Crack arrest in rupturing steel gas pipelines
Source abstract
Abstract
Failure incident investigations and full-scale experiments of pipelines rupturing indicate that the original methods in predicting arrest are no longer reliable when applied to high toughness pipelines. The cause of the phenomenon is analyzed in this paper through a macroscopic and phenomenological method by referring to the energy balance equation, by that is established the iterative algorithm used in finite element method (FEM) simulation of crack deceleration. This simulation, in combination with the two-specimen drop weight tear test (DWTT), provides a broad prediction of the dynamic fracture process. In addition, the crack tip opening angle (CTOA) criterion is consummated through the comparison between CTOA in FEM calculation and the critical value of (CTOA)C obtained in the two-specimen DWTT. Thus, the avoidance of both the dimensional effect and the dissipation of irrelevant energy common in small-scale tests are achieved.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · Structural Integrity and Reliability Analysis · Non-Destructive Testing Techniques
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References (12)
Show source-provided references
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