Abstract
This work deals with engineering components made of stainless steels working at high temperature and subjected to creep-fatigue loading history. The defect assessment procedures generally use the crack growth properties curve d a/d t versus C ∗ parameter for estimating the creep-crack growth. The ASTM E 1457-98 [ASTM E 1457-98. Standard test method for measurement of creep crack growth rates in metals, 1998] procedure proposes the rule to establish such a master curve. In particular, it is stipulated that this rule only applies for CT specimens. Previously [Laiarinandrasana L, Kabiri R, Drubay B. In: Gupta A, editor. Proceedings of the 16th international conference on structural mechanics in reactor technology, Washington, USA, 2001], some practical methodology to produce this crack growth curve on CT specimens has been described by introducing the way to determine the upper and lower limits of relevant experimental points and by adopting the ASTM E 1457-98 method to estimate the creep component of the load line displacement rate (d δ/d t behavior). This latter is the interesting part of the total displacement rate recorded during the test. This paper focuses on the application of the procedure proposed in [Laiarinandrasana L, Kabiri R, Drubay B. In: Gupta A, editor. Proceedings of the 16th international conference on structural mechanics in reactor technology, Washington, USA, 2001] on specimen geometries other than CT, such as circumferentially cracked round bar (CCRB) and double edged notched in tension (DENT) specimens. The d a/d t versus C ∗ curves issued from all of these specimens are compared. Discussion about the effect of geometry on these curves is carried out. Additionally, some finite element analyses have been performed in order to simulate the creep crack growth using the node release technique. These simulations allow to verify the validity of the proposed expressions of C ∗ and consequently the master curve of the 316L(N) stainless steel.
Highlights
High temperature structural components are often subjected to non-uniform stress and temperature distribution during service
An attempt is made to generalize this procedure to other specimens such as circumferentially cracked round bar (CCRB) and double edged notched in tension (DENT) specimens, in order to show the relevance of the master curve of type 316L stainless steel
This would bring a better understanding of the geometry effects once the data are analysed
Summary
High temperature structural components are often subjected to non-uniform stress and temperature distribution during service These conditions may favour localized creep damage in the form of service initiated. The ASTM E 1457-98 [1] procedure proposes the rule to establish a master curve relating the creep crack growth rate (da/dt) to the fracture mechanics load parameter C*. Throughout this paper the crack growth properties curve related to da/dt versus C* parameter will be referred to as master curve. An attempt is made to generalize this procedure to other specimens such as circumferentially cracked round bar (CCRB) and double edged notched in tension (DENT) specimens, in order to show the relevance of the master curve of type 316L stainless steel. The validation of the proposed procedure by a finite element (FE) method simulating creep crack growth with node release technique is carried out
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