Linear viscoelasticity stability analysis of bluff rock slope 隨機連續(xù)桿縱向振動系統(tǒng)的頻率可靠性分析
( 7 ) basing on defining damage variable with flaws in rock , this paper uses linear viscoelasticity fracture mechanics to set up a damage reep model and analyses the model ( 7 )在用巖石中大小、方位和位置均為隨機分布的裂紋定義損傷變量基礎(chǔ)上,利用線粘彈性斷裂力學原理對考慮裂紋內(nèi)水壓的巖石的損傷蠕變問題進行了建模和分析。
With engineering polymer - pmma taken as the main researched object and viscoelastic failure considered as the theory basis , the non - linear viscoelasticity and crazing damage phenomena under creep condition in macromolecule material were researched by means of experiment 本文以工程高聚物pmma為主要研究對象,以粘彈性破壞理論為基礎(chǔ),以實驗為手段,對高分子材料蠕變條件下的非線性粘彈性性能及其銀紋損傷現(xiàn)象進行了初步探討。
From the hypothesis of linear viscoelasticity , we predicted the time of life of the three specimens with edge crack which fractured in out experiment at last in view of energy releasing . however , we found that the predicted values were on the low side obviously , so we analyzed the reason of being non - linear . on this basis , we modified the method 本文的第四章從線粘彈性假設(shè)出發(fā),從能量釋放率的角度對實驗中最終斷裂的三今含邊裂紋的試件的壽命進行了預測,并與實驗結(jié)果進行了對比,發(fā)現(xiàn)預測值明顯偏低,分析了產(chǎn)生非線性的原因,進行了非線性修正。
At present , many important development on the studies of viscoelastic theory have been made by the efforts of scholars home and abroad , linear viscoelasticity theory has sufficiently developed , while nonlinear viscoelastic theory is still under developed by the reason of difficulties in experiment and mathematics 目前,國內(nèi)外學者在粘彈性理論研究領(lǐng)域取得了許多重要的研究進展,線粘彈性理論已發(fā)展得較為完善,非線性粘彈性理論由于實驗和數(shù)學上存在的困難尚處于不斷的發(fā)展和完善之中。