A parametric study of residual stresses in multi-pass butt-welded stainless steel pipes
01 Jan 1998-International Journal of Pressure Vessels and Piping (Elsevier)-Vol. 75, Iss: 1, pp 11-25
TL;DR: In this paper, the through-thickness variation at the weld and heat affected zone, of the axial and hoop stresses and their sensitivity to variation in weld parameters are studied.
About: This article is published in International Journal of Pressure Vessels and Piping.The article was published on 1998-01-01. It has received 409 citations till now. The article focuses on the topics: Butt welding & Piping.
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TL;DR: Based on the ABAQUS software, uncoupled thermal-mechanical three-dimensional and two-dimensional (2-D) finite element models are developed in this article to evaluate the transient temperature and the residual stress fields during welding.
517 citations
TL;DR: In this paper, the authors present a review of the development of welding simulation and the directions for future research, which is summarized in this review, which consists of three parts: the important development of material modeling and computational efficiency are outlined in Parts 2 and 3, respectively.
Abstract: Simulation of welding has advanced from the analysis of laboratory setups to real engineering applications during the last three decades. This development is outlined and the directions for future research are summarized in this review, which consists of three parts. This part shows that the increased complexity of the models gives a better description of the engineering applications. The important development of material modeling and computational efficiency are outlined in Parts 2 and 3, respectively.
329 citations
TL;DR: In this article, a review of the development of simulation of welding has been presented and the directions for future research are summarized in this review, which consists of three parts: material modeling, material behavior, and future research directions.
Abstract: Simulation of welding has advanced from the analysis of laboratory setups to real engineering applications during the last three decades. This development is outlined and the directions for future research are summarized in this review, which consists of three parts. The material modeling is maybe the most crucial and difficult aspect of modeling welding processes. The material behavior may be very complex for the large temperature range considered.
268 citations
Cites background from "A parametric study of residual stre..."
...IMPROVED MATERIAL MODELING 221 accumulated strains when the material melts (Lindgren et al. 1997, Brickstad and Josefson 1998)....
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TL;DR: In this paper, the main emphasis is on thermal modelling and prediction of laser welding in metals, and a review is given over to the modelling of these processes where appropriate, where the time frame of the review is up to the year 2002.
Abstract: The main emphasis of this review is on thermal modelling and prediction of laser welding in metals. However as similar techniques are employed to model conventional welding processes such as arc, resistance and friction, as well as related processes such as alloying, cladding and surface hardening, part of this review is given over to the modelling of these processes where appropriate. The time frame of the review is up to the year 2002.
246 citations
TL;DR: In this article, both the experiment and the finite element method (FEM) are utilized to investigate the welding residual stress distribution in medium thick-walled austenitic stainless steel pipe.
157 citations
References
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Proceedings Article•
01 Dec 1989
TL;DR: The range of scheduling mechanisms presented herein allows this type of exibility during code generation and their use on critical portions of code could create enhanced run-time performance for a wide variety of code.
Abstract: The traveling saleman and sequence scheduling quality solution using genetic edge recombination. A study of permutation crossover operators on the traveling salesman problem. example of using pseudooelds to eliminate version shuuing in horizontal code compaction. race scheduling optimization in a retargetable microcode compiler.cessing: A smart compiler and a dumb machine.man. A vliw architecture for a trace scheduling compiler. IEEE Trans-117 considered during instruction scheduling. Using methods suggested here, this complexity m a y be reduced or bounded by a c hosen amount of time. 3. The search capabilities of genetic algorithms could be used to generate better weightings on the list scheduling algorithm. As these will vary on a per-architecture basis, a suite of typical" programs could be compiled while changing the weights in the discriminating polynomial selection function. Those weights found to produce good results for the current machineeprogram combination could then be used for any program on that machine. This would also provide feedback to the machine designers as to which features have a direct bearing upon performance and which do not. Closing the loop that exists between hardware and software design will increase the speed of both. 6.4 Summary In summary, previous methods of local instruction scheduling were examined and found lacking. Several new approaches were discovered and developed to address speciic deeciencies uncovered. A wholly new method, applying genetic algorithms, was explored and found beneecial. The increasing complexity of machines mandate the strengthing of instruction scheduling; genetic algorithms are a method of achieving this. 116 6.3 Directions With the framework provided by this work, many i n teresting directions for future work exist. Three follow. 1. Software pipelining was not considered. Its ability to improve repetitive c o d e structure is impressive. Loops are important structures to optimize as more execution time will be spent in them compared to straight line code. Previous methods have used an unrolling technique combined with local compaction SDX86, MSDP86. Because of the power of the scheduling methods developed here, their use on critical portions of code could create enhanced run-time performance for a wide variety of code. Given a choice, critical sections" of code should be emphasized in the optimization process at the expense of less critical sections of code. The range of scheduling mechanisms presented herein allows this type of exibility during code generation. For example, another parameter used to decide the type of scheduling performed on a …
935 citations
Journal Article•
705 citations
180 citations
TL;DR: In this article, a computational model is developed to calculate the magnitude and distribution of residual stresses for multipass girth-butt welded pipes, which consists of two parts, a temperature analysis model and a finite element stress analysis model.
Abstract: In this paper, a computational model is developed to calculate the magnitude and distribution of residual stresses for multipass girth-butt welded pipes. The model consists of two parts, a temperature analysis model and a finite element stress analysis model. Elastic-plastic temperature dependent mechanical properties and unloading due to stress reversals are included in the model. While computational models for predicting residual stress distributions due to one- and two-pass welds have been developed, there are certain difficulties associated with predicting the behavior of multipass welds in an economical way. An approach for handling these types of problems is described. Residual stresses obtained with the model for a seven-pass weld and a thirty-pass weld are compared with residual stresses obtained from laboratory measurements. Good agreement is found between the computed and measured values of residual stresses for for both welds.
132 citations