Transformation of Structure in Carbon Steel Specimen under Loading by Mach Stem, Formed in Preliminary Compressed High Explosive Charge TG-40

2011 ◽  
Vol 673 ◽  
pp. 89-94 ◽  
Author(s):  
Ivan A. Bataev ◽  
Igor A. Balagansky ◽  
Anatoly Bataev ◽  
Kazuyuki Hokamoto
Keyword(s):  
Carbon Steel ◽  
Explosive Charge ◽  
High Explosive ◽  
Steel Specimen ◽  
Explosive Loading ◽  
Metallographic Analysis ◽  
Heterogeneous Structure ◽  
Mach Stem ◽  
Localized Deformation ◽  
Current Loading

A structure of a carbon steel specimen after explosive loading is investigated. The loading was executed by Mach stem, formed in high explosive charge that was preliminary compressed by advanced wave in ceramic bar. In the original condition the specimen had a typical for low carbon steel ferrite-pearlite structure. Metallographic analysis has shown that during the process of the explosive loading the following structural changes took place: formation of numerous deformation twins in both ferrite grains and pearlite colonies (i.e. in two-phase structure); formation of extended bands of localized deformation, which are not crystallographically connected with the original ferrite-pearlite structure; fine grains formation in zones of severe plastic flow. The size of the ferrite grains is by an order of magnitude less than the original grains size. According to the authors’ opinion, above-noted structural peculiarities demonstrate that loading conditions achieved in the current loading scheme differ from common. The phenomenon of non-typical twinning in heterogeneous structure (pearlite) indirectly evidences that extremely high stresses and strain rates took place in the specimen during the loading.

Hole Expansion by Using Al-Alloy Specimen and 0.45% Carbon Steel Specimen

2010 ◽  
Vol 452-453 ◽  
pp. 601-604
Author(s):  
Muhammed Sohel Rana ◽  
Md. Shafiul Ferdous ◽  
Chobin Makabe ◽  
Masaki Fujikawa
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Carbon Steel ◽  
Cold Work ◽  
Fatigue Crack Initiation ◽  
Steel Specimen ◽  
Expansion Method ◽  
Al Alloy ◽  
2024 Aluminum Alloy ◽  
Cold Worked

The enhancement method of fatigue life and the crack initiate and growth behavior of a holed specimen was investigated by using the 2024 Aluminum alloy and 0.45% Carbon steel. The purpose of present study is to propose a simple technical method for enhancement of fatigue life in a notched specimen. Also, the effect of local plastic deformation by cold work on fatigue crack initiation behavior was examined. This paper presents a basic experimental kinematic cold expansion method by inserting and removing a pin through the specimen hole. The shape of cross-section of pin was a circle or an ellipse. It was shown that the fatigue life of the specimen with the cold-worked hole was longer than that of the specimen with non-cold-worked hole for the case of same stress level in aluminum alloy and carbon steel. Also, the fatigue strength was higher in the case of the cold expanded hole. In this study, a methodology of lengthening of fatigue life of holed specimen is shown. Also, the improvement conditions of fatigue life were significantly affected by shape of pin, local hardening and residual stress conditions. The fatigue life improvement of the damaged component of structures was studied.

Bursting of Tubular Specimens by Gaseous Detonation

1961 ◽  
Vol 83 (4) ◽  
pp. 519-527 ◽  
Author(s):  
P. N. Randall ◽  
I. Ginsburgh
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Austenitic Stainless Steel ◽  
Steel Specimen ◽  
Pressure Vessels ◽  
Gaseous Detonation ◽  
Brittle Transition ◽  
Steel Tubing ◽  
Hot Rolled ◽  
Tubular Specimens

The paper describes some experimental work designed to investigate the bursting of pipe and pressure vessels by gaseous detonation. The test specimens were 3.25-in-OD tubes, 12 in. long, and of 0.040 to 0.070-in. wall thickness. The specimens, cut from hot-rolled carbon-steel pipe, and also from drawn carbon-steel tubing, were tested at several temperatures, which were chosen to produce failures both above and below the brittle transition temperatures for the two materials. In addition, an austenitic stainless-steel specimen was tested under very severe conditions in several unsuccessful attempts to fragment it.

An improved technique of expanding metal ring experiment under high explosive loading

2013 ◽  
Vol 84 (4) ◽  
pp. 043908 ◽  
Author(s):  
Tiegang Tang ◽  
Guowu Ren ◽  
Zhaoliang Guo ◽  
Qingzhong Li
Keyword(s):  
High Explosive ◽  
Explosive Loading ◽  
Metal Ring ◽  
Improved Technique

scholarly journals Study on dynamic fragmentation of multiple metal rings under high explosive loading

2014 ◽  
Vol 500 (11) ◽  
pp. 112060
Author(s):  
Tiegang Tang ◽  
Guowu Ren ◽  
Zhaoliang Guo ◽  
Qingzhong Li
Keyword(s):  
High Explosive ◽  
Explosive Loading ◽  
Dynamic Fragmentation ◽  
Metal Rings

DESENSITIZATION OF HETEROGENEOUS HIGH EXPLOSIVES UNDER INITIATION THROUGH HIGH MODULUS ELASTIC ELEMENTS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1305-1310 ◽  
Author(s):  
I. A. BALAGANSKY ◽  
A. I. GLUMOV ◽  
A. V. SAMSONOV ◽  
A. D. MATROSOV ◽  
I. A. STADNICHENKO
Keyword(s):  
Shock Wave ◽  
Silicon Carbide ◽  
Cross Sections ◽  
High Explosive ◽  
Steel Specimen ◽  
High Modulus ◽  
Partial Overlap ◽  
Witness Plate ◽  
Ceramic Insert ◽  
Elastic Elements

We have experimentally investigated the influence of fluoroplastic, copper, and silicon carbide inert inserts on the process of detonation transmission through water. Active and passive HE charges were molded from high explosive (HE) Comp. B. The diameter and height of HE cartridges were 40 and 40 mm, respectively. On the rear end of the passive HE charge a steel witness plate was mounted, which detected presence or absence of detonation. Inert inserts were shaped as 20 mm × 20 mm square prisms of varying lengths, and were contained between active and passive HE charges without any clearance on the way of initiating shock wave with partial overlap of HE cross sections. We demonstrate that preloading a passive HE charge with a shock wave transmitted through a copper or a ceramic insert causes considerable desensitization of the Comp. B. Other conditions being the same, the crash distance of detonation transmission for copper was equal to 74%, and for silicon carbide – to 60% of the distance for fluoroplastic. This desensitization phenomenon may be used for development of protective shells for HE. While performing experiments with 20 mm ceramic inserts we have observed unknown cumulation phenomenon, which manifested itself as a hole in identification steel specimen with depth of about 10 mm.

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