preexisting crack 中文意思是什麼
preexisting crack
解釋
原有裂隙- preexisting : 預成
- crack : vt 1 使破裂；敲破，敲碎，砸碎（陶器等）；嗑（瓜子等）；【化學】裂化（石油等）。2 把（槍打得、鞭子...
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Based on a large numbers of model / simulation test of the intermittent cracked rock - like samples, fatigue strength, fatigue deformation and crack appear in preexisting cracks tips, the growth of crack, the pattern of crack coalescence are studied / analysed systemically by means of cyclic load and static load, in the course of the model test, the difference between cyclic load and static load of crack appear in preexisting cracks tips, the growth of crack and the pattern of crack coalescence are observed and analysed
在試驗過程中，觀察並分析了循環加載方式下，預置裂隙端部裂紋萌生、擴展、巖橋貫通模式與靜載方式下的差異；探討了疲勞裂紋萌生、擴展的機理，分析了加載頻率、荷載水平對裂隙試樣疲勞強度、疲勞變形（總變形和不可逆變形）的影響規律。 -
Lastly, the rule of fatigue crack appear in preexisting cracks tips is established according to the principle of maximal tensile stress using the theory fracture and damage
最後，運用斷裂損傷理論，在最大周向拉應力理論的基礎上，建立了循環加載下預置裂隙端部疲勞裂紋的起裂準則，並用試驗結果進行了驗證。
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