發(fā)布時(shí)間：2018-10-29 16:00

【摘要】：為了精確地獲得瀝青膠結(jié)料的離散松弛時(shí)間譜,提出了一種改進(jìn)開窗轉(zhuǎn)換法的線性黏彈性材料函數(shù)轉(zhuǎn)換算法.此方法可以用于離散延遲時(shí)間譜和離散松弛時(shí)間譜的相互轉(zhuǎn)換.與開窗轉(zhuǎn)換法相比,改進(jìn)開窗轉(zhuǎn)換法對(duì)于時(shí)間常數(shù)的設(shè)置更加精確,并且不會(huì)產(chǎn)生負(fù)數(shù)譜線.將改進(jìn)開窗轉(zhuǎn)換法用于一種傳統(tǒng)非改性瀝青的彎曲梁流變儀試驗(yàn)數(shù)據(jù)的離散延遲時(shí)間譜的轉(zhuǎn)換,成功地確定了相應(yīng)的離散松弛時(shí)間譜.經(jīng)有限元模型驗(yàn)證表明,此離散松弛時(shí)間譜能很好地還原該瀝青結(jié)合料的應(yīng)力松弛特性.
[Abstract]:In order to accurately obtain the discrete relaxation time spectrum of bituminous binders, an improved windowing conversion algorithm for linear viscoelastic materials was proposed. This method can be used to convert discrete delay time spectrum and discrete relaxation time spectrum. Compared with the windowing conversion method, the improved windowing conversion method is more accurate in setting the time constant and does not produce negative spectral lines. The improved windowing conversion method is applied to the conversion of the discrete delay time spectrum of the test data of a traditional unmodified asphalt bending beam rheometer, and the corresponding discrete relaxation time spectrum is determined successfully. The finite element model shows that the discrete relaxation time spectrum can well reduce the stress relaxation characteristics of the asphalt binder.
【作者單位】： 大連理工大學(xué)交通運(yùn)輸學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(50578031)
【分類號(hào)】：U414

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本文編號(hào)：2298149