinders, spherical shells and rings of 304 stainless steel to fragmentation, and the effects of wall thicknesses, explosive driver diameters and the constant proportionality of the in-plane biaxial stretching rates are investigated on the deformation and fracture behavior of three basic structures experimentally and numerically. In the cylinder tests, the driver is a column of high explosive PETN, inserted coaxially into the bore of a cylinder and initiated by exploding a fine wire bundle at the column axis using a discharge current from a high-voltage capacitor bank. In case of the ring tests, ring specimens are placed onto a single cylinder filled with the PETN as a expansion driver, and for sphere tests, specimens filled with the PETN are also initiated by exploding a fine copper wire line with small length located at the central point. Two types of experiments are conducted for every specimen and test condition. The first type uses high speed cameras to observe the deformation and crack generation of expanding specimens showing the final maximum in-plane stretching rate of above , and the second uses soft capturing system recovering typically most fragments successfully. The fragments are measured and investigated using a fragmentation model. The effects of test parameters on the deformation and fracture behavior for three types of structures are discussed in need of modified fragmentation model for shell structural elements.

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