nonlinear viscoelasticity 中文意思是什麼
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The main purpose of this paper is to study crack growth rate of a class of nonlinear viscoelastic materials under the condition of constant load and small - strain. in this paper : the new test program is raised by referencing the existing test programs and by our trial and error ; in the new test program, facilities involved in the nonlinear viscoelastic crack tests are relatively few, the test process is relatively simple and the data obtained from the experiments are credible. on this basic, the calculation of j integral of nonlinear viscoelastic double cantilever beams specimens and the parameter of fracture work of corresponding nonlinear viscoelasticity are derived
具體成果包括： 1 、證實了雙懸臂梁試件用於非線性粘彈性裂紋擴展實驗研究的優點：雙懸臂梁試件在實驗中能觀測到的擴展過程持續時間比較長，在計算j積分時，計算方法簡單； 2 、得到了改性聚丙烯材料用於非線性粘彈性裂紋擴展實驗的兩種有效的試件構形和相應的試件尺寸；採用不斷改善夾具的方法使得加載穩定； 3 、經過連續四個多月的時間得到了一組有用的實驗數據； 4 、得到了裂紋長度與時間的關系、裂紋擴展速度與時間的關系、裂紋擴展速度與裂紋長度的關系。 -
Performance for a piezoresistive transducer pressure sensor to thermal and pressure environments can be predicted by finite element method. a simplified 1 / 8 model, considering silicon dioxide and nitride process as well as stack anodic bonding and adhesive bonding processes, was developed. the fem results were found to be comparable to experimental data. case studies suggested that pyrex stack induces certain amount of non - linearity, while it isolates hard epoxy nonlinear effect. flexible epoxy bonding or soft adhesive bonding is preferred to the packaging process. the viscoelasticity and viscoplasticity of bonding material will result in hysteresis and drift errors to sensor output. however, soft adhesive s influence on sensor can be ignored under relative stable environments. more over, detailed design and process information will help to improve modeling application
熱、壓環境下壓阻變換壓力傳感器的性能可以通過有限元方法預測.這里研究了簡化的1 / 8模型，模型考慮了二氧化硅和氮化硅生成過程及堆陽極鍵合和膠粘結合過程.結果發現有限元預測結果和實驗數據具有可比性.範例研究表明，硼硅堆導致產生一定的非線性，但它隔離了硬環氧樹脂的非線性.在包裝過程中最好使用柔性環氧黏合或軟黏膠性結合.黏合材料的黏彈性和黏塑性將會導致傳感器輸出的滯后和漂移誤差.然而，在相對穩定的環境下，軟黏合劑對傳感器的影響可以忽略.此外，詳細的設計和過程信息有助於提高模型的適用性 -
In this paper, we take high molecule physics and the damage theory of rheologic material with lacuna as the basic, make the experiment as a mostly measure, take the pmma as a research object, to study the pmma ' s nonlinear viscoelasticity of high polymer. the technique showing minute details in minute view measure is used by the author to observe the change of crazing damage density follow the change of stress, time and temperature in term of creep and flab
本文以高分子物理學、含缺陷流變性物體的材料破壞理論為基礎，以實驗為手段，以工程中常用的pmma為研究對象，對pmma銀紋破壞的非線性力學行為進行了研究。作者採用顯微技術，對pmma在蠕變或鬆弛條件下，不同應力水平和不同基溫下的pmma銀紋損傷進行了實驗研究。 -
The large time behaviors are studied to the initial - boundary problems of 2x2 nonlinear hyperbolic system of conservation laws with relaxation and 2x2 nonlinear system of viscoelasticity in this thesis
本文研究具有鬆弛源項的2 2非線性雙曲守恆組和2 2非線性粘彈性方程組的初邊值問題解的大時間性態。 -
High molecule physics and the damage theory of rheologic material with lacuna are used in experiments to study the pmma ' s nonlinear viscoelasticity and changing depends on time and temperature when distorting and destroying. we try to seek a common rule to polymer ' s crazing damage, offer a viable damage model and measure to research polymer ' s minute damage
本文運用高分子物理、含缺陷流變性物體的材料破壞等理論，以實驗為基礎，對聚合物變形、破壞以及時間相依和溫度依賴性等非線性力學行為進行研究，試圖尋求聚合物銀紋損傷的一般規律，為研究聚合物的細觀損傷提供了一種可行的損傷模型與方法。 -
( 2 ) using craze density dcraze (, ) to illustrate the damage degree of material, considering strain equivalent hypothesis, non - linear visco - elastic constitutive equation of pmma taken into consideration of the operation of craze damage is arrived. the pmma sheet is loaded under different forces to validate the non - linear visco - elastic constitutive equation with damage. the result shows that the theory curves obtained by the nonlinear viscoelasticity constitutive relation agrees with experimental data considerably well
（ 2 ）用銀紋密度d _ （ craze ） （ ， t ）來描述材料的損傷度d ，在考慮應變等效性假設的基礎上，得到了pmma材料考慮損傷的非線性粘彈性材料的本構關系，運用此方程對材料在不同載荷水平下進行蠕變實驗，從而對蠕變條件下的應變響應進行模擬和預報。 -
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，國內外學者在粘彈性理論研究領域取得了許多重要的研究進展，線粘彈性理論已發展得較為完善，非線性粘彈性理論由於實驗和數學上存在的困難尚處于不斷的發展和完善之中。
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