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Fracture properties on the adhesive interface of double cantilever beam specimens bonded with lightweight dissimilar materials at opening and sliding modes
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.compositesb.2020.108240
J.W. Kim , J.U. Cho

This study aims at investigating the fracture properties of double cantilever beam (DCB) by the combination of lightweight materials at opening and sliding modes. The specimens were prepared by referring to the British Standard of BS7991. In terms of experimental conditions, the lower part was fixed while the enforced displacement of 3 mm/min was applied to the upper part at both opening and sliding modes. As a result of the experiment, the maximum reaction forces at the opening mode and the sliding mode were seen to be highest in the order of CFRP-Al, Al–Al_Foam and CFRP-Al_Foam. At the opening mode, the maximum energy release rate was found to be in the order of Al–Al_Foam, CFRP-Al and CFRP-Al_Foam. In the sliding mode, the maximum energy release rate was found to be in the order of CFRP-Al, Al–Al_Foam and CFRP-Al_Foam. In the opening mode, the maximum reaction force of about 1.5 mm was shown at the composite specimens with CFRP. At the composite specimen with Al, it can be seen that the maximum reaction force happens at about 0.7 mm, and a rapid rise or drop takes place at this point. The brittleness at mode I is mostly likely to be the fracture property of adhesive. By considering the reaction force and energy release rate, the strain energy became relatively large among the specimens of CFRP-added combination in the sliding mode.



中文翻译:

在打开和滑动模式下,用轻质异种材料粘结的双悬臂梁试样在粘合界面上的断裂特性

这项研究旨在通过在打开和滑动模式下结合轻质材料研究双悬臂梁(DCB)的断裂特性。参照英国标准BS7991制备样品。就实验条件而言,下部是固定的,而在打开和滑动模式下,均以3 mm / min的强制位移施加到上部。实验结果表明,在打开模式和滑动模式下,最大反作用力按CFRP-Al,Al-Al_Foam和CFRP-Al_Foam的顺序最高。在打开模式下,发现最大能量释放速率约为Al–Al_Foam,CFRP-Al和CFRP-Al_Foam。在滑动模式下,发现最大能量释放速率约为CFRP-Al,Al-Al_Foam和CFRP-Al_Foam。在打开模式下 CFRP复合材料试样的最大反作用力约为1.5 mm。可以看出,在具有Al的复合材料试样上,最大反作用力发生在约0.7mm处,并且在此点发生快速的上升或下降。模式I下的脆性最可能是粘合剂的断裂特性。考虑到反作用力和能量释放速率,在滑动模式下添加CFRP的组合试样中的应变能变得相对较大。

更新日期:2020-07-03
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