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

考虑了包含内盘形界面裂纹的层压板。本研究的主要目的是得出能量释放速率，这是决定界面裂纹生长状况的最重要参数。首先，我们考虑层压板受到热冲击的情况。假定恒定的热通量突然被强加在层压板的顶部表面上，例如，例如，激光加热。随着温度的升高，板通过厚度温度梯度弯曲。加热开始后任意时间t的温度分布已经知道。利用该结果并建模板的部分由两个圆盘形裂缝上方和下方的圆形板组成，因为两个曲折的圆形板在其边缘处铰接，理论上确定了层压板的挠度。发现发现盘状Delami上方的板的一部分……更多的国家会导致局部屈曲，这是由于温度梯度引起的径向压缩应力。结果表明，这种屈曲将极大地促进分层的增长，因为能量释放速率变得非常大。第二，我们考虑圆盘形界面裂纹的增长，而速度较低的影响。假定撞击是通过自由落下的刚性柱的打击来产生的，该柱子在盘状裂纹的中心正上方的板表面的点上很大。基于特征函数扩展方法，理论上在碰撞点和板的挠度上施加的集中力在撞击瞬间后确定为时间t的函数。通过将结果与实验进行比较，可以很好地确认目前的分析。能量释放速率也随时间t的函数得出。结果表明，对于静态施加载荷的情况，能量释放速率比静态施加的情况大三倍。较少的

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

Energy Release Rates for an Edge Delamination of a Laminated Beam Subjected to Thermal Gradient

热梯度作用下叠层梁边缘分层的能量释放率