粘弹性夹心夹层结构卸载后的裂纹持续扩展现象研究

发布时间：2018-06-07 04:34

本文选题：聚氨酯弹性体 + 夹层复合结构　；参考：《固体力学学报》2017年04期

【摘要】：以聚氨酯弹性体钢夹层板为研究对象,对其进行了三点弯曲实验,对不同类型试件的实验结果进行了总结.实验发现,在加载过程中,在弯曲挠度超过一定程度时,夹层板结构的角点位置出现开裂,由于层间强度不足和夹心材料的粘弹性性质,卸载后裂纹会在一段时间内沿层间继续发生扩展,最后导致整个面板发生脱粘或夹心撕裂.针对这一现象,以弹性地基梁理论为基础,计算了上下面板的挠度差异,并使用层间粘结强度来分析试件的临界状态,获得了软夹芯试件和硬夹芯试件的临界破坏的裂纹长度.结果表明,使用层间粘结强度分析方法,获得的结果都能够描述聚氨酯弹性体钢夹层板的层间延迟破坏的特点.
[Abstract]:The three-point bending test of polyurethane elastomer steel sandwich plate was carried out, and the experimental results of different types of specimens were summarized. It is found that when the bending deflection exceeds a certain degree during the loading process the corner position of sandwich plate structure cracks due to the insufficient interlaminar strength and the viscoelastic properties of the sandwich material. After unloading, the crack will continue to propagate along the interlayer for a period of time, resulting in debonding or sandwich tearing of the whole panel. In view of this phenomenon, based on the theory of elastic foundation beam, the deflection difference of upper and lower panels is calculated, and the critical state of specimens is analyzed by means of interlaminar bond strength, and the critical crack length of soft sandwich specimen and hard sandwich specimen is obtained. The results show that the results obtained by using the method of interlaminar bond strength analysis can describe the characteristics of interlaminar delay failure of polyurethane elastomer steel sandwich laminates.
【作者单位】：哈尔滨工程大学航天与建筑工程学院;沈阳发动机设计研究所强度设计室;青岛理工大学土木工程学院;
【基金】：国家自然科学基金项目(51409056) 黑龙江省自然科学基金项目(E2015047) 中央高校基本科研业务费(HEU20160202)资助
【分类号】：O346.1

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