Regulating crack propagation in laminated metal matrix composites through architectural control
Regulating crack propagation in laminated metal matrix composites through architectural control
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通过结构控制调节层压金属基复合材料中的裂纹扩展
DOI：
10.1016/j.compositesb.2019.107503
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Peng HuaXin
中科院分区：
文献类型：
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作者：
Wang Shuai;Huang Lujun;An Qi;Jiang Shan;Zhang Rui;Geng Lin;Qu ShaoXing;Peng HuaXin
为了规范层合金属基复合材料的弯曲行为，采用数值模拟和实验测试相结合的方法，研究了铺层顺序和缺口位置对复合材料弯曲行为的影响。制备了由TiB/Ti6Al4V复合层和Ti6Al4V延性层组成的层状复合材料。对最外层为合金层的试件的数值模拟结果表明，与其他堆叠顺序相比，弯曲延性更好，这一猜想也得到了弯曲应变成倍增加的实验结果的证实。这是由于相邻合金层的隧道裂纹钝化所致。对于缺口位置，无论是在合金层还是在复合层，裂纹都优先在复合层产生。如果在合金层上预刻槽，复合层中的隧道裂纹将比最外层缺口的断裂更早扩展。对于复合层中有预缺口的试件，缺口复合层的裂纹萌生后，相邻的合金层和内复合层同时断裂。通过方便地调整层叠顺序和缺口位置，可以控制层合复合材料的断裂行为。
To regulate the bending behavior of laminated metal matrix composites, the effects of stacking sequence and notch position were studied by using both numerical simulation and experimental testing. Laminated composites consisting of TiB/Ti6Al4V composite layer and Ti6Al4V ductile layer were fabricated. The results of numerical simulation on specimen with alloy layer as the outermost layer indicate a better bending ductility compared with the other stacking sequence, and this conjecture was also confirmed by the experimental result where a double increase in bending strain was observed. This was attributed to the tunneling crack blunting by adjacent alloy layers. As for the notch position, crack was preferentially to generate in the composite layer first whether the pre-notch existed in alloy layer or in composite layer. If pre-notched on the alloy layer, tunneling crack in the composite layer would extend earlier than the fracture of the notched outermost layer. For specimen with pre-notch in the composite layer, the adjacent alloy layer and the inner composite layer would fracture at the same time after the crack initiation of the notched composite layer. The fracture behavior of laminated composites can be manipulated by conveniently tailoring stacking sequences and notch position.