Bending behaviors and fracture characteristics of laminated ductile-tough composites under different modes
Bending behaviors and fracture characteristics of laminated ductile-tough composites under different modes
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不同模式下层状延韧复合材料的弯曲行为和断裂特性
DOI：
10.1016/j.compscitech.2016.02.011
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发表时间：
2016-04-01
影响因子：
9.1
通讯作者：
Yin, F. X.
中科院分区：
文献类型：
--
作者：
Liu, B. X.;Huang, L. J.;Yin, F. X.
研究了一系列叠层Ti-（TiBw/Ti）复合材料在5种弯曲模式下的载荷-挠度曲线和断裂特征。结果表明，随着Ti层厚度的减小和TiBw体积分数的增加，合金发生了韧脆转变，这是由高应力应变和高拉应力的约束塑性变形机制引起的。弱界面层合复合材料在缺口裂纹止裂取向下表现出上级断裂韧性，这与分层裂纹和多个隧道裂纹有关。此外，在模式IV下，复合材料中出现了单裂纹和周期性多裂纹扩展，这取决于韧性Ti层和坚韧TiBw/Ti复合层的厚度和极限强度比。V型裂纹下出现了大量的分层裂纹和多个隧穿裂纹，对复合材料起到了有效的增韧作用。随着Ti层厚度的减小，层状复合材料表现出明显的尺寸效应，隧道裂纹增多。(C)2016爱思唯尔有限公司版权所有
The bending load-deflection curves and fracture characteristics of a range of laminated Ti-(TiBw/Ti) composites were investigated under five modes. The results show ductile-brittle transition with decreasing Ti layer thicknesses and increasing volume fractions of TiBw, which is attributed to the constrained plastic deformation mechanism accompanying with high stress traixiality and tensile stress. The laminated composites with weak interfaces display superior fracture toughness under notched crack arrested orientation, which is related to the delamination cracks and multiple tunnel cracks. Moreover, single tunnel crack propagation and periodic multiple tunnel cracks were observed in the laminated composites under mode IV, which depend on the thickness and ultimate strength ratio of ductile Ti layer and tough TiBw/Ti composite layer. There are many interfacial delamination cracks and multiple tunneling cracks presented under mode V, playing an effective role in toughening the laminated composites. In addition, with decreasing the Ti layer thickness, laminated composites reveal obvious size effect characterized by more tunnel cracks. (C) 2016 Elsevier Ltd. All rights reserved.