時間効果を考慮したき裂進展のモデル : 三城目安山岩の場合

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"The mathematical model of crack growth given by the following equation is proposed, d(Δa) /dt = K^n/A (Δa) where Δa is the crack extention and K is the stress intensity factor. The proposed equation has been applied to the three-point-bending tests on beam specimens under the condition of a constant rate of load-point-displacement, u^^・. The results calculated showed a linear increase in K_<max> with u^^・^<1/(n+1)>. The experiments have been carried out by changing u^^・ from 10^<-6> to 10^<-1>cm/see. The experimental results also showed a linear increase in K_<max> with u^^・^<1/(37+1)>. Subsequently, the experiment has been carried out in order to determine the function A(Δa). The experimental procedure starts at loading a specimen up to K under a constant u^^・, and then the specimen is unloaded measuring the compliance (COD)/(LOAD) to calculate the crack length. By changing the level of K, a total of 28 tests have been carried out. The K-Δa curve obtained indicated a rapid increase in K at small Δa, followed by a gradual decrease in its increasing rate, and finally levelling off of K above Δa=1 cm. From this K-Δa curve, the A(Δa) was obtained and found to increase rapidly at small Δa and level off above Δa=1 cm. Through various simulations by a computer, the proposed model was found to explain the behaviour of Sanjome Andesite specimen with a crack subjected to three-point-bending under the condition of a constant u^^・ It is remained for future research to verify the equation in the cases of creep and relaxation.
社団法人日本材料学会の論文
1984-07-15

時間効果を考慮したき裂進展のモデル : 三城目安山岩の場合

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