本文選題：纖維增強 + 損傷檢測��； 參考：《復(fù)合材料學(xué)報》2017年01期

【摘要】：為探討單向纖維增強復(fù)合材料中纖維損傷與材料熱阻變化之間的關(guān)系,建立了由纖維斷裂引起熱阻變化的細(xì)觀理論模型,并利用該模型對熱阻變化率進(jìn)行了定性分析。針對縱向傳熱與垂直傳熱兩種情形下的熱阻進(jìn)行分析,結(jié)合Weibull纖維強度分布模型,引入纖維失效長度作為纖維鏈段的最小長度,獲得了纖維斷裂引起的復(fù)合材料縱向和沿厚度方向熱阻變化率的解析函數(shù)。采用Monte-Carlo隨機(jī)方法對外加應(yīng)力作用下復(fù)合材料熱阻隨著纖維斷裂而發(fā)生變化的過程進(jìn)行模擬。研究結(jié)果表明:無論是縱向熱阻還是厚度方向的熱阻,熱阻變化率均隨纖維斷點數(shù)目的增大而線性遞增;纖維體積組分越大,熱阻變化率越大�？v向熱阻變化率隨著纖維/基體導(dǎo)熱系數(shù)比β的增大而迅速增大,但當(dāng)β10時增大的幅度逐漸減弱;而厚度方向的熱阻變化率則隨著β的增大先急劇增大而后遞減,當(dāng)纖維與基體的導(dǎo)熱系數(shù)相當(dāng)時(在β=1附近)達(dá)到最大值。
[Abstract]:In order to study the relationship between fiber damage and thermal resistance change in unidirectional fiber reinforced composites, a meso-theoretical model of thermal resistance change caused by fiber fracture was established, and the change rate of thermal resistance was qualitatively analyzed by using the model. The thermal resistance of longitudinal heat transfer and vertical heat transfer is analyzed. According to Weibull fiber strength distribution model, fiber failure length is introduced as the minimum length of fiber chain segment. The analytical function of the variation rate of the longitudinal and thickness thermal resistance of the composites caused by fiber fracture is obtained. Monte-Carlo stochastic method is used to simulate the process of the thermal resistance of composite material changing with the fracture of fiber under the action of applied stress. The results show that both longitudinal thermal resistance and thickness direction thermal resistance increase linearly with the increase of fiber breakpoints, and the larger the fiber volume component, the greater the change rate of thermal resistance. The change rate of longitudinal thermal resistance increases rapidly with the increase of fiber / matrix thermal conductivity ratio 尾, but decreases gradually when 尾 10:00 increases, while the change rate of thermal resistance in thickness direction increases sharply first and then decreases with the increase of 尾. When the thermal conductivity of fiber and matrix is equal (near 尾 ~ (1), the maximum value is obtained.
【作者單位】： 暨南大學(xué)理工學(xué)院重大災(zāi)害與控制教育部重點實驗室;
【基金】：國家青年科學(xué)基金(11302083) 國家自然科學(xué)基金重點項目(11032005)
【分類號】：TB332

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