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Research Papers: Design and Analysis

Design by Analysis: Direct Route for Cases With Pressure and Thermal Action

[+] Author and Article Information
Franz Rauscher

 Vienna University of Technology, Gusshausstrasse 30/329, A-1040 Vienna, Austriaf.rauscher+e307@tuwien.ac.at

J. Pressure Vessel Technol 130(1), 011201 (Jan 08, 2008) (9 pages) doi:10.1115/1.2826407 History: Received August 23, 2006; Revised December 18, 2006; Published January 08, 2008

This paper focuses on the usage of direct route for design by analysis, which is included in the new European standard for unfired pressure vessels (CEN, 2002, “Unfired Pressure Vessels-Part 3: Design,  ” European Committee for Standardization No. EN 13445-3, Current Issue 14-2005). The direct route addresses failure modes directly, having, therefore, advantages in comparison to the traditional method, which is stress categorization. Special attention is given to the progressive plastic deformation design check (PD-DC) with space and time-dependent temperature distribution and the fatigue design check (F-DC) with stress components, which do not vary simultaneously. As a simple demonstration example, a nozzle with cold media injection is used to show how the direct route can be applied in such cases. This example is analyzed with abruptly changing injection temperature, which makes a transient thermal analysis necessary. In the case of the PD-DC, Melan’s shakedown theorem and cycling of a finite element model with a linear-elastic ideal-plastic material model are used. In the case of the F-DC, some problems are discussed: One of them is cycle counting in the case of nonproportional loading, and the other one is the use of structural stresses and stress concentration factors.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of nozzle in sphere

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Figure 2

Operation history

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Figure 3

Temperature distribution 10s after injection (transient)

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Figure 4

Stationary temperature distribution during injection

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Figure 5

Pressure only, linear elastic analysis—Mises’ equivalent stress

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Figure 6

Pressure and thermal action 10s after injection, linear-elastic analysis—Mises’ equivalent stress

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Figure 7

Pressure and thermal action after 600s of injection, linear-elastic analysis—Mises’ equivalent stress

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Figure 8

Residual stress field—compatibility ratio (RM for 20°C)

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Figure 9

Superposition of linear-elastic stress field 10s after injection and residual stress field—compatibility ratio

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Figure 10

Accumulated plastic strain during one cycle

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Figure 11

Accumulated plastic strain during action cycle with increased actions (a) original RM and (b) reduced RM

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Figure 12

Stress versus strain cycle in Point A2

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Figure 13

Stress history at Point A2

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Figure 14

Cycle counting at Point A2

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Figure 15

Time varying stress concentration factor

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Figure 16

Stresses and cycle counting at D1

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