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Fracture Mechanics of Interfaces of Laminates Subjected to Thermal Shock or Low Velocity Impacts

热冲击或低速冲击下层压板界面的断裂力学

基本信息

批准号：
17560073
负责人：
TOYA Masayuki
金额：
$ 1.86万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

A laminated plate containing an interior disc-shaped interface crack is considered. The main aim of the present research is to derive the energy release rates, which is the most important parameter that determines the condition of interface crack growth.First, we consider the case when a laminated plate is subjected to thermal shock. A constant heat flux is assumed to be suddenly imposed over the top surface of a laminated plate by, for example, a laser heating. As the temperature is raised, the plate is bent by the through the thickness temperature gradients. The temperature distribution at an arbitrary time t after the initiation of heating has already been known. Utilizing this result and modeling the portion of the plate consisting of the two circular plates above and below the disc-shaped crack as two lapped circular plates hinged at their rims, the deflection of the laminated plate is theoretically determined. It is found that the portion of the plate above the disc-shaped delami … More nation causes local buckling due to radial compressive stress induced by the temperature gradients. It is shown that this buckling would greatly promote the growth of delamination, since the energy release rates become very large.Second, we consider the growth of a disc-shaped interface crack by the low velocity impact. The impact is assumed to be made by the strike of a freely falling rigid column with large mass at the point of the plate surface directly above the center of the disc-shaped crack. Based on the characteristic function expansion methods, the concentrated force applied at the point of collision and the deflection of the plate are theoretically determined as functions of the time t after the instant of impact. By comparing the results with experiments, the present analyses are well confirmed. The energy release rate is also derived as a function of time t. It is shown that the energy release rate becomes about three times larger than that for the case of statically applied load. Less

考虑了含内部圆盘形界面裂纹的层合板。本研究的主要目的是推导出能量释放率，这是决定界面裂纹扩展条件的最重要的参数。首先，我们考虑层合板受到热冲击的情况。假设恒定的热通量突然施加在层压板的顶面上，例如，通过激光加热。当温度升高时，板被贯穿厚度的温度梯度弯曲。在开始加热之后的任意时间t处的温度分布已经是已知的。利用这一结果，并将盘形裂纹上方和下方的两块圆板组成的板的一部分模拟为两块在边缘处铰接的搭接圆板，从理论上确定了层合板的挠度。发现盘状脱层上方的板部分 ...更多信息由于温度梯度引起的径向压应力，Nation引起局部屈曲。结果表明，由于能量释放率变得很大，这种屈曲将极大地促进脱层的扩展。其次，我们考虑了低速冲击作用下圆盘形界面裂纹的扩展。假设撞击是由一个自由下落的大质量刚性柱在盘形裂纹中心正上方的板表面上的点处的撞击造成的。基于特征函数展开法，从理论上确定了碰撞点处的集中力和板的挠度随碰撞瞬间后时间t的变化关系。通过与实验结果的比较，本文的分析得到了很好的证实。能量释放率也被导出为时间t的函数。它示出的能量释放率变得约三倍大于静态施加载荷的情况下。少

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Local Delamination Buckling of a Laminated Beam Due to Three-Point Bending

三点弯曲引起的叠层梁局部分层屈曲

DOI：
发表时间：
2006
期刊：
Transactions of the Japan Society of Mechanical Engineers(A) Vol. 72, No.722
影响因子：
0
作者：
K.Fukagawa;M.Oda;M.Aritomi;M.Toya
通讯作者：
M.Toya

大きさの異なる二重層間はく離を有する積層円板の自由振動

具有不同尺寸双层分层的层压圆盘的自由振动