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首頁> 外文期刊>Metallurgical and materials transactions. A, physical metallurgy and materials science >Prediction of Creep-Rupture Life of Unidirectional Titanium Matrix Composites Subjected to Transverse Loading
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Prediction of Creep-Rupture Life of Unidirectional Titanium Matrix Composites Subjected to Transverse Loading

機譯：橫向載荷作用下單向鈦基復(fù)合材料蠕變斷裂壽命的預(yù)測

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摘要

Titanium matrix composites (TMCs) incorporating unidirectional fiber reinforcement are considered as enabling materials technology for advanced engines which require high specific strength and elevated temperature capability. The resistance of unidirectional TMCs to deformation under longitudinally applied sustained loading at elevated temperatures has been well documented. Many investigators have shown that the primary weakness of the unidirectional TMC is its susceptibility to failure under very low transverse loads, especially under sustained loading. Hence, a reliable model is required to predict the creep-rupture life of TMCs subjected to different transverse stress levels over a wide range of temperatures. In this article, we propose a model to predict the creep-rupture life of unidirectional TMC subjected to transverse loading based on the creep-rupture life of unidirectional TMC subjected to transverse loading based on the creep-rupture behavior of the corresponding fiberless matrix. The model assumes that during transverse loading, the effective load-carrying matrix ligament along a row of fibers controls the creep-rupture strength and the fibers do not contribute to the creep resistance of the composite. The proposed model was verified using data obtained from different TMC fabricated using three matrix compositions, which exhibited distinctly different types of creep behavior. The results show that the creep-rupture life of the transverse TMC decreases linearly with increasing ratio of the fiber diameter to the ply thickness. The creep-rupture life is also predicted to be independent of fiber spacing along the length of the specimen.
機譯：結(jié)合了單向纖維增強的鈦基復(fù)合材料（TMC）被認為是要求高比強度和高溫能力的先進發(fā)動機的輔助材料技術(shù)。單向TMC在高溫下縱向施加的持續(xù)載荷下抵抗變形的能力已得到充分證明。許多研究人員表明，單向TMC的主要缺點是其在極低的橫向載荷下（特別是在持續(xù)載荷下）易于失效。因此，需要一個可靠的模型來預(yù)測寬溫度范圍內(nèi)承受不同橫向應(yīng)力水平的TMC的蠕變斷裂壽命。在本文中，我們提出了一個模型，該模型基于相應(yīng)的無纖維基體的蠕變斷裂行為，根據(jù)橫向載荷的單向TMC的蠕變斷裂壽命來預(yù)測其在橫向載荷下的蠕變斷裂壽命。該模型假設(shè)在橫向載荷期間，沿著一排纖維的有效承載矩陣韌帶控制蠕變斷裂強度，而纖維對復(fù)合材料的抗蠕變性沒有貢獻。使用從使用三種基質(zhì)組合物制造的不同TMC獲得的數(shù)據(jù)驗證了所提出的模型，該三種基質(zhì)組合物表現(xiàn)出明顯不同的蠕變行為類型。結(jié)果表明，橫向TMC的蠕變斷裂壽命隨著纖維直徑與層厚度的比值的增加而線性降低。還預(yù)測了蠕變斷裂壽命與沿著試樣長度的纖維間距無關(guān)。

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