East China University of Science and Technology

Shanghai Turbine Company Ltd

Jianguo Gong

Fuzhen Xuan

Xia Liu

Jianping Tan

Tianye Niu

A creep strength analysis and assessment method includes comparing whether a maximum value of a local strain and a membrane strain are less than a corresponding allowable strain, and if less, determining that a component is safe; otherwise, performing the following steps: performing stress linearization on a path to obtain a local primary membrane stress Pand a local primary bending stress P; averaging shear stress components on the path to obtain an average shear stress &#x3c4;; obtaining a strength limit S, a time-independent minimum stress strength value Sand a temperature- and time-dependent stress strength limit Sfor a given material, a design lifetime and a design temperature; comparing whether P, P+Pand P+P/Kare less than S, KSand S; and comparing whether &#x3c4;is less than 0.6Sand 0.6S, and if less, the component is safe, otherwise, the component is unsafe.

Creep strength analysis and assessment method and computer device

The invention relates to a design method of high-temperature nickel-based bolts based on damage tolerance theory, comprising the following steps: S: acquiring operating parameters for the design; S: selecting a material for bolts; S: acquiring mechanical properties of the materials; S: determining a pretension stress &#x3c3;of a single bolt; S: determining the service stress &#x3c3;under the steady state; S: determining the number n, the effective cross-section area A and the distribution of bolts; S: determining a maximum allowable crack dimension; S: calculating the maximum allowable service stress &#x3c3;using the crack propagation threshold Kat the design temperature; S: comparing the service stress &#x3c3;and the maximum allowable service stress &#x3c3;, if &#x3c3;is smaller than &#x3c3;, then the bolts are safe in the design life; otherwise, return to step Sand reduce the pretension stress &#x3c3;.

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