predictions are made in 2. Mecha 2.1 Geome Thumbnail considered notch, fatig Two speci summarize Figure 1. G A-A. Specimen 5 6 2.2 Elastic Basically, t the followi where modulus; A The materi For structu the crack g to be deter steady state s using two n Section 5 anical mo etrical desc l crack spec d in the stud gue crack an imens with ed in Table Geometry of Table 1 n No. Init at θ 2.8 3.5 city-second the time-de ing classica and de and n are ial constant ures operate growth. Wit rmined by u e ignored, t independen . odel cription cimens test dy, as shown nd creep cra h extensive 1. (a) a thumbnail 1. Test condi tial creep cr = 0º 88 50 ary creep a ependent def al elastic-sec note the der e steady-sta s employed ed under cre th regard to using FE me the crack gr nt analyses b ed at 600ºC n in Fig. 1. ack. In this creep cra crack specim tions for the rack size (m at θ 4.3 4.37 and creep f formation c condary cre rivative of s ate creep co d in FE analy eep regime, actual com ethods. The owth rate is 2 based on th C by Hyde The crack work, atten ack growth men: (a) a w thumbnail c mm) = 90º 3 7 fracture pa characteristi ep constitut A E strain and st oefficient an ysis are list C* is a prop mponents su en, with the s represente 1 he two meth [15] subjec region can ntion is main are chosen whole geome crack specim Load 9080 9070 arameter ics for 316 s tive relation n , tress corresp nd steady-s ed in Table per fracture uch as plates transition t ed in the foll 3th Internation June 1 ods respect cted to stati be divided nly paid to t n, of whic etry; (b) an e ens tested at d (N) 0 0 stainless ste n ponding to tate creep e 2 [1, 9, 15] e mechanics s and pipes, time from sm lowing form nal Conferenc 16–21, 2013, tively. The c ic loads of into three p the creep cr ch test con (b) enlarged sect t 600 ºC. Test durat 2760 1200 eel can be d time; E is th exponent re ]. s parameter , the values mall scale c m: ce on Fracture Beijing, China conclusions tension are parts: initial rack region. nditions are tion view on tion (h) escribed by (1) he Young’s espectively. to describe of C* need creep to the e a s e l . e n y s . e d e
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