Session: DA-01-03 Design and Analysis of Pressure Vessels and Components-3

Paper Number: 123217

123217 - Pressure Vessel Design With Strain Rate Sensitive Materials: Lessons From a Refractory Material 

In pressure vessel design, understanding material toughness is critical. This challenge becomes more pronounced in designing vessels using strain rate sensitive materials due to their low toughness values determined from high strain rate tests such as impact tests. This paper focuses on the design of a pressure vessel made from pure molybdenum with toughness properties sensitive to the strain rate, due to its Body-Centered Cubic (BCC) structure[IR1] . The material is manufactured by powder metallurgy followed by hot isostatic pressing. The applied approach presented here not only unravels the intricacies of characterizing materials for the studied pressure vessel design but also presents a versatile approach that should be applicable to other strain rate sensitive materials. This paper covers the following topics:

·       Measurement of fracture toughness at different temperatures. The method of selecting criteria for the type of the tests, designing specimens, and adapting test parameters based on the intended application condition is discussed. Toughness at room temperature is measured by KIC (ASTM E399) and at elevated temperatures by JR (ASTM E1820).

·       Assessment of different non-destructive evaluation techniques to determine the most suitable methods.

·       A test plan designed to estimate the minimum detectable flaw size using the selected techniques.

·       Design of specimen geometry to measure the crack growth rates (ASTM E647). A guideline was developed to define test parameters based on the actual application parameters.

·       Finally, the lifetime of the vessel is estimated based on the above-mentioned parameters.

 [IR1]I would not write this as it suggests that all BCC materials have the same issues, which is not true.

Presenting Author: Farideh HajyAkbary ASML

Presenting Author Biography: I have an academic and industrial background in material science. Currently, I am responsible for materials used in high pressure parts at EUV Source.

Authors:

Farideh HajyAkbary ASML
Maarten Hoeijmakers ASML
Rahul Kapadia AML
Daniel Peters Structural Integrity Associates, Inc.
Ian Richardson IR Welding Consultancy
Harald Koestenbauer Plansee SE