Subsequent recrystallizations technique of local plastic strain in 304 stainless steel

1992 ◽  
Vol 11 (18) ◽  
pp. 1253-1256 ◽  
Author(s):  
Y. Iino
Keyword(s):  
Stainless Steel ◽  
Plastic Strain ◽  
304 Stainless Steel ◽  
Local Plastic ◽  
Local Plastic Strain

An Experimental Study on the Effect of Prior Plastic Straining on Creep Behavior of 304 Stainless Steel

1993 ◽  
Vol 115 (2) ◽  
pp. 200-203 ◽  
Author(s):  
Z. Xia ◽  
F. Ellyin
Keyword(s):  
Stainless Steel ◽  
Plastic Strain ◽  
Strain Rate ◽  
Creep Behavior ◽  
Test Procedure ◽  
Constant Strain Rate ◽  
304 Stainless Steel ◽  
Creep Model ◽  
Plastic Strain Rate ◽  
Creep Tests

Constant strain-rate plastic straining followed by creep tests were conducted to investigate the effect of prior plastic straining on the subsequent creep behavior of 304 stainless steel at room temperature. The effects of plastic strain and plastic strain-rate were delineated by a specially designed test procedure, and it is found that both factors have a strong influence on the subsequent creep deformation. A creep model combining the two factors is then developed. The predictions of the model are in good agreement with the test results.

scholarly journals Local plastic strain evolution in a high strength dual-phase steel

2010 ◽  
Vol 527 (18-19) ◽  
pp. 5026-5032 ◽  
Author(s):  
H. Ghadbeigi ◽  
C. Pinna ◽  
S. Celotto ◽  
J.R. Yates
Keyword(s):  
Plastic Strain ◽  
Dual Phase Steel ◽  
High Strength ◽  
Dual Phase ◽  
Local Plastic ◽  
Strain Evolution ◽  
Local Plastic Strain

Fatigue Life Assessment of Single Layer 60512 PVDF Barrier in Unbonded Flexible Risers

2015 ◽  
Author(s):  
Upul S. Fernando ◽  
Michelle Davidson
Keyword(s):  
Fatigue Life ◽  
Plastic Strain ◽  
Life Assessment ◽  
Dynamic Strain ◽  
Flexible Pipe ◽  
Fatigue Assessment ◽  
Local Plastic ◽  
Fatigue Life Assessment ◽  
Safety Margins ◽  
Local Plastic Strain

The polymeric barrier is one of the key components in a flexible pipe, the sound function of which is essential for the containment of the transported medium, ensuring no leakage to the environment which could result in undesired consequences. According to API 17J the barrier design must be able to sustain certain static and dynamic strain conditions however; the actual design or the fatigue assessment of the barrier is not covered within the standard. Since the barrier is subjected to the same dynamic loading as the pipe the durability and integrity of the barrier is a key issue that needs to be addressed during barrier design for dynamic risers. This paper discusses a fatigue life assessment procedure for a barrier made of copolymer Grade 60512 PVDF. A flexible pipe barrier is manufactured by continuous extrusion of polymer onto a metallic carcass. The carcass has a spiral structure with an irregular outer profile. As such, the extruded polymer on this irregular surface inevitably gives non-uniform thickness and geometric anomalies where the polymer has flowed into gaps in the carcass. During pipe loading such anomalies act as stress concentrations and become critical locations for fatigue crack formation. The evaluation of the effect of the barrier profile shape on the fatigue durability of the barrier is therefore an essential requirement, in particular, in cases where the barrier consists of a single extruded polymer layer. Within the procedure outlined in this paper, the fatigue assessment of the barrier is made using the local plastic strain behaviour. The maximum stress concentration factor and the acceptable profile for the extruded barrier are selected to provide adequate safety margins for the project specific loading conditions. A procedure has been proposed to predict the local plastic strain of the barrier using global service loading data.

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